前一段时间接到一个需求,说我们的应用需要换一整套皮肤,图片的形状大小尺寸甚至命名都不用修改,无疑这个时候UI设计师和我们的工作显得有些重复而笨重。

无意间找到了一个用代码修改图片颜色,代码无痛接入,简直酸爽!

@interface UIImage (TintCorlor)
///修改图片颜色
- (UIImage *) imageWithTintColor:(UIColor *)tintColor;
///修改图片颜色 同时保留透明度
- (UIImage *) imageWithGradientTintColor:(UIColor *)tintColor;

@end


- (UIImage *) imageWithTintColor:(UIColor *)tintColor{
    return [self imageWithTintColor:tintColor blendMode:kCGBlendModeDestinationIn];
}

- (UIImage *) imageWithGradientTintColor:(UIColor *)tintColor{
    return [self imageWithTintColor:tintColor blendMode:kCGBlendModeOverlay];
}

- (UIImage *) imageWithTintColor:(UIColor *)tintColor blendMode:(CGBlendMode)blendMode{
        //We want to keep alpha, set opaque to NO; Use 0.0f for scale to use the scale factor of the device’s main screen.
    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
    [tintColor setFill];
    CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height);
    UIRectFill(bounds);
        //Draw the tinted image in context
    [self drawInRect:bounds blendMode:blendMode alpha:1.0f];
    if (blendMode != kCGBlendModeDestinationIn) {
        [self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0f];
    }
    UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return tintedImage;
}