Я преобразовал код в Ответ Аноми здесь (скопированный выше с помощью suvish valsan) в Swift :
func fixOrientation() -> UIImage {
if self.imageOrientation == UIImageOrientation.Up {
return self
}
var transform = CGAffineTransformIdentity
switch self.imageOrientation {
case .Down, .DownMirrored:
transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI));
case .Left, .LeftMirrored:
transform = CGAffineTransformTranslate(transform, self.size.width, 0);
transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2));
case .Right, .RightMirrored:
transform = CGAffineTransformTranslate(transform, 0, self.size.height);
transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2));
case .Up, .UpMirrored:
break
}
switch self.imageOrientation {
case .UpMirrored, .DownMirrored:
transform = CGAffineTransformTranslate(transform, self.size.width, 0)
transform = CGAffineTransformScale(transform, -1, 1)
case .LeftMirrored, .RightMirrored:
transform = CGAffineTransformTranslate(transform, self.size.height, 0)
transform = CGAffineTransformScale(transform, -1, 1);
default:
break;
}
// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
let ctx = CGBitmapContextCreate(
nil,
Int(self.size.width),
Int(self.size.height),
CGImageGetBitsPerComponent(self.CGImage),
0,
CGImageGetColorSpace(self.CGImage),
UInt32(CGImageGetBitmapInfo(self.CGImage).rawValue)
)
CGContextConcatCTM(ctx, transform);
switch self.imageOrientation {
case .Left, .LeftMirrored, .Right, .RightMirrored:
// Grr...
CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.height,self.size.width), self.CGImage);
default:
CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.width,self.size.height), self.CGImage);
break;
}
// And now we just create a new UIImage from the drawing context
let cgimg = CGBitmapContextCreateImage(ctx)
let img = UIImage(CGImage: cgimg!)
return img;
}
(я заменил все вхождения параметра image на self, потому что мой код является расширением UIImage).
РЕДАКТИРОВАТЬ: Версия Swift 3.
Метод возвращает необязательный параметр, поскольку многие промежуточные вызовы могут завершиться ошибкой, и я не люблю использовать !.
func fixOrientation() -> UIImage? {
guard let cgImage = self.cgImage else {
return nil
}
if self.imageOrientation == UIImageOrientation.up {
return self
}
let width = self.size.width
let height = self.size.height
var transform = CGAffineTransform.identity
switch self.imageOrientation {
case .down, .downMirrored:
transform = transform.translatedBy(x: width, y: height)
transform = transform.rotated(by: CGFloat.pi)
case .left, .leftMirrored:
transform = transform.translatedBy(x: width, y: 0)
transform = transform.rotated(by: 0.5*CGFloat.pi)
case .right, .rightMirrored:
transform = transform.translatedBy(x: 0, y: height)
transform = transform.rotated(by: -0.5*CGFloat.pi)
case .up, .upMirrored:
break
}
switch self.imageOrientation {
case .upMirrored, .downMirrored:
transform = transform.translatedBy(x: width, y: 0)
transform = transform.scaledBy(x: -1, y: 1)
case .leftMirrored, .rightMirrored:
transform = transform.translatedBy(x: height, y: 0)
transform = transform.scaledBy(x: -1, y: 1)
default:
break;
}
// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
guard let colorSpace = cgImage.colorSpace else {
return nil
}
guard let context = CGContext(
data: nil,
width: Int(width),
height: Int(height),
bitsPerComponent: cgImage.bitsPerComponent,
bytesPerRow: 0,
space: colorSpace,
bitmapInfo: UInt32(cgImage.bitmapInfo.rawValue)
) else {
return nil
}
context.concatenate(transform);
switch self.imageOrientation {
case .left, .leftMirrored, .right, .rightMirrored:
// Grr...
context.draw(cgImage, in: CGRect(x: 0, y: 0, width: height, height: width))
default:
context.draw(cgImage, in: CGRect(x: 0, y: 0, width: width, height: height))
}
// And now we just create a new UIImage from the drawing context
guard let newCGImg = context.makeImage() else {
return nil
}
let img = UIImage(cgImage: newCGImg)
return img;
}
(Примечание: версии Swift 3 odes компилируются в Xcode 8.1, но не проверяли, что это на самом деле работает. Возможно, где-то произошла опечатка, перепутаны ширина / высота и т. Д. Не стесняйтесь указывать / исправлять любые ошибки).