UIImage tint color 的增加

参考 https://github.com/kballard/MGImageUtilities

- (UIImage *)imageTintedWithColor:(UIColor *)color

{

if (color) {

// Construct new image the same size as this one.

UIImage *image;

UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".

CGRect rect = CGRectZero;

rect.size = [self size];

// tint the image

[self drawInRect:rect];

[color set];

UIRectFillUsingBlendMode(rect, kCGBlendModeColor);

// restore alpha channel

[self drawInRect:rect blendMode:kCGBlendModeDestinationIn alpha:1.0f];

image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;

}

return self;

}