iOS 改变图片颜色

原文地址: https://onevcat.com/2013/04/using-blending-in-ios/

```

+ (UIImage*)getDarkImageWithImage:(UIImage*)image {

if(![imageisKindOfClass:[UIImageclass]]) {

return nil;

}

UIGraphicsBeginImageContextWithOptions(image.size,NO, [UIScreenmainScreen].scale);

//颜色填充

[[UIColorlightGrayColor] setFill];

CGRectbounds =CGRectMake(0,0, image.size.width, image.size.height);

UIRectFill(bounds);

[image drawInRect:boundsblendMode:kCGBlendModeDestinationIn alpha:1.0f];

UIImage*highlighted =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return highlighted;

}

```
这里只简单的将图片变暗, blendMode 我只用了kCGBlendModeDestinationIn一个, 其他的没去试过, 如果需要不同的效果, 可以试试其他的mode