Swift免费短信验证码实现及动态倒计时功能

#import <SMS_SDK/SMSSDK.h> 

SMSSDK.registerApp(你的appKey withSecret: 你的appSecret) 

// 
// ViewController.swift 
// Yundou 
// 
// Created by Slow on 16/1/2. 
// Copyright (c) 2016年 Ivan. All rights reserved. 
// 
import UIKit 
class ViewController: UIViewController { 
  @IBOutlet weak var getAuthCodeButton: UIButton! 
  //验证码文本框 
  @IBOutlet weak var authCodeText: UITextField! 
  //手机号码文本框 
  @IBOutlet weak var phoneText: UITextField! 
  override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 
  } 
  override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
  } 
  //获取验证码 
  @IBAction func getAuthCode(sender: UIButton) { 
    var phoneNum = phoneText.text 
    SMSSDK.getVerificationCodeByMethod(SMSGetCodeMethodSMS, phoneNumber:phoneNum, zone: "86",customIdentifier: nil,result: {(error: NSError!) ->Void in 
      if(error == nil){ 
        NSLog("发送成功") 
        self.countDown(60) 
      }else{ 
        NSLog("发送失败！%@" , error) 
      } 
    }) 
  } 
  //提交验证码 
  @IBAction func submitAuthCode(sender: UIButton) { 
    var authCode = authCodeText.text 
    var phoneNum = phoneText.text 
    var resultMessage = "" 
    SMSSDK.commitVerificationCode(authCode, phoneNumber: phoneNum, zone: "86" , 
      result:{ (error: NSError!) -> Void in 
        if(error == nil){ 
          resultMessage = "恭喜您，验证成功！" 
          NSLog("验证成功") 
        }else{ 
          resultMessage = "很抱歉，验证失败！" 
          NSLog("验证失败！" , error) 
        } 
        let resultAlertView:UIAlertView = UIAlertView(title: "验证结果", message: resultMessage, delegate: nil, cancelButtonTitle: "确定") 
        resultAlertView.show() 
    }) 
  } 
  //验证码倒计时 
  func countDown(timeOut:Int){ 
    //倒计时时间 
    var timeout = timeOut 
    var queue:dispatch_queue_t = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 
    var _timer:dispatch_source_t = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue) 
    dispatch_source_set_timer(_timer, dispatch_walltime(nil, 0), 1*NSEC_PER_SEC, 0) 
    //每秒执行 
    dispatch_source_set_event_handler(_timer, { () -> Void in 
      if(timeout<=0){ //倒计时结束，关闭 
        dispatch_source_cancel(_timer); 
        dispatch_sync(dispatch_get_main_queue(), { () -> Void in 
          //设置界面的按钮显示 根据自己需求设置 
          self.getAuthCodeButton.setTitle("再次获取", forState: UIControlState.Normal) 
        }) 
      }else{//正在倒计时 
        var seconds = timeout % 60 
        var strTime = NSString.localizedStringWithFormat("%.2d", seconds) 
        dispatch_sync(dispatch_get_main_queue(), { () -> Void in 
//          NSLog("----%@", NSString.localizedStringWithFormat("%@S", strTime) as String) 
          UIView.beginAnimations(nil, context: nil) 
          UIView.setAnimationDuration(1) 
          //设置界面的按钮显示 根据自己需求设置 
          self.getAuthCodeButton.setTitle(NSString.localizedStringWithFormat("%@S", strTime) as String, forState: UIControlState.Normal) 
          UIView.commitAnimations() 
          self.getAuthCodeButton.userInteractionEnabled = false 
        }) 
        timeout--; 
      } 
    }) 
    dispatch_resume(_timer) 
  } 
}