觸摸調整一個UIButton的亮點光暈半徑大小

Question

背景：

的UIButton控制有一個屬性「顯示觸摸就突出了」可以在故事板進行設置。選中此選項後，觸摸UIButton，UIButton文字上將顯示白光。

問：

我怎麼能觸摸時調整UIButton光暈的半徑大小？

Answer 1

您的按鈕連接到一個@IBOutlet並調用它button，那麼你就可以做到這一點的把這個代碼裏面viewDidLoad方法：

button.layer.shadowColor = UIColor.red.cgColor 
button.layer.shadowRadius = 30.0 
button.layer.shadowOpacity = 0.9 
button.layer.shadowOffset = CGSize.zero 
button.layer.masksToBounds = false 

，你可以改變的方式定製你喜歡。祝你好運！

Answer 2

從我以前的答案Need a Glowing Animation around a button我一直在努力使用代碼，加入一些自定義，以解決您的答案，這裏是結果，如果設置animateAllways = false這個自定義按鈕的行爲，因爲你需要

// 
// GlowingButton.swift 
// NavigationButtonRotateQuestion 
// 
// Created by Reinier Melian on 01/07/2017. 
// Copyright © 2017 Pruebas. All rights reserved. 
// 

import UIKit 

@IBDesignable 
class GlowingButton: UIButton { 

    @IBInspectable var animDuration : CGFloat = 3 
    @IBInspectable var cornerRadius : CGFloat = 5 
    @IBInspectable var maxGlowSize : CGFloat = 10 
    @IBInspectable var minGlowSize : CGFloat = 0 
    @IBInspectable var glowColor : UIColor = nil ?? UIColor.red 
    @IBInspectable var animateAllways : Bool = false 
    fileprivate var animating : Bool = false 

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

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

    override func awakeFromNib() { 
     super.awakeFromNib() 
     self.contentScaleFactor = UIScreen.main.scale 
     self.layer.masksToBounds = false 

     if(self.animateAllways){ 
      self.setupButtonForContinueAnimation() 
      self.startAnimation() 
     }else{ 
      self.setupButton() 
     } 
    } 

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { 

     if(!self.animateAllways){ 
     let layerAnimation = CABasicAnimation(keyPath: "shadowRadius") 
     layerAnimation.fromValue = minGlowSize 
     layerAnimation.toValue = maxGlowSize 
     layerAnimation.isAdditive = false 
     layerAnimation.duration = CFTimeInterval(animDuration/2) 
     layerAnimation.fillMode = kCAFillModeForwards 
     layerAnimation.isRemovedOnCompletion = false 
     self.layer.add(layerAnimation, forKey: "addGlowing") 
     } 
    } 

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) { 

    } 

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) { 

     if(!self.animateAllways){ 
     let layerAnimation = CABasicAnimation(keyPath: "shadowRadius") 
     layerAnimation.fromValue = maxGlowSize 
     layerAnimation.toValue = minGlowSize 
     layerAnimation.isAdditive = false 
     layerAnimation.duration = CFTimeInterval(animDuration/2) 
     layerAnimation.fillMode = kCAFillModeForwards 
     layerAnimation.isRemovedOnCompletion = false 
     self.layer.add(layerAnimation, forKey: "removeGlowing") 
     } 
    } 

    override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) { 

     if(!self.animateAllways){ 
     let layerAnimation = CABasicAnimation(keyPath: "shadowRadius") 
     layerAnimation.fromValue = maxGlowSize 
     layerAnimation.toValue = minGlowSize 
     layerAnimation.isAdditive = false 
     layerAnimation.duration = CFTimeInterval(animDuration/2) 
     layerAnimation.fillMode = kCAFillModeForwards 
     layerAnimation.isRemovedOnCompletion = false 
     self.layer.add(layerAnimation, forKey: "removeGlowing") 
     } 
    } 

    func setupButton() 
    { 
     self.layer.cornerRadius = cornerRadius 
     self.layer.shadowPath = CGPath(roundedRect: self.bounds, cornerWidth: cornerRadius, cornerHeight: cornerRadius, transform: nil) 
     self.layer.shadowRadius = 0 
     self.layer.shadowColor = self.glowColor.cgColor 
     self.layer.shadowOffset = CGSize.zero 
     self.layer.shadowOpacity = 1 
    } 

    func setupButtonForContinueAnimation() 
    { 
     self.setupButton() 
     self.layer.shadowRadius = maxGlowSize 
    } 

    func startAnimation() 
    { 
     let layerAnimation = CABasicAnimation(keyPath: "shadowRadius") 
     layerAnimation.fromValue = maxGlowSize 
     layerAnimation.toValue = minGlowSize 
     layerAnimation.autoreverses = true 
     layerAnimation.isAdditive = false 
     layerAnimation.duration = CFTimeInterval(animDuration/2) 
     layerAnimation.fillMode = kCAFillModeForwards 
     layerAnimation.isRemovedOnCompletion = false 
     layerAnimation.repeatCount = .infinity 
     self.layer.add(layerAnimation, forKey: "glowingAnimation") 

    } 

} 

希望這有助於你