ios - 如何更改 UIImage 的颜色

Question

我不想改变 UIImage 的 backgroundColor，
而是改变整个图像的颜色。

因为我有标准表格，我可以从弹出窗口移动到视图。
在我的应用程序中，可以将图像修补为一个大图像，即一张桌子。
此外，我想将颜色更改为白棕色或其他颜色。

但问题是：我只能改变backgroundColor
有什么办法可以改变UIImage的颜色吗？

先感谢您

Answer 1

接受的答案是正确的，但有一种更简单的方法UIImageView：

对象-C：

UIImage *image = [UIImage imageNamed:@"foo.png"];
theImageView.image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[theImageView setTintColor:[UIColor redColor]];

斯威夫特 2：

let theImageView = UIImageView(image: UIImage(named:"foo")!.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate))
theImageView.tintColor = UIColor.redColor()

斯威夫特 3：

let theImageView = UIImageView(image: UIImage(named:"foo")!.withRenderingMode(.alwaysTemplate))
theImageView.tintColor = UIColor.red

Answer 2

UIImage *image = [UIImage imageNamed:@"triangle.png"];

CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextClipToMask(context, rect, image.CGImage);
CGContextSetFillColorWithColor(context, [[UIColor redColor] CGColor]);
CGContextFillRect(context, rect);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIImage *flippedImage = [UIImage imageWithCGImage:img.CGImage 
                                            scale:1.0 orientation: UIImageOrientationDownMirrored];

yourUIImageView.image = flippedImage;

Answer 3

对于 swift 3.2 和 4

extension UIImageView{
    func changePngColorTo(color: UIColor){
        guard let image =  self.image else {return}
        self.image = image.withRenderingMode(.alwaysTemplate)
        self.tintColor = color
    }
}

利用 ：

self.yourImageView.changePngColorTo(color: .red)

Answer 4

Details

• Xcode 10.2.1 (10E1001), Swift 5

Way 1. Extension UIImage

source: https://stackoverflow.com/a/40177870/4488252

extension UIImage {

    convenience init?(imageName: String) {
        self.init(named: imageName)
        accessibilityIdentifier = imageName
    }

    // https://stackoverflow.com/a/40177870/4488252
    func imageWithColor (newColor: UIColor?) -> UIImage? {

        if let newColor = newColor {
            UIGraphicsBeginImageContextWithOptions(size, false, scale)

            let context = UIGraphicsGetCurrentContext()!
            context.translateBy(x: 0, y: size.height)
            context.scaleBy(x: 1.0, y: -1.0)
            context.setBlendMode(.normal)

            let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
            context.clip(to: rect, mask: cgImage!)

            newColor.setFill()
            context.fill(rect)

            let newImage = UIGraphicsGetImageFromCurrentImageContext()!
            UIGraphicsEndImageContext()
            newImage.accessibilityIdentifier = accessibilityIdentifier
            return newImage
        }

        if let accessibilityIdentifier = accessibilityIdentifier {
            return UIImage(imageName: accessibilityIdentifier)
        }

        return self
    }
}

Usage

let imageView = UIImageView(frame: CGRect(x: 40, y: 250, width: 40, height: 40))
view.addSubview(imageView)
// Set color
imageView.image = UIImage(imageName: "Apple")?.imageWithColor(newColor: UIColor.blue)
// Reset color
//imageView.image = imageView.image?.imageWithColor(newColor: nil)

Way 2. Extension UIImageView

extension UIImageView {

    var imageColor: UIColor? {
        set (newValue) {
            guard let image = image else { return }
            if newValue != nil {
                self.image = image.withRenderingMode(.alwaysTemplate)
                tintColor = newValue
            } else {
                self.image = image.withRenderingMode(.alwaysOriginal)
                tintColor = UIColor.clear
            }
        }
        get { return tintColor }
    }
}

Usage

let imageView = UIImageView(frame: CGRect(x: 40, y: 250, width: 40, height: 40))
view.addSubview(imageView)
imageView.image = UIImage(imageName: "Apple")
// Set color
imageView.imageColor = UIColor.green
// Reset color
//imageView.imageColor = nil

Full sample

Do not forget to paste here all code which placed above

import UIKit

class ImageView: UIImageView {
    enum ImageColorTransformType {
        case none, imageExtension, imageViewExtension
    }
    var imageColorTransformType = ImageColorTransformType.none
}

class ViewController: UIViewController {

    weak var colorSwitchButton: UIBarButtonItem?

    private var imageViews = [ImageView]()
    private var appleImage: UIImage { return UIImage(imageName: "apple")! }
    private var redAppleImage: UIImage { return UIImage(imageName: "red_apple")! }

    override func viewDidLoad() {
        super.viewDidLoad()
        createNewImageView(x: 40, y:100, image:appleImage, imageColorTransformType: .none)
        createNewImageView(x: 100, y:100, image:appleImage, imageColorTransformType: .imageExtension)
        createNewImageView(x: 160, y:100, image:appleImage, imageColorTransformType: .imageViewExtension)

        createNewImageView(x: 40, y:160, image:redAppleImage, imageColorTransformType: .none)
        createNewImageView(x: 100, y:160, image:redAppleImage, imageColorTransformType: .imageExtension)
        createNewImageView(x: 160, y:160, image:redAppleImage, imageColorTransformType: .imageViewExtension)

        let buttonItem = UIBarButtonItem(title: "switch", style: .plain, target: self,
                                         action: #selector(colorSwitchButtonTouchedUpInside(_:)))
        navigationItem.rightBarButtonItem = buttonItem
        colorSwitchButton = buttonItem
        useOriginalColors = false
    }

    private func createNewImageView(x:CGFloat, y: CGFloat, image: UIImage, imageColorTransformType: ImageView.ImageColorTransformType) {
        let imageView = ImageView(frame: CGRect(x: x, y: y, width: 40, height: 40))
        imageView.image = image
        imageView.imageColorTransformType = imageColorTransformType
        imageViews.append(imageView)
        view.addSubview(imageView)
    }

    private var _useOriginalColors = false
    private var useOriginalColors: Bool {
        set(value) {
            _useOriginalColors = value
            if (value) {
                navigationItem.title = "Original colors"
                for imageView in imageViews {
                    switch imageView.imageColorTransformType {
                    case .imageExtension: imageView.image = imageView.image?.imageWithColor(newColor: nil)
                    case .imageViewExtension: imageView.imageColor = nil
                    case .none: break
                    }
                }
            } else {
                navigationItem.title = "Template colors"
                for imageView in imageViews {
                    switch imageView.imageColorTransformType {
                    case .imageExtension: imageView.image = imageView.image?.imageWithColor(newColor: UIColor.blue)
                    case .imageViewExtension: imageView.imageColor = UIColor.green
                    case .none: break
                    }
                }
            }
        }
        get { return _useOriginalColors }
    }

    @objc func colorSwitchButtonTouchedUpInside(_ sender: Any) { useOriginalColors = !useOriginalColors }
}

Storyboard

Result

Answer 5

您也可以使用以下代码快速执行此操作：

// language: Swift
let tintedImage = UIImageView(image: UIImage(named:"whatever")!.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate))

tintedImage.tintColor = UIColor.redColor()

Answer 6

Swift + 界面构建器（故事板）

如果您在界面生成器中添加了 UIImageView：

myIcon.image = myIcon.image!.withRenderingMode(UIImageRenderingMode.alwaysTemplate)
myIcon.tintColor = UIColor.red // your color

myIcon你的故事板的出口在哪里，例如：@IBOutlet weak var myIcon: UIImageView!

Answer 7

更改 UIImageView 中图像的颜色：

public extension UIImageView {
    func tintImage(color: UIColor) {
        image = image?.tint(color: color)
    }
}

只需调用方法：

imageView.tintImage(color: .red)

Answer 8

添加到skywinder的答案

您也可以在按钮上执行此操作：

UIImage *image = [UIImage imageNamed:@"foo.png"];
[myButton setImage:[image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate] forState:UIControlStateNormal];
[myButton setTintColor:[UIColor redColor]];