Swift - 输入框抖动效果的实现（扩展UIView、支持所有UI组件）

1、ExtensionUIView.swift

import UIKit

public enum ShakeDirection: Int
{
    case horizontal
    case vertical
}

extension UIView
{
    // MARK: - 扩展UIView,增加抖动方法
    ///
    /// - Parameters:
    ///   - direction: 抖动方向（默认是水平方向）
    ///   - times: 抖动次数（默认5次）
    ///   - interval: 每次抖动时间（默认0.1秒）
    ///   - delta: 抖动偏移量（默认2）
    ///   - completion: 抖动动画结束后的回调
    public func shake(direction: ShakeDirection = .horizontal, times: Int = 5, interval: TimeInterval = 0.1, delta: CGFloat = 2, completion: (() -> Void)? = nil)
    {
        UIView.animate(withDuration: interval, animations: { 
            
            switch direction
            {
            case .horizontal:
                self.layer.setAffineTransform(CGAffineTransform(translationX: delta, y: 0))
            case .vertical:
                self.layer.setAffineTransform(CGAffineTransform(translationX: 0, y: delta))
            }
        }) { (finish) in
            
            if times == 0
            {
                UIView.animate(withDuration: interval, animations: { 
                    self.layer.setAffineTransform(CGAffineTransform.identity)
                }, completion: { (finish) in
                    completion?()
                })
            }
            else
            {
                self.shake(direction: direction, times: times - 1, interval: interval, delta: -delta, completion: completion)
            }
        }
    }  
}

2、使用

import UIKit

class ViewController: UIViewController
{
    
    @IBOutlet weak var inputTextField: UITextField!
    
    @IBAction func horizontalShakeButtonTap(_ sender: UIButton)
    {
        inputTextField.shake { 
            print("水平抖动结束")
        }
    }
    
    @IBAction func verticalShakeButtonTap(_ sender: UIButton)
    {
        inputTextField.shake(direction: .vertical, times: 4, interval: 0.1, delta: 1.8) { 
            print("垂直抖动结束")
        }
    }

    override func viewDidLoad()
    {
        super.viewDidLoad()
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

整理自：航歌