Tekst krzywej na istniejącym okręgu

Zaadaptowałem przykładowy projekt Apple CoreTextArcCocoa (wspomniany przez Toma H W Ta odpowiedź ) i pomyślałem, że podzielę się nim tutaj.

Dodałem również kilka innych funkcji, takich jak możliwość ustawienia rozmiaru łuku na coś mniejszego niż 180, oraz kolor tekstu i przesunięcie przesunięcia jako właściwości(dzięki czemu nie trzeba mieć dużej ramki, aby pokazać cały tekst).

 /*

 File: CoreTextArcView.m (iOS version)

 Abstract: Defines and implements the CoreTextArcView custom UIView subclass to
 draw text on a curve and illustrate best practices with CoreText.

 Based on CoreTextArcView provided by Apple for Mac OS X https://developer.apple.com/library/mac/#samplecode/CoreTextArcCocoa/Introduction/Intro.html

 Ported to iOS (& added color, arcsize features) August 2011 by Alec Vance, Juggleware LLC http://juggleware.com/

 */ 

#import <UIKit/UIKit.h>
#import <CoreText/CoreText.h>


@interface CoreTextArcView : UIView {
@private
    UIFont *            _font;
    NSString *          _string;
    CGFloat             _radius;
    UIColor *           _color;
    CGFloat             _arcSize;
    CGFloat             _shiftH, _shiftV; // horiz & vertical shift

    struct {
        unsigned int    showsGlyphBounds:1;
        unsigned int    showsLineMetrics:1;
        unsigned int    dimsSubstitutedGlyphs:1;
        unsigned int    reserved:29;
    }                   _flags;
}

@property(retain, nonatomic) UIFont *font;
@property(retain, nonatomic) NSString *text;
@property(readonly, nonatomic) NSAttributedString *attributedString;
@property(assign, nonatomic) CGFloat radius;
@property(nonatomic) BOOL showsGlyphBounds;
@property(nonatomic) BOOL showsLineMetrics;
@property(nonatomic) BOOL dimsSubstitutedGlyphs;
@property(retain, nonatomic) UIColor *color;
@property(nonatomic) CGFloat arcSize;
@property(nonatomic) CGFloat shiftH, shiftV;
@end


/*

 File: CoreTextArcView.m (iOS version)

 */ 

#import "CoreTextArcView.h"
#import <AssertMacros.h>
#import <QuartzCore/QuartzCore.h>

#define ARCVIEW_DEBUG_MODE          NO

#define ARCVIEW_DEFAULT_FONT_NAME   @"Helvetica"
#define ARCVIEW_DEFAULT_FONT_SIZE   64.0
#define ARCVIEW_DEFAULT_RADIUS      150.0
#define ARCVIEW_DEFAULT_ARC_SIZE    180.0



@implementation CoreTextArcView

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.font = [UIFont fontWithName:ARCVIEW_DEFAULT_FONT_NAME size:ARCVIEW_DEFAULT_FONT_SIZE];
        self.text = @"Curvaceous Type";
        self.radius = ARCVIEW_DEFAULT_RADIUS;
        self.showsGlyphBounds = NO;
        self.showsLineMetrics = NO;
        self.dimsSubstitutedGlyphs = NO;
        self.color = [UIColor whiteColor];
        self.arcSize = ARCVIEW_DEFAULT_ARC_SIZE;
        self.shiftH = self.shiftV = 0.0f;
    }
    return self;
}

typedef struct GlyphArcInfo {
    CGFloat         width;
    CGFloat         angle;  // in radians
} GlyphArcInfo;

static void PrepareGlyphArcInfo(CTLineRef line, CFIndex glyphCount, GlyphArcInfo *glyphArcInfo, CGFloat arcSizeRad)
{
    NSArray *runArray = (NSArray *)CTLineGetGlyphRuns(line);

    // Examine each run in the line, updating glyphOffset to track how far along the run is in terms of glyphCount.
    CFIndex glyphOffset = 0;
    for (id run in runArray) {
        CFIndex runGlyphCount = CTRunGetGlyphCount((CTRunRef)run);

        // Ask for the width of each glyph in turn.
        CFIndex runGlyphIndex = 0;
        for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) {
            glyphArcInfo[runGlyphIndex + glyphOffset].width = CTRunGetTypographicBounds((CTRunRef)run, CFRangeMake(runGlyphIndex, 1), NULL, NULL, NULL);
        }

        glyphOffset += runGlyphCount;
    }

    double lineLength = CTLineGetTypographicBounds(line, NULL, NULL, NULL);

    CGFloat prevHalfWidth = glyphArcInfo[0].width / 2.0;
    glyphArcInfo[0].angle = (prevHalfWidth / lineLength) * arcSizeRad;

    // Divide the arc into slices such that each one covers the distance from one glyph's center to the next.
    CFIndex lineGlyphIndex = 1;
    for (; lineGlyphIndex < glyphCount; lineGlyphIndex++) {
        CGFloat halfWidth = glyphArcInfo[lineGlyphIndex].width / 2.0;
        CGFloat prevCenterToCenter = prevHalfWidth + halfWidth;

        glyphArcInfo[lineGlyphIndex].angle = (prevCenterToCenter / lineLength) * arcSizeRad;

        prevHalfWidth = halfWidth;
    }
}


// ensure that redraw occurs.
-(void)setText:(NSString *)text{
    [_string release];
    _string = [text retain];

