iOS获取短信验证码倒计时的两种实现方法

方法一：

网上用的很多的一种,不多说，直接上代码.

-(void)starttime{
  __block int timeout= 60; //倒计时时间
  dispatch_queue_t queue = dispatch_get_global_queue(dispatch_queue_priority_default, 0);
  dispatch_source_t _timer = dispatch_source_create(dispatch_source_type_timer, 0, 0,queue);
  dispatch_source_set_timer(_timer,dispatch_walltime(null, 0),1.0*nsec_per_sec, 0); //每秒执行
  dispatch_source_set_event_handler(_timer, ^{
    if(timeout<=0){ //倒计时结束，关闭
      dispatch_source_cancel(_timer);
      dispatch_async(dispatch_get_main_queue(), ^{
        [self.getidentifycodebt settitle:@"获取验证码" forstate:uicontrolstatenormal];
        self.getidentifycodebt.userinteractionenabled = yes;
        [self.getidentifycodebt settitlecolor:theme_red forstate:uicontrolstatenormal];
        self.getidentifycodebt.backgroundcolor = [uicolor whitecolor];
        self.getidentifycodebt.layer.bordercolor = theme_red.cgcolor;
      });
    }else{
      dispatch_async(dispatch_get_main_queue(), ^{

        [uiview beginanimations:nil context:nil];
        [uiview setanimationduration:1];
        [self.getidentifycodebt settitle:[nsstring stringwithformat:@"%zd秒后失效",timeout] forstate:uicontrolstatenormal];
        [self.getidentifycodebt settitlecolor:[uicolor whitecolor] forstate:uicontrolstatenormal];
        self.getidentifycodebt.backgroundcolor = [uicolor lightgraycolor];
        self.getidentifycodebt.layer.bordercolor = [uicolor clearcolor].cgcolor;
        self.getidentifycodebt.clipstobounds = yes;
        [uiview commitanimations];
        self.getidentifycodebt.userinteractionenabled = no;
      });
      timeout--;
    }
  });
  dispatch_resume(_timer);

}

到时直接调用就可以了。

方法二：利用分类

给uibutton新建一个分类

.h文件如下

#import <uikit/uikit.h>

@interface uibutton (xscountdown)
- (void)xs_begincountdownwithduration:(nstimeinterval)duration;
- (void)xs_stopcountdown;
@end

.m文件如下

#import "uibutton+xscountdown.h"

#import "themecolor.h"
static nstimer *_counttimer;
static nstimeinterval _count;
static nsstring *_title;

@implementation uibutton (xscountdown)

- (void)xs_begincountdownwithduration:(nstimeinterval)duration {
  _title = self.titlelabel.text;
  _count = duration;
  _counttimer = [nstimer scheduledtimerwithtimeinterval:1.0 target:self selector:@selector(xs_updatetitle) userinfo:nil repeats:yes];
  [[nsrunloop mainrunloop] addtimer:_counttimer formode:nsrunloopcommonmodes];
  self.userinteractionenabled = no;

   [self settitlecolor:[uicolor whitecolor] forstate:uicontrolstatenormal];
  self.backgroundcolor = [uicolor lightgraycolor];
  self.layer.bordercolor = [uicolor clearcolor].cgcolor;
  self.clipstobounds = yes;
}

- (void)xs_stopcountdown {
  [_counttimer invalidate];
  _counttimer = nil;
  _count = 60.0;
  [self settitle:_title forstate:uicontrolstatenormal];
  self.userinteractionenabled = yes;
}

- (void)xs_updatetitle {
  nsstring *countstring = [nsstring stringwithformat:@"%lis 后失效", (long)_count - 1];
  self.userinteractionenabled = no;
  [self settitle:countstring forstate:uicontrolstatenormal];
  if (_count-- <= 1.0) {
    [self xs_stopcountdown];
    [self settitlecolor:theme_red forstate:uicontrolstatenormal];
    self.backgroundcolor = [uicolor whitecolor];
    self.layer.bordercolor = theme_red.cgcolor;
  }

}

@end

然后在controller里直接调用分类.h文件里的方法就ok了

[self.verifybt xs_begincountdownwithduration:60.0];

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。