ios - 创建带有渐变边框和渐变文本的清除按钮

Question

我正在尝试将渐变添加到我的 UIButton 标题和按钮的边框。我已经在这里完成了大部分解决方案，我无法为我的生活工作，可能已经过时了，我不确定。所以目前我扩展 UIView 以设置任何渐变。那么我该如何为这个功能添加另一个功能呢？

func setGradientBackground(colorOne: UIColor, colorTwo: UIColor)  {
    let gradientlayer = CAGradientLayer()
    gradientlayer.frame = bounds
    gradientlayer.colors = [colorOne.cgColor, colorTwo.cgColor]
    gradientlayer.locations = [0, 1]
    gradientlayer.startPoint = CGPoint(x: 1.0, y: 0.0)
    gradientlayer.endPoint = CGPoint(x: 0.0, y: 0.0)

    layer.insertSublayer(gradientlayer, at: 0)

}

标签： iosswiftuibuttonuikit

Answer 1

我为您创建了一个演示，您可以在CAGradientLayer查看以下输出和代码的帮助下完成此操作。

故事板：

对于渐变按钮文本颜色和边框放在你UIButton里面UIView，然后分配CAGradientLayer给UIview.

注意：-不要忘记将按钮设置为视图掩码，请参见以下代码。

import UIKit

class ViewController: UIViewController {

    @IBOutlet var viewForButton: UIView!
    @IBOutlet var myButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        // Create a gradient layer
        let gradient = CAGradientLayer()

        // gradient colors in order which they will visually appear
        gradient.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]

        // Gradient from left to right
        gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
        gradient.endPoint = CGPoint(x: 1.0, y: 0.5)

        // set the gradient layer to the same size as the view
        gradient.frame = viewForButton.bounds

        // add the gradient layer to the views layer for rendering
        viewForButton.layer.insertSublayer(gradient, at: 0)

        // Tha magic! Set the button as the views mask
        viewForButton.mask = myButton

        //Set corner Radius and border Width of button
        myButton.layer.cornerRadius =  myButton.frame.size.height / 2
        myButton.layer.borderWidth = 5.0
    }

}

扩展名：您也可以更喜欢这个扩展名。

extension UIView{

    func gradientButton(_ buttonText:String, startColor:UIColor, endColor:UIColor) {

        let button:UIButton = UIButton(frame: self.bounds)
        button.setTitle(buttonText, for: .normal)

        let gradient = CAGradientLayer()
        gradient.colors = [startColor.cgColor, endColor.cgColor]
        gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
        gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
        gradient.frame = self.bounds
        self.layer.insertSublayer(gradient, at: 0)
        self.mask = button

        button.layer.cornerRadius =  button.frame.size.height / 2
        button.layer.borderWidth = 5.0
    }
}

如何使用：

testView.gradientButton("Hello", startColor: .red, endColor: .blue)