開(kāi)發(fā)中不可避免會(huì)用到注冊(cè)獲取驗(yàn)證碼，在驗(yàn)證碼定時(shí)器使用方面別出心裁，各有妙招，今天推薦一個(gè)比較實(shí)用的定時(shí)器使用方法，特做了一個(gè)封裝。

//  KTimeCountDown.swift

import UIKit

//設(shè)置一個(gè)靜態(tài)的時(shí)間范圍，以便更改
private let kCodeTime = 60

class KTimeCountDown {
    //定義一個(gè)私有定時(shí)器變量
    private var codeTimer: Timer?
    //初始化一個(gè)UIButton供外部使用及定時(shí)器時(shí)間處理
    var codeBtn = UIButton()
    
    //定義一個(gè)定時(shí)剩余時(shí)間， 默認(rèn)為0
    private var countDownTime: Int = 0 {
        willSet{
            //事件不為0 isCountDown的狀態(tài)始終未true
            codeBtn.setTitle("重新獲取\(newValue)秒", for: .normal)
            //事件小于等于0 isCountDown的狀態(tài)改變 按鈕重置
            if newValue <= 0 {
                codeBtn.setTitle("獲取驗(yàn)證碼", for: .normal)
                isCountDown = false
            }
        }
    }
    
    //定義一個(gè) 是否正在倒計(jì)時(shí)的狀態(tài)
    var isCountDown = false {
        willSet {
            if newValue {
                //創(chuàng)建定時(shí)器
                codeTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(countDownTimeAction), userInfo: nil, repeats: true)
                countDownTime = kCodeTime
                codeBtn.setTitleColor(UIColor.lightGray, for: .normal)
            } else {
                //如果isCountDown為false ,銷毀定時(shí)器
                codeTimer?.invalidate()
                codeTimer = nil
                //按鈕狀態(tài)改變 重置
                codeBtn.setTitleColor(UIColor.brown, for: .normal)
                codeBtn.setTitle("獲取驗(yàn)證碼", for: .normal)
            }
            //如果isCountDown為true ,禁用按鈕事件
            codeBtn.isEnabled = !newValue
        }
    }
    
    
    @objc private func countDownTimeAction() {
        countDownTime -= 1
    }
    
}

使用方法

import UIKit
import SnapKit

class RegisterViewController: UIViewController {

    var countDown = KTimeCountDown()//實(shí)例化

    var codeBtn = UIButton()//初始化
    
    
    override func viewDidLoad() {
        super.viewDidLoad()

        
        
        //不帶參
//        codeBtn.addTarget(self, action: #selector(codeBtnClick) for: .touchUpInside)
        codeBtn.addTarget(self, action: #selector(codeBtnClick(_:)), for: .touchUpInside)
        view.addSubview(codeBtn)
        codeBtn.snp.makeConstraints { (make) in
            make.center.equalTo(self.view);
            make.width.equalTo(200)
            make.height.equalTo(40)
        }
        //賦值
        countDown.codeBtn = codeBtn
        codeBtn.setTitle("獲取驗(yàn)證碼", for: .normal)
        codeBtn.setTitleColor(UIColor.brown, for: .normal)
        
        
    }

    //開(kāi)啟定時(shí)器
    func codeBtnClick(_ sender: UIButton){
        //只需要調(diào)此方法
        countDown.isCountDown = true
    }
    
    //取消定時(shí)器
    @IBAction func backBtnClick(_ sender: Any) {
        //只需要調(diào)此方法
        countDown.isCountDown = false
        
        
    }

}