ios - 如何水平翻转 UIImage？

Question

如何水平翻转UIImage，我在UIImage类引用中找到了UIImageOrientationUpMirrored枚举值，如何利用这个属性来翻转 UIImage。

Answer 1

objective-C

UIImage* sourceImage = [UIImage imageNamed:@"whatever.png"];

UIImage* flippedImage = [UIImage imageWithCGImage:sourceImage.CGImage 
                                            scale:sourceImage.scale
                                      orientation:UIImageOrientationUpMirrored];

swift

let flippedImage = myImage.withHorizontallyFlippedOrientation()