Swift 如何更改 UITextField 上清除按钮的色调 colored颜色

发布于05月29日

我的UITextfield上有一个自动生成的清除按钮，默认为蓝色.我不能把色调改成白色.我try 过修改故事板和代码，但没有成功，我不想使用自定义图像.

如何在不使用自定义图像的情况下更改默认的"清除"按钮色调？

推荐答案

干得好！

一个文本字段.

不使用自定义图像或添加按钮等.

取消按钮带有白色色调的UITextField图像

class TintTextField: UITextField {

     var tintedClearImage: UIImage?

     required init(coder aDecoder: NSCoder) {
       super.init(coder: aDecoder)
       self.setupTintColor()
     }

     override init(frame: CGRect) {
       super.init(frame: frame)
       self.setupTintColor()
     }

     func setupTintColor() {
       self.borderStyle = UITextField.BorderStyle.roundedRect
       self.layer.cornerRadius = 8.0
       self.layer.masksToBounds = true
       self.layer.borderColor = self.tintColor.cgColor
       self.layer.borderWidth = 1.5
       self.backgroundColor = .clear
       self.textColor = self.tintColor
     }

    override func layoutSubviews() {
        super.layoutSubviews()
        self.tintClearImage()
    }

    private func tintClearImage() {
        for view in subviews {
            if view is UIButton {
                let button = view as! UIButton
                if let image = button.image(for: .highlighted) {
                    if self.tintedClearImage == nil {
                        tintedClearImage = self.tintImage(image: image, color: self.tintColor)
                    }
                    button.setImage(self.tintedClearImage, for: .normal)
                    button.setImage(self.tintedClearImage, for: .highlighted)
                }
            }
        }
    }

    private func tintImage(image: UIImage, color: UIColor) -> UIImage {
        let size = image.size

        UIGraphicsBeginImageContextWithOptions(size, false, image.scale)
        let context = UIGraphicsGetCurrentContext()
        image.draw(at: .zero, blendMode: CGBlendMode.normal, alpha: 1.0)

        context?.setFillColor(color.cgColor)
        context?.setBlendMode(CGBlendMode.sourceIn)
        context?.setAlpha(1.0)

        let rect = CGRect(x: CGPoint.zero.x, y: CGPoint.zero.y, width: image.size.width, height: image.size.height)
        UIGraphicsGetCurrentContext()?.fill(rect)
        let tintedImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return tintedImage ?? UIImage()
    }
 }