iOS中UIView實(shí)現(xiàn)不同方向的導(dǎo)角

發(fā)布時(shí)間：2020-09-19 18:46:59 來源：腳本之家閱讀：205 作者：東引甌越欄目：移動(dòng)開發(fā)

前言

開發(fā)中總因?yàn)橐恍┍容^蛋疼的導(dǎo)角問題而困擾著我們,尤其是我們要給一個(gè)UIView導(dǎo)角成左上、左下。。。

這種需求很值得用代碼實(shí)現(xiàn)一下, 今天突然在AppCode找到了一篇好文章.于是有了下文

通常導(dǎo)角

self.view.cornerRadius = 20.0
self.view.clipToBounds = true

這兩行代碼是全方向?qū)Ы?/p>

如果像要搞成不同方向的話可以用iOS11 新的API和 iOS11以前的CAShapeLayer畫貝賽爾曲線來解決

首先我們要?jiǎng)?chuàng)建一個(gè)UIView

class ViewController: UIViewController {
 var cardView: UIView!
 override func viewDidLoad() {
  super.viewDidLoad()
  cardView = UIView()
  view.addSubview(cardView)
cardView.translatesAutoresizingMaskIntoConstraints = false
  //把View居中
  cardView.widthAnchor.constraint(equalToConstant: 200).isActive = true
  cardView.heightAnchor.constraint(equalToConstant: 200).isActive = true
  cardView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
  cardView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
  cardView.backgroundColor = UIColor(red: 1.0, green: 0.784, blue: 0.2, alpha: 1)  
 }
}

iOS11 以后蘋果提供了一個(gè)UIView的屬性叫maskedCorners用于CALayer的動(dòng)畫相關(guān).

public struct CACornerMask : OptionSet {
 public init(rawValue: UInt)
 
 public static var layerMinXMinYCorner: CACornerMask { get }
 public static var layerMaxXMinYCorner: CACornerMask { get }
 public static var layerMinXMaxYCorner: CACornerMask { get }
 public static var layerMaxXMaxYCorner: CACornerMask { get }
}

下面我說一下

layerMinXMinYCorner 底部右側(cè) 的圓角 -> 右下角
layerMaxXMinYCorner 頂部右側(cè) 的圓角 -> 右上角
layerMinXMaxYCorner 底部左側(cè) 的圓角 -> 左下角
layerMinXMinYCorner 頂部左側(cè) 的圓角 -> 左上角

一般我們都為UIView寫個(gè) extension

extension UIView {
 func roundCorners(cornerRadius: Double) {
  self.layer.cornerRadius = CGFloat(cornerRadius)
  self.clipsToBounds = true
  
  if #available(iOS 11.0, *) {
   self.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
  } else {
   let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
   let maskLayer = CAShapeLayer()
   maskLayer.frame = self.bounds
   maskLayer.path = path.cgPath
   self.layer.mask = maskLayer
  }
  
 }
}

這里區(qū)分了iOS11之前和之后的兩種搞法.

之前的話我們都是用一個(gè)貝塞爾曲線畫path.然后創(chuàng)建CAShapeLayer 給self.layer.mask做一種透明的遮罩來解決不同方向?qū)Ы菃栴}.

添加動(dòng)畫效果的導(dǎo)角

我們?cè)谠?code>ViewDidLoad()方法里面加個(gè)手勢(shì).

并寫好觸發(fā)的事件, 完整的代碼如下

import UIKit
class ViewController: UIViewController {
 var cardView: UIView!
 override func viewDidLoad() {
  super.viewDidLoad()
  cardView = UIView()
  view.addSubview(cardView)cardView.translatesAutoresizingMaskIntoConstraints = false
  cardView.widthAnchor.constraint(equalToConstant: 200).isActive = true
  cardView.heightAnchor.constraint(equalToConstant: 200).isActive = true
  cardView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
  cardView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
  cardView.backgroundColor = UIColor(red: 1.0, green: 0.784, blue: 0.2, alpha: 1)
  let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(animateCornerChange(recognizer:)))
  cardView.addGestureRecognizer(tapRecognizer)
 }

 @objc func animateCornerChange(recognizer: UITapGestureRecognizer) {
  let targetRadius: Double = (cardView.layer.cornerRadius == 0.0) ? 100.0:0.0
  
  if #available(iOS 10.0, *) {
   UIViewPropertyAnimator(duration: 0.4, curve: .easeInOut) {
    self.cardView.roundCorners(cornerRadius: targetRadius)
    }.startAnimation()
  } else {
   UIView.animate(withDuration: 1.0, delay: 0.0, options: .curveEaseInOut, animations: {
    
   }, completion: nil)
  }
 }
}
extension UIView {
 func roundCorners(cornerRadius: Double) {
  self.layer.cornerRadius = CGFloat(cornerRadius)
  self.clipsToBounds = true
  
  if #available(iOS 11.0, *) {
   self.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
  } else {
   let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
   let maskLayer = CAShapeLayer()
   maskLayer.frame = self.bounds
   maskLayer.path = path.cgPath
   self.layer.mask = maskLayer
  }
 }
}

這里主要強(qiáng)調(diào)一下動(dòng)畫的新API

iOS10之后U增加一個(gè)新的動(dòng)畫效果API

UIViewPropertyAnimator(duration: 0.4, curve: .easeInOut) {
//這里寫相關(guān)View的操作代碼 。。。eg:下面代碼
    self.cardView.roundCorners(cornerRadius: targetRadius)
    }.startAnimation()

iOS之前可以通過古老的API來實(shí)現(xiàn)

UIView.animate(withDuration: 1.0, delay: 0.0, options: .curveEaseInOut, animations: {
//這里寫相關(guān)View的操作代碼 。。。eg:下面代碼
    self.cardView.roundCorners(cornerRadius: targetRadius)
   }, completion: nil)

最終的效果

iOS中UIView實(shí)現(xiàn)不同方向的導(dǎo)角

總結(jié)

iOS一些簡(jiǎn)單的動(dòng)畫導(dǎo)角比較常用所以記錄下來,以上就是這篇文章的全部?jī)?nèi)容了，希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，如果有疑問大家可以留言交流，謝謝大家對(duì)億速云的支持。

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