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- (void)watermark {
UIImage *oldImage = [UIImage imageNamed:@"事先准备好的图片,你将要在这帐图片上添加水印"];
UIGraphicsBeginImageContextWithOptions(oldImage.size, NO, 0.0);
[oldImage drawInRect:CGRectMake(0, 0, oldImage.size.width, oldImage.size.height)];
UIImage *waterImage = [UIImage imageNamed:@"这是您将要在事先准备好的图片上放置的logo"];
CGFloat waterW = 50;
CGFloat waterH = 25;
CGFloat waterX = oldImage.size.width - waterW - 5;
CGFloat waterY = oldImage.size.height - waterH - 5;
CGRect waterRect = CGRectMake(waterX, waterY, waterW, waterH);
[waterImage drawInRect:waterRect];
//得到最终的图片
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.imageView.image = newImage;
NSData *data = UIImagePNGRepresentation(newImage);
[data writeToFile:@"将弄好的图片保存到的文件路径/图片名.png" atomically:YES];
}
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原文地址：http://www.cnblogs.com/iOS771722918/p/4431654.html
