Jak zrobić zrzut ekranu UIView?
Zastanawiam się, jak moja aplikacja na iPhone ' a może zrobić zrzut ekranu konkretnego UIView
jako UIImage
.
Próbowałem tego kodu, ale dostaję tylko pusty obrazek.
UIGraphicsBeginImageContext(CGSizeMake(320,480));
CGContextRef context = UIGraphicsGetCurrentContext();
[myUIView.layer drawInContext:context];
UIImage *screenShot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
myUIView
ma wymiary 320x480 i ma kilka widoków.
Jaki jest właściwy sposób, aby to zrobić?
15 answers
Myślę, że możesz chcieć renderInContext
, a nie drawInContext
. drawInContext jest bardziej metodą, którą można zastąpić...
Zauważ, że może nie działać we wszystkich widokach, szczególnie rok lub tak temu, gdy próbowałem użyć tego z widokiem kamery na żywo, nie działało.
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2010-02-06 23:38:00
IOS 7 ma nową metodę, która pozwala narysować hierarchię widoków w bieżącym kontekście Grafiki. To może być wykorzystane, aby uzyskać interfejs bardzo szybko.
Zaimplementowałem metodę kategorii na UIView
, aby uzyskać Widok jako UIImage
:
- (UIImage *)pb_takeSnapshot {
UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, [UIScreen mainScreen].scale);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];
// old style [self.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
Jest znacznie szybsza od istniejącej metody renderInContext:
.
Numer referencyjny: https://developer.apple.com/library/content/qa/qa1817/_index.html
Aktualizacja dla SWIFT : rozszerzenie, które wykonuje to samo:
extension UIView {
func pb_takeSnapshot() -> UIImage {
UIGraphicsBeginImageContextWithOptions(bounds.size, false, UIScreen.mainScreen().scale)
drawViewHierarchyInRect(self.bounds, afterScreenUpdates: true)
// old style: layer.renderInContext(UIGraphicsGetCurrentContext())
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
AKTUALIZACJA DLA SWIFT 3
UIGraphicsBeginImageContextWithOptions(bounds.size, false, UIScreen.main.scale)
drawHierarchy(in: self.bounds, afterScreenUpdates: true)
let image = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return image
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-06-28 14:36:33
Musisz uchwycić okno klucza , aby uzyskać zrzut ekranu lub widok interfejsu użytkownika. Możesz to zrobić w Rozdzielczości siatkówki za pomocą UIGraphicsBeginImageContextWithOptions i ustawić jego parametr skali 0.0 f. zawsze rejestruje w natywnej rozdzielczości (siatkówka dla iPhone ' a 4 i nowszych).
Ten robi zrzut ekranu pełnoekranowego (kluczowe okno)
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
CGRect rect = [keyWindow bounds];
UIGraphicsBeginImageContextWithOptions(rect.size,YES,0.0f);
CGContextRef context = UIGraphicsGetCurrentContext();
[keyWindow.layer renderInContext:context];
UIImage *capturedScreen = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Ten kod przechwytuje UIView w natywnej rozdzielczości
CGRect rect = [captureView bounds];
UIGraphicsBeginImageContextWithOptions(rect.size,YES,0.0f);
CGContextRef context = UIGraphicsGetCurrentContext();
[captureView.layer renderInContext:context];
UIImage *capturedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
To zapisuje UIImage w formacie jpg z 95% jakości w aplikacji folder dokumentów, jeśli musisz to zrobić.
NSString *imagePath = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"Documents/capturedImage.jpg"]];
[UIImageJPEGRepresentation(capturedImage, 0.95) writeToFile:imagePath atomically:YES];
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-05-15 09:57:06
IOS7 dalej, mamy poniżej domyślne metody:
- (UIView *)snapshotViewAfterScreenUpdates:(BOOL)afterUpdates
Wywołanie powyższej metody jest szybsze niż próba renderowania zawartości bieżącego widoku na obraz bitmapowy.
Jeśli chcesz zastosować efekt graficzny, taki jak rozmycie, do migawki, użyj zamiast tego metody drawViewHierarchyInRect:afterScreenUpdates:
.
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2014-01-20 09:37:26
Stworzyłem użyteczne rozszerzenie dla UIView do robienia zrzutów ekranu w języku Swift:
extension UIView{
var screenshot: UIImage{
UIGraphicsBeginImageContext(self.bounds.size);
let context = UIGraphicsGetCurrentContext();
self.layer.renderInContext(context)
let screenShot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return screenShot
}
}
Aby go użyć wystarczy wpisać:
let screenshot = view.screenshot
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2015-06-14 07:32:54
- (void)drawRect:(CGRect)rect {
UIGraphicsBeginImageContext(self.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
}
Ta metoda może umieścić w klasie kontrolera.
