IOS給圖片加浮水印

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/** *  imageWithBackgroundImage:: * *  @param backgroundImage 背景圖片名 *  @param logoImage       浮水印圖片名 * *  @return 加上浮水印後的圖片 */+ (instancetype)imageWithBackgroundImage:(NSString *)backgroundImage withLogoImage:(NSString *)logoImage{    UIImage *image = [UIImage imageNamed:backgroundImage];        //1.開啟一個基於位元影像bitmap上下文    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0.0);        //2.畫背景    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];        //3.畫浮水印    //3.1設定浮水印圖片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畫浮水印    [log drawInRect:CGRectMake(logoX, logoY, logoW, logoH)];        //4.從圖形上下文取出圖片    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();       return newImage;}

 

IOS給圖片加浮水印