改变iphone sdk中的图像颜色 [英] changing the color of image in iphone sdk

问题描述

我有一张图片&我想通过编程来改变图像的颜色。

& 我要更改此图片的颜色

解决方案

更新： b
$ b

使用此方法...

   - （UIImage *）imageNamed：（NSString * ）name withColor：（UIColor *）color {
 //加载图片
 
 UIImage * img = [UIImage imageNamed：name]; 
 
 //开始一个新的图像上下文，将我们的彩色图像绘制到
 UIGraphicsBeginImageContext（img.size）; 
 
 //获取对我们创建的上下文的引用
 CGContextRef context = UIGraphicsGetCurrentContext（）; 
 
 //设置填充颜色
 [color setFill]; 
 
 //翻译/翻转图形上下文（用于从CG * coords转换为UI * coords 
 CGContextTranslateCTM（context，0，img.size.height）; 
 CGContextScaleCTM context，1.0，-1.0）; 
 
 //将混合模式设置为彩色刻录，原始图像
 CGContextSetBlendMode（context，kCGBlendModeColorBurn）; 
 CGRect rect = CGRectMake 0，0，img.size.width，img.size.height）; 
 CGContextDrawImage（context，rect，img.CGImage）; 
 
 //设置一个与图像，然后绘制（颜色烧伤）彩色矩形
 CGContextClipToMask（context，rect，img.CGImage）; 
 CGContextAddRect（context，rect）; 
 CGContextDrawPath（context，kCGPathFill）; 
 
 //从我们绘制的图形上下文生成一个新的UIImage 
 UIImage * coloredImg = UIGraphicsGetImageFromCurrentImageContext（）; 
 UIGraphicsEndImageContext（）; 
 
返回彩色图像
 return coloredImg; 
} 
  

使用它像下面...

  yourImageView.image = [self imageNamed：@yourImageNamewithColor：[UIColor orangeColor]]; 
  

希望对您有帮助.....

I have a image & i want to change the color of that image through programatically.

& I want to change the color of this image

解决方案

UPDATE:

Use this method...

-(UIImage *)imageNamed:(NSString *)name withColor:(UIColor *)color {
    // load the image

    UIImage *img = [UIImage imageNamed:name];

    // begin a new image context, to draw our colored image onto
    UIGraphicsBeginImageContext(img.size);

    // get a reference to that context we created
    CGContextRef context = UIGraphicsGetCurrentContext();

    // set the fill color
    [color setFill];

    // translate/flip the graphics context (for transforming from CG* coords to UI* coords
    CGContextTranslateCTM(context, 0, img.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    // set the blend mode to color burn, and the original image
    CGContextSetBlendMode(context, kCGBlendModeColorBurn);
    CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
    CGContextDrawImage(context, rect, img.CGImage);

    // set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
    CGContextClipToMask(context, rect, img.CGImage);
    CGContextAddRect(context, rect);
    CGContextDrawPath(context,kCGPathFill);

    // generate a new UIImage from the graphics context we drew onto
    UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //return the color-burned image
    return coloredImg;
}

Use it like bellow...

yourImageView.image = [self imageNamed:@"yourImageName" withColor:[UIColor orangeColor]];

hope this helpful to you.....

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