ios圖片加水印或文字

 

ios圖片加水印或文字
詳情可見附件,我親自測試了一下,發現原來的方法確實存在諸多問題,從新寫了一下,你們隨意取用,有問題再交流
發一張截圖

 
原帖:[url]http://hi.baidu.com/peter_wwj/item/179cbe060c570e873c42e298[/url]
1.加文字ios

?測試

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- (UIImage *)imageWithLogoText:(UIImage *)img text:(NSString *)text1

{    

    /////注:此爲後來更改,用於顯示中文。zyq,2013-5-8

    CGSize size = CGSizeMake(200, img.size.height);          //設置上下文(畫布)大小

    UIGraphicsBeginImageContext(size);                       //建立一個基於位圖的上下文(context),並將其設置爲當前上下文

    CGContextRef contextRef = UIGraphicsGetCurrentContext(); //獲取當前上下文

    CGContextTranslateCTM(contextRef, 0, img.size.height);   //畫布的高度

    CGContextScaleCTM(contextRef, 1.0, -1.0);                //畫布翻轉

    CGContextDrawImage(contextRef, CGRectMake(0, 0, img.size.width, img.size.height), [img CGImage]);  //在上下文種畫當前圖片

     

    [[UIColor redColor] set];                                //上下文種的文字屬性

    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];       //此處設置文字顯示的位置

    UIImage *targetimg =UIGraphicsGetImageFromCurrentImageContext();  //從當前上下文種獲取圖片

    UIGraphicsEndImageContext();                            //移除棧頂的基於當前位圖的圖形上下文。

    return targetimg;

     

     

    //注:此爲原來,不能顯示中文。無用。

    //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

     

    //原圖

    [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];

     

    //文字顏色

    [color set];

     

    //水印文字

    [markString drawInRect:rect withFont:font];

     

    UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

     

    return newPic;

}


3.仍是添加文字水印方法二

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#pragma mark -仍是文字水印

- (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

     

    //原圖

    [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];

     

    //文字顏色

    [color set];

     

    //水印文字

    [markString drawAtPoint:point withFont:font];

     

    UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

     

    return newPic;

}



4.加圖片

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#pragma mark - 加圖片水印

-(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.新的添加圖片水印的方法

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#pragma mark -仍是圖片水印

- (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

     

    //原圖

    [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];

    //水印圖

    [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;

}

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