    [self setNeedsDisplay];
}

//set arc size in degrees (180 = half circle)
-(void)setArcSize:(CGFloat)degrees{
    _arcSize = degrees * M_PI/180.0;
}

//get arc size in degrees
-(CGFloat)arcSize{
    return _arcSize * 180.0/M_PI;
}

- (void)drawRect:(CGRect)rect {
    // Don't draw if we don't have a font or string
    if (self.font == NULL || self.text == NULL) 
        return;

    // Initialize the text matrix to a known value
    CGContextRef context = UIGraphicsGetCurrentContext();


    //Reset the transformation
    //Doing this means you have to reset the contentScaleFactor to 1.0
    CGAffineTransform t0 = CGContextGetCTM(context);


    CGFloat xScaleFactor = t0.a > 0 ? t0.a : -t0.a;
    CGFloat yScaleFactor = t0.d > 0 ? t0.d : -t0.d;
    t0 = CGAffineTransformInvert(t0);
    if (xScaleFactor != 1.0 || yScaleFactor != 1.0)
        t0 = CGAffineTransformScale(t0, xScaleFactor, yScaleFactor);

    CGContextConcatCTM(context, t0);

    CGContextSetTextMatrix(context, CGAffineTransformIdentity);

    if(ARCVIEW_DEBUG_MODE){
        // Draw a black background (debug)
        CGContextSetFillColorWithColor(context, [UIColor blackColor].CGColor);
        CGContextFillRect(context, self.layer.bounds);
    }

    NSAttributedString *attStr = self.attributedString;
    CFAttributedStringRef asr = (CFAttributedStringRef)attStr;
    CTLineRef line = CTLineCreateWithAttributedString(asr);
    assert(line != NULL);

    CFIndex glyphCount = CTLineGetGlyphCount(line);
    if (glyphCount == 0) {
        CFRelease(line);
        return;
    }

    GlyphArcInfo *  glyphArcInfo = (GlyphArcInfo*)calloc(glyphCount, sizeof(GlyphArcInfo));
    PrepareGlyphArcInfo(line, glyphCount, glyphArcInfo, _arcSize);

    // Move the origin from the lower left of the view nearer to its center.
    CGContextSaveGState(context);

    CGContextTranslateCTM(context, CGRectGetMidX(rect)+_shiftH, CGRectGetMidY(rect)+_shiftV - self.radius / 2.0);

    if(ARCVIEW_DEBUG_MODE){
        // Stroke the arc in red for verification.
        CGContextBeginPath(context);
        CGContextAddArc(context, 0.0, 0.0, self.radius, M_PI_2+_arcSize/2.0, M_PI_2-_arcSize/2.0, 1);
        CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
        CGContextStrokePath(context);
    }

    // Rotate the context 90 degrees counterclockwise (per 180 degrees)
    CGContextRotateCTM(context, _arcSize/2.0);

    // Now for the actual drawing. The angle offset for each glyph relative to the previous glyph has already been calculated; with that information in hand, draw those glyphs overstruck and centered over one another, making sure to rotate the context after each glyph so the glyphs are spread along a semicircular path.

    CGPoint textPosition = CGPointMake(0.0, self.radius);
    CGContextSetTextPosition(context, textPosition.x, textPosition.y);

    CFArrayRef runArray = CTLineGetGlyphRuns(line);
    CFIndex runCount = CFArrayGetCount(runArray);

    CFIndex glyphOffset = 0;
    CFIndex runIndex = 0;
    for (; runIndex < runCount; runIndex++) {
        CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex);
        CFIndex runGlyphCount = CTRunGetGlyphCount(run);
        Boolean drawSubstitutedGlyphsManually = false;
        CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName);

        // Determine if we need to draw substituted glyphs manually. Do so if the runFont is not the same as the overall font.
        if (self.dimsSubstitutedGlyphs && ![self.font isEqual:(UIFont *)runFont]) {
            drawSubstitutedGlyphsManually = true;
        }

        CFIndex runGlyphIndex = 0;
        for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) {
            CFRange glyphRange = CFRangeMake(runGlyphIndex, 1);
            CGContextRotateCTM(context, -(glyphArcInfo[runGlyphIndex + glyphOffset].angle));

            // Center this glyph by moving left by half its width.
            CGFloat glyphWidth = glyphArcInfo[runGlyphIndex + glyphOffset].width;
            CGFloat halfGlyphWidth = glyphWidth / 2.0;
            CGPoint positionForThisGlyph = CGPointMake(textPosition.x - halfGlyphWidth, textPosition.y);

            // Glyphs are positioned relative to the text position for the line, so offset text position leftwards by this glyph's width in preparation for the next glyph.
            textPosition.x -= glyphWidth;

