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UIImageの色を変更する方法

UIImageのbackgroundColorを変更したくない、
ではなく、画像全体の色を変更します。

ポップオーバーからビューに移動できる標準フォームがあるからです。
私のアプリでは、画像を1つの大きな画像、つまりテーブルに変更できます。
さらに、色を白茶色などに変更したいです。

しかし、問題は：backgroundColorしか変更できないことです。
UIImageの色を変更する方法はありますか？

前もって感謝します

iosuiimageuicolor
42
Studie
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;
58
Lloyd18

受け入れられた答えは正しいですが、UIImageViewにはもっと多くの簡単な方法があります：

Obj-C：

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

Swift 2：

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

スウィフト3：

let theImageView = UIImageView(image: UIImage(named:"foo")!.withRenderingMode(.alwaysTemplate))
theImageView.tintColor = UIColor.red
119
skywinder

Swift 3.2および4

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

つかいます ：

self.yourImageView.changePngColorTo(color: .red)
5
gamal

詳細

  • Xcode 10.2.1（10E1001）、Swift 5

方法1.拡張UIImage

ソース： 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
    }
}

使用法

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)

方法2.拡張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 }
    }
}

使用法

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

完全なサンプル

上に配置したすべてのコードをここに貼り付けることを忘れないでください

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 }
}

絵コンテ

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結果

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4
Vasily Bodnarchuk

次のコードを使用してSwiftでこれを行うこともできます。

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

tintedImage.tintColor = UIColor.redColor()
4
Bob Mosby

Swift 3 + Interface Builder（ストーリーボード）

インターフェイスビルダーでUIImageViewを追加した場合：

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

myIconはストーリーボードのアウトレットです。例：@IBOutlet weak var myIcon: UIImageView!

0
lenooh