R = D*Sa ：目标色 = 原色*目标色的透明度
R--result
S--原色
D--目标色
Ra、Sa、Da分别为三种颜色的透明度
- (UIImage *)changImageColorWithImage:(UIImage *)image color:(UIColor *)targetColor blendModel:(CGBlendMode)mode
{
//获取画布
UIGraphicsBeginImageContext(image.size);
//画笔沾取颜色
[targetColor setFill];
CGRect drawRect = CGRectMake(0, 0, image.size.width, image.size.height);
UIRectFill(drawRect);
[image drawInRect:drawRect blendMode:mode alpha:1];
//获取图片
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
原图
设置 blendMode 为 kCGBlendModeDestinationIn targetColor为RGB(255,115,25)
转换后的图片