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2010-02-07 06:53:23
Jest nowe API z iOS 10
extension UIView {
func makeScreenshot() -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: self.bounds)
return renderer.image { (context) in
self.layer.render(in: context.cgContext)
}
}
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2018-05-01 13:31:48
CGImageRef UIGetScreenImage();
Apple pozwala nam teraz używać go w publicznej aplikacji, nawet jeśli jest to prywatne API
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2010-02-06 23:13:19
Apple nie pozwala:
CGImageRef UIGetScreenImage();
Aplikacje powinny wykonać zrzut ekranu przy użyciu metody drawRect
określonej w:
http://developer.apple.com/library/ios/#qa/qa2010/qa1703.html
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2011-12-12 09:22:00
Stworzyłem rozszerzenie do zapisywania zrzutu ekranu z UIView
extension UIView {
func saveImageFromView(path path:String) {
UIGraphicsBeginImageContextWithOptions(bounds.size, false, UIScreen.mainScreen().scale)
drawViewHierarchyInRect(bounds, afterScreenUpdates: true)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
UIImageJPEGRepresentation(image, 0.4)?.writeToFile(path, atomically: true)
}}
Call :
let pathDocuments = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true).first!
let pathImage = "\(pathDocuments)/\(user!.usuarioID.integerValue).jpg"
reportView.saveImageFromView(path: pathImage)
Jeśli chcesz utworzyć png, musisz zmienić:
UIImageJPEGRepresentation(image, 0.4)?.writeToFile(path, atomically: true)
By
UIImagePNGRepresentation(image)?.writeToFile(path, atomically: true)
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2015-09-21 01:32:41
Poniższy fragment jest używany do robienia zrzutu ekranu:
UIGraphicsBeginImageContext(self.muUIView.bounds.size);
[myUIView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenShot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Użyj metody renderInContext:
zamiast metody drawInContext:
renderInContext:
Metoda renderuje odbiornik i jego podwarstwa w bieżącym kontekście. Metoda ta
renderuje bezpośrednio z drzewa warstw.
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2014-04-28 06:58:07
Szczegóły
XCode 8.2.1, Swift 3
UIView Screen Shot in Swift
import UIKit
extension UIView {
var screenShot: UIImage? {
UIGraphicsBeginImageContextWithOptions(bounds.size, false, 1.0);
if let _ = UIGraphicsGetCurrentContext() {
drawHierarchy(in: bounds, afterScreenUpdates: true)
let screenshot = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return screenshot
}
return nil
}
}
Użycie
screenShotRenderer.image = viewForScreenShot.screenShot
Kompletny przykład użycia
Kontroler widoku z rozszerzeniem UIView
import UIKit
class ViewController: UIViewController {
@IBOutlet var viewForScreenShot: UIView!
@IBOutlet var screenShotRenderer: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
@IBAction func makeViewScreenShotButtonTapped2(_ sender: UIButton) {
screenShotRenderer.image = viewForScreenShot.screenShot
}
}
extension UIView {
var screenShot: UIImage? {
UIGraphicsBeginImageContextWithOptions(bounds.size, false, 1.0);
if let _ = UIGraphicsGetCurrentContext() {
drawHierarchy(in: bounds, afterScreenUpdates: true)
let screenshot = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return screenshot
}
return nil
}
}
Main.storyboard
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11762" systemVersion="16C67" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
<device id="retina4_7" orientation="portrait">
<adaptation id="fullscreen"/>
</device>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11757"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" customModule="stackoverflow_2214957" customModuleProvider="target" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
<viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Acg-GO-mMN">
<rect key="frame" x="67" y="28" width="240" height="128"/>
<subviews>
<textField opaque="NO" clipsSubviews="YES" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" textAlignment="natural" minimumFontSize="17" translatesAutoresizingMaskIntoConstraints="NO" id="4Fr-O3-56t">
<rect key="frame" x="72" y="49" width="96" height="30"/>
<constraints>
