IOS给图片加水印
/** * imageWithBackgroundImage:: * * @param backgroundImage 背景图片名 * @param logoImage 水印图片名 * * @return 加上水印后的图片 */ + (instancetype)imageWithBackgroundImage:(NSString *)backgroundImage withLogoImage:(NSString *)logoImage { UIImage *image = [UIImage imageNamed:backgroundImage]; //1.开启一个基于位图bitmap上下文 UIGraphicsBeginImageContextWithOptions(image.size, NO, 0.0); //2.画背景 [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)]; //3.画水印 //3.1设置水印图片frame UIImage *log = [UIImage imageNamed:logoImage]; CGFloat margin = 5.0; CGFloat scale = 0.2; CGFloat logoW = log.size.width * scale; CGFloat logoH = log.size.height * scale; CGFloat logoX = image.size.width - logoW - margin; CGFloat logoY = image.size.height - logoH - margin; //3.2画水印 [log drawInRect:CGRectMake(logoX, logoY, logoW, logoH)]; //4.从图形上下文取出图片 UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); return newImage; }
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