            CGAffineTransform textMatrix = CTRunGetTextMatrix(run);
            textMatrix.tx = positionForThisGlyph.x;
            textMatrix.ty = positionForThisGlyph.y;
            CGContextSetTextMatrix(context, textMatrix);

            if (!drawSubstitutedGlyphsManually) {
                CTRunDraw(run, context, glyphRange);
            } 
            else {
                // We need to draw the glyphs manually in this case because we are effectively applying a graphics operation by setting the context fill color. Normally we would use kCTForegroundColorAttributeName, but this does not apply as we don't know the ranges for the colors in advance, and we wanted demonstrate how to manually draw.
                CGFontRef cgFont = CTFontCopyGraphicsFont(runFont, NULL);
                CGGlyph glyph;
                CGPoint position;

                CTRunGetGlyphs(run, glyphRange, &glyph);
                CTRunGetPositions(run, glyphRange, &position);

                CGContextSetFont(context, cgFont);
                CGContextSetFontSize(context, CTFontGetSize(runFont));
                CGContextSetRGBFillColor(context, 0.25, 0.25, 0.25, 0.5);
                CGContextShowGlyphsAtPositions(context, &glyph, &position, 1);

                CFRelease(cgFont);
            }

            // Draw the glyph bounds 
            if ((self.showsGlyphBounds) != 0) {
                CGRect glyphBounds = CTRunGetImageBounds(run, context, glyphRange);

                CGContextSetRGBStrokeColor(context, 0.0, 0.0, 1.0, 1.0);
                CGContextStrokeRect(context, glyphBounds);
            }
            // Draw the bounding boxes defined by the line metrics
            if ((self.showsLineMetrics) != 0) {
                CGRect lineMetrics;
                CGFloat ascent, descent;

                CTRunGetTypographicBounds(run, glyphRange, &ascent, &descent, NULL);

                // The glyph is centered around the y-axis
                lineMetrics.origin.x = -halfGlyphWidth;
                lineMetrics.origin.y = positionForThisGlyph.y - descent;
                lineMetrics.size.width = glyphWidth; 
                lineMetrics.size.height = ascent + descent;

                CGContextSetRGBStrokeColor(context, 0.0, 1.0, 0.0, 1.0);
                CGContextStrokeRect(context, lineMetrics);
            }
        }

        glyphOffset += runGlyphCount;
    }

    CGContextRestoreGState(context);

    free(glyphArcInfo);
    CFRelease(line);    



}

-(void)dealloc
{
    [_font release];
    [_string release];
    [_color release];
    [super dealloc]
}

@synthesize font = _font;
@synthesize text = _string;
@synthesize radius = _radius;
@synthesize color = _color;
@synthesize arcSize = _arcSize;
@synthesize shiftH = _shiftH;
@synthesize shiftV = _shiftV;

@dynamic attributedString;
- (NSAttributedString *)attributedString {
    // Create an attributed string with the current font and string.
    assert(self.font != nil);
    assert(self.text != nil);

    // Create our attributes...

    // font
    CTFontRef fontRef = CTFontCreateWithName((CFStringRef)self.font.fontName, self.font.pointSize, NULL);

    // color
    CGColorRef colorRef = self.color.CGColor;

    // pack it into attributes dictionary

    NSDictionary *attributesDict = [NSDictionary dictionaryWithObjectsAndKeys:
                                    (id)fontRef, (id)kCTFontAttributeName,
                                    colorRef, (id)kCTForegroundColorAttributeName,
                                    nil];
    assert(attributesDict != nil);


    // Create the attributed string
    NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:self.text attributes:attributesDict];

    CFRelease(fontRef);

    return [attrString autorelease];
}

@dynamic showsGlyphBounds;
- (BOOL)showsGlyphBounds {
    return _flags.showsGlyphBounds;
}

- (void)setShowsGlyphBounds:(BOOL)show {
    _flags.showsGlyphBounds = show ? 1 : 0;
}

@dynamic showsLineMetrics;
- (BOOL)showsLineMetrics {
    return _flags.showsLineMetrics;
}

- (void)setShowsLineMetrics:(BOOL)show {
    _flags.showsLineMetrics = show ? 1 : 0;
}

@dynamic dimsSubstitutedGlyphs;
- (BOOL)dimsSubstitutedGlyphs {
    return _flags.dimsSubstitutedGlyphs;
}

- (void)setDimsSubstitutedGlyphs:(BOOL)dim {
    _flags.dimsSubstitutedGlyphs = dim ? 1 : 0;
}

@end

Aby zaoszczędzić Ci trochę czasu, oto, co znalazłem dla CoreTextArcView, który eksponuje

- (id)initWithFrame:(CGRect)frame font:(UIFont *)font text:(NSString *)text radius:(float)radius arcSize:(float)arcSize color:(UIColor *)color;

