1.加文字
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 - (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
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 #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
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 #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
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 #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
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 #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
? 1 2 3 4 5 6 7 8 9 10 11 //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; }转载于:https://www.cnblogs.com/piaojin/p/5853361.html
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