Question

我正在尝试为我的UIButton标题和按钮的边框添加渐变。我不确定这里是否已经过了大部分的解决方案，我不确定我可能会过时。因此，目前我扩展了UIView以设置渐变。那么如何为该功能添加另一个功能？

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)

}

Answer 1

我已经为您创建了一个演示，您可以在CAGradientLayer的帮助下完成此操作，请参见以下输出和代码。

故事板：

对于渐变按钮的文本颜色和边框，请将UIButton放在UIView内，然后将CAGradientLayer分配给UIview。

注意：-不要忘记将按钮设置为视图蒙版，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：您也可以更喜欢此扩展名。

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
    }
}

使用方法：

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

Answer 2

您只需要在UIView扩展下方添加并调用该函数即可获取欲望渐变按钮，

func covertToGradientButtonWith(title: String, radius: CGFloat, borderWidth: CGFloat, gradientStartColor: UIColor, gradientEndColor: UIColor) {

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

    let gradient = CAGradientLayer()
    gradient.colors = [gradientStartColor.cgColor, gradientEndColor.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 =  radius
    button.layer.borderWidth = borderWidth
}

希望，此解决方案可能会对您有所帮助。

创建带有渐变边框和渐变文字的清晰按钮

2 个答案: