ios - iOS UIImage图像倒置

如果我绘制图像，则使用CGAffinetransform

CGAffineTransform myTr = CGAffineTransformMake(1, 0, 0, -1, 0, backImage.size.height);
CGContextConcatCTM(context, myTr);
[backImage drawInRect:CGRectMake(cbx, -cby, backImage.size.width, backImage.size.height)];
myTr = CGAffineTransformMake(1, 0, 0, -1, 0, backImage.size.height);
CGContextConcatCTM(context, myTr);

解决了问题
当我想写文件时
我用这个

 NSData *imageData = UIImageJPEGRepresentation(backImage, 0);

然后将图像倒置
如何 ？

最佳答案

当您想要保存UIImage时，请使用:

UIGraphicsBeginImageContextWithOptions(size, isOpaque, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawImage(context, (CGRect){ {0,0}, origSize }, [origImage CGImage]);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;

然后做:

 NSData *imageData = UIImageJPEGRepresentation(backImage, 0);

关于ios - iOS UIImage图像倒置，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/11739816/