  (x,y)<---------------     w             --------------->
      +--------------------------------------------------+
     ^|                                                  |  <--
     ||                                                  |  frame
     ||                                                  |
     ||                 VED L A BEL                      |
     ||             CU R            HE                   |
     ||           xx                   RE  x             |
      |          xx                        xxx           |
      |        xxx xx                     x   xxx        |
    h |      xxx    xx                  xxx     xx       |
      |      x       xxx         <-----------------------------
      |     xx         xx   xxxxxxx   xx           x     |  arcSize :
     ||    xx            xxx       xxx             xx    |  opening angle
     ||    x              xxx      xx               x    |  in degrees
     ||   xx                xx  xxx                 x    |
     ||   x  <---- r  ----->   x                    x    |
     ||   x                      (xc,yc)            x    |
     ||   x                             <-----------------------
     ||   x                                        xx    |  xc = x + w /2
     v+---xx--------------------------------------xx-----+  yc = y + h /2 + r /2
           xx                                    xx
            x                                   xx
            xxx                                xx
              xxx                            xxx
                xxxx                      xxxx
                   xxxxx              xxxxx
                        xxxxxxxxxxxxxxx

Jest to ważne dla r > 0 i arcsize > 0.

Zobacz przykładowy projekt Apple: CoreTextArcCocoa

Pokazuje użycie tekstu podstawowego do rysowania tekst wzdłuż łuku w kakao podanie. Jak również ta próbka jak można używać kakao panel czcionek do otrzymywania ustawień czcionek które mogą być wykorzystane przez Core Text do wybierz czcionkę używaną do rysowania.

CoreText jest również dostępny w systemie iOS, więc powinieneś BYĆ w stanie zaimplementować coś podobnego.

Wypróbowałem wspomniany wyżej projekt git, i jak powiedział ZpaceZombor , jest błąd offsetu

CGContextTranslateCTM(context, CGRectGetMidX(rect)+_shiftH, CGRectGetMidY(rect)+_shiftV - self.radius / 2.0);

Zmieniłem po prostu na

CGContextTranslateCTM(context, CGRectGetMidX(rect)+_shiftH, CGRectGetMidY(rect)+_shiftV);

Ustawiłem promień na minimalną wartość pomiędzy szerokością i wysokością widoku kontenera, więc ustawiłem rozmiar łuku na 2π .

I ' ve arbitrally changed the line

CGContextRotateCTM(context, _arcSize/2.0);

Z

CGContextRotateCTM(context, M_PI_2);

Zmieniłem metodę init na

- (id)initWithFrame:(CGRect)frame font:(UIFont *)font text:(NSString *)text color:(UIColor *)color{

    self = [super initWithFrame:frame];
    if (self) {
        self.font = font;
        self.text = text;
        self.radius = -1 * (frame.size.width > frame.size.height ? frame.size.height / 2 : frame.size.width / 2);
        _arcSize = 2* M_PI;
        self.showsGlyphBounds = NO;
        self.showsLineMetrics = NO;
        self.dimsSubstitutedGlyphs = NO;
        self.color = color;
        self.shiftH = self.shiftV = 0.0f;

    }
    return self;
}

Po wielu próbach, stworzyłem tę modyfikację do funkcja PrepareGlyphArcInfo

// this constants come from a single case ( fontSize = 22 | circle diameter = 250px | lower circle diameter 50px | 0.12f is a proportional acceptable value of 250px diameter | 0.18f is a proportional acceptable value of 50px | 0.035f is a proportional acceptable value of "big" chars
#define kReferredCharSpacing 0.12f
#define kReferredFontSize 22.f
#define kReferredMajorDiameter 250.f
#define kReferredMinorDiameter 50.f
#define kReferredMinorSpacingFix 0.18f
#define kReferredBigCharSpacingFix  0.035f

static void PrepareGlyphArcInfo(UIFont* font,CGFloat containerRadius,CTLineRef line, CFIndex glyphCount, GlyphArcInfo *glyphArcInfo, CGFloat arcSizeRad)
{
    NSArray *runArray = (NSArray *)CTLineGetGlyphRuns(line);

    CGFloat curMaxTypoWidth = 0.f;
    CGFloat curMinTypoWidth = 0.f;

    // Examine each run in the line, updating glyphOffset to track how far along the run is in terms of glyphCount.
    CFIndex glyphOffset = 0;
    for (id run in runArray) {
        CFIndex runGlyphCount = CTRunGetGlyphCount((CTRunRef)run);

            // Ask for the width of each glyph in turn.
        CFIndex runGlyphIndex = 0;
        for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) {
            glyphArcInfo[runGlyphIndex + glyphOffset].width = CTRunGetTypographicBounds((CTRunRef)run, CFRangeMake(runGlyphIndex, 1), NULL, NULL, NULL);

            if (curMaxTypoWidth < glyphArcInfo[runGlyphIndex + glyphOffset].width)
                curMaxTypoWidth = glyphArcInfo[runGlyphIndex + glyphOffset].width;

            if (curMinTypoWidth > glyphArcInfo[runGlyphIndex + glyphOffset].width || curMinTypoWidth == 0)
                curMinTypoWidth = glyphArcInfo[runGlyphIndex + glyphOffset].width;

