UIColor 图案图像和色调颜色

Question

我正在开发一个应用程序，其中的元素需要以不同的颜色进行自定义。到目前为止，我一直在利用 tintColor 和 imageWithRenderingMode 来更改图像颜色。我目前处于需要使用 UIColor(patternImage:) 和 backgroundColor 添加背景平铺图像的情况。有没有办法对背景图块图像应用一种色调，以便我可以在运行时更改背景图像颜色？

Answer 1

您可以将 TintColor 应用于 UIImage 并将该 UIImage 用作平铺的背景色。

将 tintColor 应用于 UIImage：

- (UIImage *) addOverlaytoImage:(UIImage *)mySourceImage
{
    UIImage * image = mySourceImage;
    UIColor * color = [UIColor yellowColor];
    UIGraphicsBeginImageContext(image.size);
    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height) blendMode:kCGBlendModeNormal alpha:1];
    UIBezierPath * path = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, image.size.width, image.size.height)];
    [color setFill];
    [path fillWithBlendMode:kCGBlendModeMultiply alpha:1]; //look up blending modes for your needs
    UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return newImage;
}

然后将此图像添加到背景颜色参数中：

yourView.backgroundColor = [UIColor colorWithPatternImage:[self addOverlaytoImage:myImage]];

请参考以下link：Designing for iOS: Blending Modes

Answer 2

使用我发现的 link 这就是我让它工作的原因

// originalImage and originalColor are defined
var image = originalImage.imageWithRenderingMode(.AlwaysTemplate)
UIGraphicsBeginImageContextWithOptions(
    originalImage.size,
    false,
    originalImage.scale)
originalColor.set()
image.drawInRect(CGRectMake(
    0,
    0,
    originalImage.size.width,
    originalImage.size.height))
image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return UIColor(patternImage: image)

Answer 3

J_P，感谢您的回答！这真的很有帮助。我只想 post Swift 5

的更新版本

extension UIColor {
    convenience init(patternImage: UIImage, tintColor: UIColor) {
        var image = patternImage.withRenderingMode(.alwaysTemplate)
        UIGraphicsBeginImageContextWithOptions(patternImage.size,
                                               false,
                                               patternImage.scale)
        tintColor.set()   
        image.draw(in: CGRect(x: 0, y: 0,
                              width: patternImage.size.width,
                              height: patternImage.size.height))
        image = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        self.init(patternImage: image)
    }
}

UIColor 图案图像和色调颜色

UIColor Pattern Image and Tint Color

ios

uiimage

uicolor

tintcolor