UIImage *imaged = [UIImage imageWithCGImage:image.CGImage scale:1.0 orientation:UIImageOrientationUp];
/*
cgImage:cgImage = image.CGImage image为原始图片
scale:原始图片放大倍数
orientation:即UIImage的imageOrientation属性 控制image的绘制方向
*/
+ (UIImage *)imageWithCGImage:(CGImageRef)cgImage scale:(CGFloat)scale orientation:(UIImageOrientation)orientation API_AVAILABLE(ios(4.0));
/*
typedef NS_ENUM(NSInteger, UIImageOrientation) {
UIImageOrientationUp, // default orientation
UIImageOrientationDown, // 180 deg rotation
UIImageOrientationLeft, // 90 deg CCW
UIImageOrientationRight, // 90 deg CW
UIImageOrientationUpMirrored, // as above but image mirrored along other axis. horizontal flip
UIImageOrientationDownMirrored, // horizontal flip
UIImageOrientationLeftMirrored, // vertical flip
UIImageOrientationRightMirrored, // vertical flip
};
*/
UIImageOrientationUp:表示图片的正常状态
UIImageOrientationDown:表示图片被翻转180°
UIImageOrientationLeft:表示图片被逆时针翻转90°
UIImageOrientationRight:表示图片被顺时针翻转90°
UIImageOrientationUpMirrored:表示图片的正常状态的镜面图像
UIImageOrientationDownMirrored:表示图片被翻转180°后的镜面图像
UIImageOrientationLeftMirrored:表示图片被逆时针翻转90°后的镜面图像
UIImageOrientationRightMirrored:表示图片被顺时针翻转90°后的镜面图像
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