Jak zmienić rozmiar interfejsu użytkownika, aby zmniejszyć rozmiar przesłanego obrazu
Szukałem w google i natknąłem się tylko na biblioteki, które albo zmniejszają wysokość/szerokość, albo edytują wygląd UIImage za pomocą CoreImage. Ale nie widziałem ani nie znalazłem jednej biblioteki, post, który wyjaśnia, jak zmniejszyć rozmiar obrazu, więc po przesłaniu nie jest to Pełny rozmiar obrazu.
Póki co mam to:
if image != nil {
//let data = NSData(data: UIImagePNGRepresentation(image))
let data = UIImagePNGRepresentation(image)
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"image\"; filename=\"randomName\"\r\n")
body.appendString("Content-Type: image/png\r\n\r\n")
body.appendData(data)
body.appendString("\r\n")
}
I wysyła 12MB zdjęć. Jak mogę zredukować to do 1mb? dzięki!
8 answers
Xcode 8.2.1 * Swift 3.0.2
extension UIImage {
func resized(withPercentage percentage: CGFloat) -> UIImage? {
let canvasSize = CGSize(width: size.width * percentage, height: size.height * percentage)
UIGraphicsBeginImageContextWithOptions(canvasSize, false, scale)
defer { UIGraphicsEndImageContext() }
draw(in: CGRect(origin: .zero, size: canvasSize))
return UIGraphicsGetImageFromCurrentImageContext()
}
func resized(toWidth width: CGFloat) -> UIImage? {
let canvasSize = CGSize(width: width, height: CGFloat(ceil(width/size.width * size.height)))
UIGraphicsBeginImageContextWithOptions(canvasSize, false, scale)
defer { UIGraphicsEndImageContext() }
draw(in: CGRect(origin: .zero, size: canvasSize))
return UIGraphicsGetImageFromCurrentImageContext()
}
}
Użycie:
let myPicture = UIImage(data: try! Data(contentsOf: URL(string:"http://i.stack.imgur.com/Xs4RX.jpg")!))!
let myThumb1 = myPicture.resized(withPercentage: 0.1)
let myThumb2 = myPicture.resized(toWidth: 72.0)
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2017-02-06 02:33:11
W ten sposób zmieniłem Rozmiar obrazu.
-(UIImage *)resizeImage:(UIImage *)image
{
float actualHeight = image.size.height;
float actualWidth = image.size.width;
float maxHeight = 300.0;
float maxWidth = 400.0;
float imgRatio = actualWidth/actualHeight;
float maxRatio = maxWidth/maxHeight;
float compressionQuality = 0.5;//50 percent compression
if (actualHeight > maxHeight || actualWidth > maxWidth)
{
if(imgRatio < maxRatio)
{
//adjust width according to maxHeight
imgRatio = maxHeight / actualHeight;
actualWidth = imgRatio * actualWidth;
actualHeight = maxHeight;
}
else if(imgRatio > maxRatio)
{
//adjust height according to maxWidth
imgRatio = maxWidth / actualWidth;
actualHeight = imgRatio * actualHeight;
actualWidth = maxWidth;
}
else
{
actualHeight = maxHeight;
actualWidth = maxWidth;
}
}
CGRect rect = CGRectMake(0.0, 0.0, actualWidth, actualHeight);
UIGraphicsBeginImageContext(rect.size);
[image drawInRect:rect];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
NSData *imageData = UIImageJPEGRepresentation(img, compressionQuality);
UIGraphicsEndImageContext();
return [UIImage imageWithData:imageData];
}
Przy użyciu tej metody mój obraz o 6,5 MB zmniejszył się do 104 KB.
Kod Swift 4:
func resize(_ image: UIImage) -> UIImage {
var actualHeight = Float(image.size.height)
var actualWidth = Float(image.size.width)
let maxHeight: Float = 300.0
let maxWidth: Float = 400.0
var imgRatio: Float = actualWidth / actualHeight
let maxRatio: Float = maxWidth / maxHeight
let compressionQuality: Float = 0.5
//50 percent compression
if actualHeight > maxHeight || actualWidth > maxWidth {
if imgRatio < maxRatio {
//adjust width according to maxHeight
imgRatio = maxHeight / actualHeight
actualWidth = imgRatio * actualWidth
actualHeight = maxHeight
}
else if imgRatio > maxRatio {
//adjust height according to maxWidth
imgRatio = maxWidth / actualWidth
actualHeight = imgRatio * actualHeight
actualWidth = maxWidth
}
else {
actualHeight = maxHeight
actualWidth = maxWidth
}
}
let rect = CGRect(x: 0.0, y: 0.0, width: CGFloat(actualWidth), height: CGFloat(actualHeight))
UIGraphicsBeginImageContext(rect.size)
image.draw(in: rect)
let img = UIGraphicsGetImageFromCurrentImageContext()
let imageData = UIImageJPEGRepresentation(img!, CGFloat(compressionQuality))
UIGraphicsEndImageContext()
return UIImage(data: imageData!) ?? UIImage()
}
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2018-04-30 04:47:26
W przypadku, gdy ktoś szuka zmiany rozmiaruna mniej niż 1MBza pomocą Swift 3 i 4.