        }

        glyphOffset += runGlyphCount;
    }

    //double lineLength = CTLineGetTypographicBounds(line, NULL, NULL, NULL);

    glyphArcInfo[0].angle = M_PI_2; // start at the bottom circle

    CFIndex lineGlyphIndex = 1;

    // based on font size. (supposing that with fontSize = 22 we could use 0.12)
    CGFloat maxCharSpacing = font.pointSize * kReferredCharSpacing / kReferredFontSize;

    // for diameter minor than referred 250
    if ((fabsf(containerRadius)*2) < kReferredMajorDiameter)
        maxCharSpacing = maxCharSpacing + kReferredMinorSpacingFix * kReferredMinorDiameter / (fabsf(containerRadius)*2);

    CGFloat startAngle = fabsf(glyphArcInfo[0].angle);
    CGFloat endAngle = startAngle;

    for (; lineGlyphIndex < glyphCount; lineGlyphIndex++) {

        CGFloat deltaWidth = curMaxTypoWidth - glyphArcInfo[lineGlyphIndex].width;

        // fix applied to large characters like uppercase letters or symbols
        CGFloat bigCharFix = (glyphArcInfo[lineGlyphIndex-1].width == curMaxTypoWidth || (glyphArcInfo[lineGlyphIndex-1].width+2) >= curMaxTypoWidth ? kReferredBigCharSpacingFix : 0 );

        glyphArcInfo[lineGlyphIndex].angle = - (maxCharSpacing * (glyphArcInfo[lineGlyphIndex].width + deltaWidth ) / curMaxTypoWidth) - bigCharFix;

        endAngle += fabsf(glyphArcInfo[lineGlyphIndex].angle);
    }

    // center text to bottom
    glyphArcInfo[0].angle = glyphArcInfo[0].angle + (endAngle - startAngle ) / 2;

}

I zmienił metodę drawRect: na

- (void)drawRect:(CGRect)rect {
    // Don't draw if we don't have a font or string
    if (self.font == NULL || self.text == NULL) 
        return;

    // Initialize the text matrix to a known value
    CGContextRef context = UIGraphicsGetCurrentContext();

    //Reset the transformation
    //Doing this means you have to reset the contentScaleFactor to 1.0
    CGAffineTransform t0 = CGContextGetCTM(context);

    CGFloat xScaleFactor = t0.a > 0 ? t0.a : -t0.a;
    CGFloat yScaleFactor = t0.d > 0 ? t0.d : -t0.d;
    t0 = CGAffineTransformInvert(t0);
    if (xScaleFactor != 1.0 || yScaleFactor != 1.0)
        t0 = CGAffineTransformScale(t0, xScaleFactor, yScaleFactor);

    CGContextConcatCTM(context, t0);

    CGContextSetTextMatrix(context, CGAffineTransformIdentity);

    NSAttributedString *attStr = self.attributedString;
    CFAttributedStringRef asr = (CFAttributedStringRef)attStr;
    CTLineRef line = CTLineCreateWithAttributedString(asr);
    assert(line != NULL);

    CFIndex glyphCount = CTLineGetGlyphCount(line);
    if (glyphCount == 0) {
        CFRelease(line);
        return;
    }

    GlyphArcInfo *  glyphArcInfo = (GlyphArcInfo*)calloc(glyphCount, sizeof(GlyphArcInfo));
    PrepareGlyphArcInfo(self.font, self.radius, line, glyphCount, glyphArcInfo, _arcSize);

    // Move the origin from the lower left of the view nearer to its center.
    CGContextSaveGState(context);

    CGContextTranslateCTM(context, CGRectGetMidX(rect)+_shiftH, CGRectGetMidY(rect)+_shiftV);

    if(ARCVIEW_DEBUG_MODE){
        // Stroke the arc in red for verification.
        CGContextBeginPath(context);
        CGContextAddArc(context, 0.0, 0.0, self.radius, M_PI_2+_arcSize/2.0, M_PI_2-_arcSize/2.0, 1);
        CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
        CGContextStrokePath(context);
    }

    // Rotate the context 90 degrees counterclockwise (per 180 degrees)
    CGContextRotateCTM(context, M_PI_2);

    // Now for the actual drawing. The angle offset for each glyph relative to the previous glyph has already been calculated; with that information in hand, draw those glyphs overstruck and centered over one another, making sure to rotate the context after each glyph so the glyphs are spread along a semicircular path.

    CGPoint textPosition = CGPointMake(0.0, self.radius);
    CGContextSetTextPosition(context, textPosition.x, textPosition.y);

    CFArrayRef runArray = CTLineGetGlyphRuns(line);
    CFIndex runCount = CFArrayGetCount(runArray);

    CFIndex glyphOffset = 0;
    CFIndex runIndex = 0;
    for (; runIndex < runCount; runIndex++) {
        CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex);
        CFIndex runGlyphCount = CTRunGetGlyphCount(run);
        Boolean drawSubstitutedGlyphsManually = false;
        CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName);

        // Determine if we need to draw substituted glyphs manually. Do so if the runFont is not the same as the overall font.
        if (self.dimsSubstitutedGlyphs && ![self.font isEqual:(UIFont *)runFont]) {
            drawSubstitutedGlyphsManually = true;
        }

