添加水印
1.加文字
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- (UIImage *)imageWithLogoText:(UIImage *)img text:(NSString *)text1{ /////注：此为后来更改，用于显示中文。zyq,2013-5-8 CGSize size = CGSizeMake(200, img.size.height); //设置上下文（画布）大小 UIGraphicsBeginImageContext(size); //创建一个基于位图的上下文(context)，并将其设置为当前上下文 CGContextRef contextRef = UIGraphicsGetCurrentContext(); //获取当前上下文 CGContextTranslateCTM(contextRef, 0, img.size.height); //画布的高度 CGContextScaleCTM(contextRef, 1.0, -1.0); //画布翻转 CGContextDrawImage(contextRef, CGRectMake(0, 0, img.size.width, img.size.height), [img CGImage]); //在上下文种画当前图片 [[UIColor redColor] set]; //上下文种的文字属性 CGContextTranslateCTM(contextRef, 0, img.size.height); CGContextScaleCTM(contextRef, 1.0, -1.0); UIFont *font = [UIFont boldSystemFontOfSize:16]; [text1 drawInRect:CGRectMake(0, 0, 200, 80) withFont:font]; //此处设置文字显示的位置 UIImage *targetimg =UIGraphicsGetImageFromCurrentImageContext(); //从当前上下文种获取图片 UIGraphicsEndImageContext(); //移除栈顶的基于当前位图的图形上下文。 return targetimg; //注：此为原来，不能显示中文。无用。 //get image width and height int w = img.size.width; int h = img.size.height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); //create a graphic context with CGBitmapContextCreate CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage); CGContextSetRGBFillColor(context, 0.0, 1.0, 1.0, 1); char* text = (char *)[text1 cStringUsingEncoding:NSUnicodeStringEncoding]; CGContextSelectFont(context, "Georgia", 30, kCGEncodingMacRoman); CGContextSetTextDrawingMode(context, kCGTextFill); CGContextSetRGBFillColor(context, 255, 0, 0, 1); CGContextShowTextAtPoint(context, w/2-strlen(text)*5, h/2, text, strlen(text)); //Create image ref from the context CGImageRef imageMasked = CGBitmapContextCreateImage(context); CGContextRelease(context); CGColorSpaceRelease(colorSpace); return [UIImage imageWithCGImage:imageMasked];} |
2.新的添加文字水印的方法一
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#pragma mark -也是文字水印- (UIImage *) imageWithStringWaterMark:(NSString *)markString inRect:(CGRect)rect color:(UIColor *)color font:(UIFont *)font{#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000 if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0) { UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen". }#else if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0) { UIGraphicsBeginImageContext([self size]); }#endif //原图 [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)]; //文字颜色 [color set]; //水印文字 [markString drawInRect:rect withFont:font]; UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newPic;} |
3.还是添加文字水印方法二
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#pragma mark -还是文字水印- (UIImage *) imageWithStringWaterMark:(NSString *)markString atPoint:(CGPoint)point color:(UIColor *)color font:(UIFont *)font{#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000 if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0) { UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen". }#else if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0) { UIGraphicsBeginImageContext([self size]); }#endif //原图 [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)]; //文字颜色 [color set]; //水印文字 [markString drawAtPoint:point withFont:font]; UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newPic;} |
4.加图片
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#pragma mark - 加图片水印-(UIImage *)imageWithLogoImage:(UIImage *)img logo:(UIImage *)logo{ //get image width and height int w = img.size.width; int h = img.size.height; int logoWidth = logo.size.width; int logoHeight = logo.size.height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); //create a graphic context with CGBitmapContextCreate CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage); CGContextDrawImage(context, CGRectMake(w-logoWidth, 0, logoWidth, logoHeight), [logo CGImage]); CGImageRef imageMasked = CGBitmapContextCreateImage(context); CGContextRelease(context); CGColorSpaceRelease(colorSpace); return [UIImage imageWithCGImage:imageMasked]; // CGContextDrawImage(contextRef, CGRectMake(100, 50, 200, 80), [smallImg CGImage]);} |
5.新的添加图片水印的方法
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#pragma mark -还是图片水印- (UIImage *) imageWithWaterMask:(UIImage*)mask inRect:(CGRect)rect{#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000 if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0) { UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen". }#else if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0) { UIGraphicsBeginImageContext([self size]); }#endif //原图 [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)]; //水印图 [mask drawInRect:rect]; UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newPic;} |
6 .加半透明的水印
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//加半透明的水印-(UIImage *)imageWithTransImage:(UIImage *)useImage addtransparentImage:(UIImage *)transparentimg{ UIGraphicsBeginImageContext(useImage.size); [useImage drawInRect:CGRectMake(0, 0, useImage.size.width, useImage.size.height)]; [transparentimg drawInRect:CGRectMake(0, useImage.size.height-transparentimg.size.height, transparentimg.size.width, transparentimg.size.height) blendMode:kCGBlendModeOverlay alpha:0.4f]; UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return resultingImage;} |
