IOS两张图片合成为一张图片

- (UIImage *)addImage:(UIImage *)image1 toImage:(UIImage *)image2 {
UIGraphicsBeginImageContext(image1.size);

// Draw image1
[image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];

// Draw image2
[image2 drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];

UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return resultingImage;
}