        CFIndex runGlyphIndex = 0;
        for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) {
            CFRange glyphRange = CFRangeMake(runGlyphIndex, 1);
            CGContextRotateCTM(context, -(glyphArcInfo[runGlyphIndex + glyphOffset].angle));

            // Center this glyph by moving left by half its width.
            CGFloat glyphWidth = glyphArcInfo[runGlyphIndex + glyphOffset].width;
            CGFloat halfGlyphWidth = glyphWidth / 2.0;
            CGPoint positionForThisGlyph = CGPointMake(textPosition.x - halfGlyphWidth, textPosition.y);

            // Glyphs are positioned relative to the text position for the line, so offset text position leftwards by this glyph's width in preparation for the next glyph.
            textPosition.x -= glyphWidth;

            CGAffineTransform textMatrix = CTRunGetTextMatrix(run);
            textMatrix.tx = positionForThisGlyph.x;
            textMatrix.ty = positionForThisGlyph.y;
            CGContextSetTextMatrix(context, textMatrix);

            CTRunDraw(run, context, glyphRange);
        }

        glyphOffset += runGlyphCount;
    }

    CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor);
    CGContextSetAlpha(context,0.0);
    CGContextFillRect(context, rect);

    CGContextRestoreGState(context);

    free(glyphArcInfo);
    CFRelease(line);    

}

Jak widać użyłem naprawdę kiepskiej metody do obliczania przestrzeni między poszczególnymi rysunkami(w oryginalnym przykładzie przestrzeń między znakami jest również oparta na rozmiarze łuku). W każdym razie wygląda na to, że działa prawie dobrze.

Najlepszym rozwiązaniem może być zakrzywienie prostokąta (czyli liniowego tekstu), z wysiłkiem graficznym i mniej dziwnymi obliczeniami.

This is what i ' ve uzyskane

Hope it helps

To jest moja metoda rysowania zakrzywionych przypisanych ciągów na warstwach, pod określonym kątem (w radianach):

[self drawCurvedStringOnLayer:self.layer withAttributedText:incident atAngle:angle withRadius:300];

Łańcuch jest również automatycznie odwrócony na dolnym obszarze łuku.

- (void)drawCurvedStringOnLayer:(CALayer *)layer
             withAttributedText:(NSAttributedString *)text
                        atAngle:(float)angle
                     withRadius:(float)radius {

    // angle in radians

    CGSize textSize = CGRectIntegral([text boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX)
                                                        options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
                                                        context:nil]).size;

    float perimeter = 2 * M_PI * radius;
    float textAngle = (textSize.width / perimeter * 2 * M_PI); 

    float textRotation;
    float textDirection;
    if (angle > degreesToRadians(10) && angle < degreesToRadians(170)) {
        //bottom string
        textRotation = 0.5 * M_PI ;
        textDirection = - 2 * M_PI;
        angle += textAngle / 2;
    } else {
        //top string
        textRotation = 1.5 * M_PI ;
        textDirection = 2 * M_PI;
        angle -= textAngle / 2;
    }

    for (int c = 0; c < text.length; c++) {
        NSRange range = {c, 1};
        NSAttributedString* letter = [text attributedSubstringFromRange:range];
        CGSize charSize = CGRectIntegral([letter boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX)
                                                              options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
                                                              context:nil]).size;

        float letterAngle = ( (charSize.width / perimeter) * textDirection );

        float x = radius * cos(angle + (letterAngle/2));
        float y = radius * sin(angle + (letterAngle/2));

        CATextLayer *singleChar = [self drawTextOnLayer:layer
                                           withText:letter
                                              frame:CGRectMake(layer.frame.size.width/2 - charSize.width/2 + x,
                                                               layer.frame.size.height/2 - charSize.height/2 + y,
                                                               charSize.width, charSize.height)
                                            bgColor:nil
                                            opacity:1];

        singleChar.transform = CATransform3DMakeAffineTransform( CGAffineTransformMakeRotation(angle - textRotation) );

        angle += letterAngle;
    }
}


- (CATextLayer *)drawTextOnLayer:(CALayer *)layer
                        withText:(NSAttributedString *)text
                           frame:(CGRect)frame
                         bgColor:(UIColor *)bgColor
                         opacity:(float)opacity {

    CATextLayer *textLayer = [[CATextLayer alloc] init];
    [textLayer setFrame:frame];
    [textLayer setString:text];
    [textLayer setAlignmentMode:kCAAlignmentCenter];
    [textLayer setBackgroundColor:bgColor.CGColor];
    [textLayer setContentsScale:[UIScreen mainScreen].scale];
    [textLayer setOpacity:opacity];
    [layer addSublayer:textLayer];
    return textLayer;
}


/** Degrees to Radian **/
#define degreesToRadians(degrees) (( degrees ) / 180.0 * M_PI )

/** Radians to Degrees **/
#define radiansToDegrees(radians) (( radians ) * ( 180.0 / M_PI ) )

Rozwiązanie Juggleware działa świetnie, nie mogę jednak znaleźć sposobu, aby zmienić kierunek, tzn. jak przejść do przesunięcia łuku z ruchu wskazówek zegara do przeciwnie do ruchu wskazówek zegara?