Po Prostu Skopiuj i wklej to rozszerzenie:
extension UIImage {
func resized(withPercentage percentage: CGFloat) -> UIImage? {
let canvasSize = CGSize(width: size.width * percentage, height: size.height * percentage)
UIGraphicsBeginImageContextWithOptions(canvasSize, false, scale)
defer { UIGraphicsEndImageContext() }
draw(in: CGRect(origin: .zero, size: canvasSize))
return UIGraphicsGetImageFromCurrentImageContext()
}
func resizedTo1MB() -> UIImage? {
guard let imageData = UIImagePNGRepresentation(self) else { return nil }
var resizingImage = self
var imageSizeKB = Double(imageData.count) / 1000.0 // ! Or devide for 1024 if you need KB but not kB
while imageSizeKB > 1000 { // ! Or use 1024 if you need KB but not kB
guard let resizedImage = resizingImage.resized(withPercentage: 0.9),
let imageData = UIImagePNGRepresentation(resizedImage)
else { return nil }
resizingImage = resizedImage
imageSizeKB = Double(imageData.count) / 1000.0 // ! Or devide for 1024 if you need KB but not kB
}
return resizingImage
}
}
I użycie:
let resizedImage = originalImage.resizedTo1MB()
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2017-11-15 21:55:29
To samo co Leo Answer ale małe edycje dla SWIFT 2.0
extension UIImage {
func resizeWithPercentage(percentage: CGFloat) -> UIImage? {
let imageView = UIImageView(frame: CGRect(origin: .zero, size: CGSize(width: size.width * percentage, height: size.height * percentage)))
imageView.contentMode = .ScaleAspectFit
imageView.image = self
UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, scale)
guard let context = UIGraphicsGetCurrentContext() else { return nil }
imageView.layer.renderInContext(context)
guard let result = UIGraphicsGetImageFromCurrentImageContext() else { return nil }
UIGraphicsEndImageContext()
return result
}
func resizeWithWidth(width: CGFloat) -> UIImage? {
let imageView = UIImageView(frame: CGRect(origin: .zero, size: CGSize(width: width, height: CGFloat(ceil(width/size.width * size.height)))))
imageView.contentMode = .ScaleAspectFit
imageView.image = self
UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, scale)
guard let context = UIGraphicsGetCurrentContext() else { return nil }
imageView.layer.renderInContext(context)
guard let result = UIGraphicsGetImageFromCurrentImageContext() else { return nil }
UIGraphicsEndImageContext()
return result
}
}
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2017-10-26 08:41:15
Oto odpowiedź user4261201, ale w swifcie, którego obecnie używam:
func compressImage (_ image: UIImage) -> UIImage {
let actualHeight:CGFloat = image.size.height
let actualWidth:CGFloat = image.size.width
let imgRatio:CGFloat = actualWidth/actualHeight
let maxWidth:CGFloat = 1024.0
let resizedHeight:CGFloat = maxWidth/imgRatio
let compressionQuality:CGFloat = 0.5
let rect:CGRect = CGRect(x: 0, y: 0, width: maxWidth, height: resizedHeight)
UIGraphicsBeginImageContext(rect.size)
image.draw(in: rect)
let img: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
let imageData:Data = UIImageJPEGRepresentation(img, compressionQuality)!
UIGraphicsEndImageContext()
return UIImage(data: imageData)!
}
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2017-03-23 17:27:24
Jeśli przesyłasz obraz w formacie NSData
, Użyj tego :
NSData *imageData = UIImageJPEGRepresentation(yourImage, floatValue);
yourImage
jest Twoim UIImage
.
floatvalue
jest wartością kompresji(0,0 do 1,0)
Powyżej jest konwersja obrazu do JPEG
.
Dla PNG
użycie: UIImagePNGRepresentation
Uwaga: powyższy kod znajduje się w Objective-C. Sprawdź jak zdefiniować NSData w języku Swift.
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2015-03-19 05:49:26
To jest to, co zrobiłem w swift 3 do zmiany rozmiaru interfejsu. Zmniejsza rozmiar obrazu do mniej niż 100KB. Działa proporcjonalnie!
extension UIImage {
class func scaleImageWithDivisor(img: UIImage, divisor: CGFloat) -> UIImage {
let size = CGSize(width: img.size.width/divisor, height: img.size.height/divisor)
UIGraphicsBeginImageContext(size)
img.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return scaledImage!
}
}
Użycie:
let scaledImage = UIImage.scaleImageWithDivisor(img: capturedImage!, divisor: 3)
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2017-11-06 09:47:56
Zmień rozmiar interfejsu Użytkownika za pomocą .resizeToMaximumBytes
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2017-10-25 19:44:49