<constraint firstAttribute="height" constant="30" id="cLv-es-h7Q"/>
<constraint firstAttribute="width" constant="96" id="ytF-FH-gdm"/>
</constraints>
<nil key="textColor"/>
<fontDescription key="fontDescription" type="system" pointSize="14"/>
<textInputTraits key="textInputTraits"/>
</textField>
</subviews>
<color key="backgroundColor" red="0.0" green="0.47843137250000001" blue="1" alpha="0.49277611300000002" colorSpace="custom" customColorSpace="sRGB"/>
<color key="tintColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<constraints>
<constraint firstItem="4Fr-O3-56t" firstAttribute="centerX" secondItem="Acg-GO-mMN" secondAttribute="centerX" id="egj-rT-Gz5"/>
<constraint firstItem="4Fr-O3-56t" firstAttribute="centerY" secondItem="Acg-GO-mMN" secondAttribute="centerY" id="ymi-Ll-WIV"/>
</constraints>
</view>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="SQq-IE-pvj">
<rect key="frame" x="109" y="214" width="157" height="30"/>
<state key="normal" title="make view screen shot"/>
<connections>
<action selector="makeViewScreenShotButtonTapped2:" destination="BYZ-38-t0r" eventType="touchUpInside" id="KSY-ec-uvA"/>
</connections>
</button>
<imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="CEZ-Ju-Tpq">
<rect key="frame" x="67" y="269" width="240" height="128"/>
<constraints>
<constraint firstAttribute="width" constant="240" id="STo-iJ-rM4"/>
<constraint firstAttribute="height" constant="128" id="tfi-zF-zdn"/>
</constraints>
</imageView>
</subviews>
<color key="backgroundColor" red="0.95941069162436543" green="0.95941069162436543" blue="0.95941069162436543" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<constraints>
<constraint firstItem="CEZ-Ju-Tpq" firstAttribute="top" secondItem="SQq-IE-pvj" secondAttribute="bottom" constant="25" id="6x1-iB-gKF"/>
<constraint firstItem="Acg-GO-mMN" firstAttribute="leading" secondItem="CEZ-Ju-Tpq" secondAttribute="leading" id="LUp-Be-FiC"/>
<constraint firstItem="SQq-IE-pvj" firstAttribute="top" secondItem="Acg-GO-mMN" secondAttribute="bottom" constant="58" id="Qu0-YT-k9O"/>
<constraint firstItem="Acg-GO-mMN" firstAttribute="centerX" secondItem="8bC-Xf-vdC" secondAttribute="centerX" id="Qze-zd-ajY"/>
<constraint firstItem="Acg-GO-mMN" firstAttribute="trailing" secondItem="CEZ-Ju-Tpq" secondAttribute="trailing" id="b1d-sp-GHD"/>
<constraint firstItem="SQq-IE-pvj" firstAttribute="centerX" secondItem="CEZ-Ju-Tpq" secondAttribute="centerX" id="qCL-AF-Cro"/>
<constraint firstItem="Acg-GO-mMN" firstAttribute="top" secondItem="y3c-jy-aDJ" secondAttribute="bottom" constant="8" symbolic="YES" id="u5Y-eh-oSG"/>
<constraint firstItem="CEZ-Ju-Tpq" firstAttribute="centerY" secondItem="8bC-Xf-vdC" secondAttribute="centerY" id="vkx-JQ-pOF"/>
</constraints>
</view>
<connections>
<outlet property="screenShotRenderer" destination="CEZ-Ju-Tpq" id="8QB-OE-ib6"/>
<outlet property="viewForScreenShot" destination="Acg-GO-mMN" id="jgL-yn-8kk"/>
</connections>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="32.799999999999997" y="37.331334332833585"/>
</scene>
</scenes>
</document>
Wynik
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-02-10 16:13:52
-(UIImage *)convertViewToImage
{
UIGraphicsBeginImageContext(self.bounds.size);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2014-02-24 19:04:38
Możesz użyć następującej kategorii UIView -
@implementation UIView (SnapShot)
- (UIImage *)snapshotImage
{
UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, [UIScreen mainScreen].scale);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:NO];
// old style [self.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
@end
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2016-02-28 06:04:43
Swift 4 updated:
extension UIView {
var screenShot: UIImage? {
if #available(iOS 10, *) {
let renderer = UIGraphicsImageRenderer(bounds: self.bounds)
return renderer.image { (context) in
self.layer.render(in: context.cgContext)
}
} else {
UIGraphicsBeginImageContextWithOptions(bounds.size, false, 5);
if let _ = UIGraphicsGetCurrentContext() {
drawHierarchy(in: bounds, afterScreenUpdates: true)
let screenshot = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return screenshot
}
return nil
}
}
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2018-09-28 06:19:53