Update: po kilku dniach zmagania się z nadmiernie skomplikowanym kodem w tym przykładzie, postanowiłem rzucić swój własny. Wybrałem podejście deklaratywne, używając Katextlayerów, które są umieszczane na okręgu i obracane indywidualnie. W ten sposób rezultaty były znacznie prostsze do osiągnięcia. Oto kod podstawowy dla Ty:

-(void)layoutSublayersOfLayer:(CALayer*)layer
{
    if ( layer != self.layer )
    {
        return;
    }

    self.layer.sublayers = nil;

    LOG( @"Laying out sublayers..." );

    CGFloat xcenter = self.frame.size.width / 2;
    CGFloat ycenter = self.frame.size.height / 2;

    float angle = arcStart;
    float angleStep = arcSize / [self.text length];

    for ( NSUInteger i = 0; i < [self.text length]; ++i )
    {
        NSRange range = { .location = i, .length = 1 };
        NSString* c = [self.text substringWithRange:range];

        CGFloat yoffset = sin( DEGREES_TO_RADIANS(angle) ) * radius;
        CGFloat xoffset = cos( DEGREES_TO_RADIANS(angle) ) * radius;

        CGFloat rotAngle = 90 - angle;

        if ( clockwise )
        {
            yoffset = -yoffset;
            rotAngle = -90 + angle;
        }

        CATextLayer* tl = [[CATextLayer alloc] init];
        if ( debugMode )
        {
            tl.borderWidth = 1;
            tl.cornerRadius = 3;
            tl.borderColor = [UIColor whiteColor].CGColor;
        }
        tl.frame = CGRectMake( shiftH + xcenter - xoffset, shiftV + ycenter + yoffset, 20, 20 );
        tl.font = self.font.fontName;
        tl.fontSize = self.font.pointSize;
        tl.foregroundColor = self.color.CGColor;
        tl.string = c;
        tl.alignmentMode = @"center";

        tl.transform = CATransform3DMakeAffineTransform( CGAffineTransformMakeRotation( DEGREES_TO_RADIANS(rotAngle) ) );

        if ( debugMode )
        {
            CATextLayer* debugLayer = [self debugLayerWithText:[NSString stringWithFormat:@"%u: %.0f°", i, angle]];
            debugLayer.transform = CATransform3DMakeAffineTransform( CGAffineTransformMakeRotation( DEGREES_TO_RADIANS(-rotAngle) ) );
            [tl addSublayer:debugLayer];
        }        
        [self.layer addSublayer:tl];

        angle += angleStep;
    }
}

Możesz pobrać przykładowy projekt, który używa CoreTextArcView: https://github.com/javenisme/CurvaView

Weź Obwód wewnętrznego kręgu. To jest okrąg, na którym ma być renderowana baza znaków. Nazywamy ten obwód totalLength.

Zakładam, że masz listę łańcuchów do renderowania wokół okręgu w textItems.

Weź szerokość każdego ciągu do tablicy textWidths i rozłóż je równomiernie na totalLength, Być może tak jak ten pseudo (pythonish) kod:

block = max(textWidths)
assert(block * len(textWidths) <= totalLength)
offsets = [(block * i) + ((block-width) / 2) for i, width in enumerate(textWidths)]

Chociaż lepsze layouty można bez wątpienia zrobić w przypadkach, w których trigger, wszystko, co naprawdę się liczy, to to, że wiemy, gdzie poszczególne słowa zaczynają się i kończą w znanym obszarze. Aby renderować w linii prostej o długości totalLength, po prostu rozpoczynamy renderowanie każdego bloku tekstu w offsets[i].

Aby umieścić go na okręgu, odwzorujemy tę linię prostą z powrotem na obwód. Aby to zrobić, musimy odwzorować każdy piksel wzdłuż tej linii na pozycję na okręgu i pod kątem. Funkcja ta zamienia przesunięcie wzdłuż tej linii na kąt (przyjmuje wartości z zakresu 0 do totalLength)

def offsetToAngle(pixel):
    ratio = pixel / totalLength
    angle = math.pi * 2 * ratio # cool kids use radians.
    return angle

To Twój kąt. Aby uzyskać pozycję:

def angleToPosition(angle, characterWidth):
    xNorm = math.sin(angle + circleRotation)
    yNorm = math.cos(angle + circleRotation)

    halfCWidth = characterWidth / 2
    x = xNorm * radius + yNorm * halfCWidth # +y = tangent
    y = yNorm * radius - xNorm * halfCWidth # -x = tangent again.

    # translate to the circle centre
    x += circleCentre.x
    y += circleCentre.y

    return x,y

jest to ważne: zakładam również, że obrót tekstu odbywa się wokół lewego dolnego rogu glifu. Jeśli nie, to sprawy będą wyglądać trochę dziwnie. Będzie to bardziej zauważalne przy większych rozmiarach czcionek. Zawsze jest sposób, aby zrekompensować, gdziekolwiek się obraca, i zazwyczaj jest sposób, aby powiedzieć systemowi, gdzie chcesz, aby początek rotacji był (to będzie związane z wywołaniem CGContextTranslateCTM w Twoim kodzie, wyobrażam sobie) trzeba zrobić mały eksperyment, aby postacie rysujące w jednym punkcie obracające się wokół ich lewego dolnego rogu.

circleRotation jest tylko przesunięciem, dzięki czemu można obracać cały okrąg, zamiast mieć rzeczy zawsze w tej samej orientacji. To też jest w radianach.

Więc teraz dla każdego znaku w każdym bloku tekstu:

for text, offset in zip(textItems, offsets):
    pix = offset # start each block at the offset we calculated earlier.
    for c in text:
        cWidth = measureGlyph(c)
        # choose the circumference location of the middle of the character
        # this is to match with the tangent calculation of tangentToOffset
        angle = offsetToAngle(pix + cWidth / 2)
        x,y = angleToPosition(angle, cWidth)
        drawGlyph(c, x, y, angle)

        pix += cWidth # start of next character in circumference space

W każdym razie taki jest koncept.

Odnosi się do odpowiedź Ali Seyman :

Możesz pobrać przykładowy projekt, który używa CoreTextArcView: https://github.com/javenisme/CurvaView

Dodaj tę metodę, aby zmniejszyć rozmiar ramki widoku, tak jak UILabel.

- (void)sizeToFit{
[super sizeToFit];

CGFloat width = ceilf( fabsf((self.radius*2)) + self.font.lineHeight) + 3.0;
CGRect f = self.frame;
f.size = CGSizeMake(width,width);
self.frame = f;
[self setNeedsDisplay];
}

Jeśli ktoś może poprawić na zmniejszenie wysokości, jak również, zapraszamy do dodawania.

#import <Cocoa/Cocoa.h>

@interface CircleTextCell : NSCell {

}

@end

#import "CircleTextCell.h"

#define PI (3.141592653589793)

@implementation CircleTextCell

- (void)drawWithFrame: (NSRect)cellFrame inView: (NSView*)controlView
{
    NSAttributedString *str = [self attributedStringValue];
    NSSize stringSize = [str size];
    NSUInteger chars = [[str string] length];
    CGFloat radius = (stringSize.width + 5 * chars) / (2 * PI);
    CGFloat diameter = 2*radius;
    NSPoint scale = {1,1};
    if (diameter > cellFrame.size.width)
    {
        scale.x = cellFrame.size.width / diameter;
    }
    if (diameter > cellFrame.size.height)
    {
        scale.y = cellFrame.size.height / diameter;
    }
    NSAffineTransform *transform = [NSAffineTransform transform];
    NSAffineTransformStruct identity = [transform transformStruct];
    [transform scaleXBy: scale.x yBy: scale.y];
    [transform translateXBy: radius yBy: 0];
    [NSGraphicsContext saveGraphicsState];

    [transform concat];

    NSPoint origin = {0,0};
    CGFloat angleScale = 360 / (stringSize.width + (5 * chars));
    for (NSUInteger i=0 ; i<chars ; i++)
    {
        NSAttributedString *substr = 
            [str attributedSubstringFromRange: NSMakeRange(i, 1)];
        [substr drawAtPoint: origin];
        [transform setTransformStruct: identity];
        CGFloat displacement = [substr size].width + 5;
        [transform translateXBy: displacement yBy: 0];
        [transform rotateByDegrees: angleScale * displacement];
        [transform concat];
    }
    [NSGraphicsContext restoreGraphicsState];
}
@end

#import <Cocoa/Cocoa.h>

@class CircleTextCell;
@interface CircleTextView : NSView {
    CircleTextCell *cell;
}

@end

#import "CircleTextView.h"
#import "CircleTextCell.h"

@implementation CircleTextView
- (void)awakeFromNib
{
    NSDictionary *attributes = 
        [NSDictionary dictionaryWithObject: [NSFont fontWithName: @"Zapfino"
                                                            size:32]
                                    forKey: NSFontAttributeName];
    NSAttributedString *str =
        [[NSAttributedString alloc] initWithString: @"Hello World!  This is a very long text string that will be wrapped into a circle by a cell drawn in a custom view"
                                        attributes: attributes];
    cell = [[CircleTextCell alloc] init];
    [cell setAttributedStringValue: str];
}
- (void)drawRect:(NSRect)rect 
{
    [[NSColor whiteColor] setFill];
    [NSBezierPath fillRect: rect];
    [cell drawWithFrame: [self bounds] inView: self];
}

@end

to jest najlepszy url https://github.com/javenisme/CurvaView aby ustawić krzywe tekstu:

Ale zgodnie z krzywą stopnia mądrego po prostu zaktualizuję trochę kod i możemy ustawić krzywą jako stopień mądry . 45,60,90 180,360.

Spójrz na kod: https://github.com/tikamsingh/CurveTextWithAngle

Możesz wziąć jakiś pomysł.