ios - 当按钮具有动画和渐变 mask 时，点击手势不起作用

Question

我想为按钮标题添加渐变，并且按钮应该具有闪烁/闪烁等动画。添加此后，点击手势将不起作用

我使用 Storyboard创建了一个名为“maskingView”的 View ，并且按钮位于该名为“btnGradient”的 View 内

    let gradient = CAGradientLayer()
    gradient.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
    gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
    gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
    gradient.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 30)
    maskingView = btnGradient

    // function for animation
    blinkAnimation()

    let tap = UITapGestureRecognizer(target: self, action: #selector(self.goToOtherView(gesture:)))
    tap.delegate = self
    tap.numberOfTapsRequired = 1
    self. maskingView.isUserInteractionEnabled = true
    self. maskingView.addGestureRecognizer(tap)
    maskingView.layer.insertSublayer(gradient, at: 0)


    func blinkAnimation(){
    maskingView.alpha = 1.0
    UIView.animate(withDuration: 0.5, delay: 0.0, options: [.repeat, .autoreverse, .allowUserInteraction], animations: {
        self.maskingView.alpha = 0.0
    }, completion: nil)
    }

Answer 1

这不起作用，因为您正在设置 self.maskingView.alpha = 0.0。如果您将 alpha 设置为 0 那么系统会将其视为隐藏 View !一旦尝试设置类似 alpha，

self.maskingView.alpha = 0.1

示例代码:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var maskingView: UIView!
    override func viewDidLoad() {
        super.viewDidLoad()

        let gradient = CAGradientLayer()
        gradient.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
        gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
        gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
        gradient.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 30)

        // function for animation
        blinkAnimation()

        let tap = UITapGestureRecognizer(target: self, action: #selector(self.goToOtherView(gesture:)))
        tap.numberOfTapsRequired = 1
        self.maskingView.isUserInteractionEnabled = true
        self.maskingView.addGestureRecognizer(tap)
        maskingView.layer.insertSublayer(gradient, at: 0)

        // Do any additional setup after loading the view.
    }

    func blinkAnimation(){
        maskingView.alpha = 1.0
        UIView.animate(withDuration: 0.5, delay: 0.0, options: [.repeat, .autoreverse, .allowUserInteraction], animations: {
            self.maskingView.alpha = 0.1
        }, completion: nil)
    }

    @objc func goToOtherView(gesture:Any) {
        print("tap")
    }
}