验证码倒计时按钮的应用是非常普遍的，该blog就和你一起来实现验证码倒计时的效果，定义一个发送验证码的按钮，添加点击事件，具体内容如下
具体代码：
定义一个发送验证码的按钮，添加点击事件
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//发送验证码按钮
_sentcodebtn = [[uibutton alloc] initwithframe:cgrectmake(kscreenwidth - 27 - 4 - 94, cgrectgetminy(_registercodefd.frame) + 4, 94, 40)];
[_sentcodebtn setbackgroundcolor:colorwithrgba(0, 191, 191, 0.9)];
[_sentcodebtn settitle:@"发送验证码" forstate:uicontrolstatenormal];
[_sentcodebtn.titlelabel setfont:[uifont systemfontofsize:13.0f]];
//设置圆角
[_sentcodebtn.layer setcornerradius:3.0f];
[_sentcodebtn.layer setshouldrasterize:yes];
[_sentcodebtn.layer setrasterizationscale:[uiscreen mainscreen].scale];
//发送事件
[_sentcodebtn addtarget:self action:@selector(sentcodemethod) forcontrolevents:uicontroleventtouchupinside];
[self.view addsubview:_sentcodebtn];
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监听事件：
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//发送验证码
-(void)sentcodemethod{
nslog(@"发送验证码。。");
//计时器发送验证码
[self sentphonecodetimemethod];
//调用发送验证码接口-》
}
//计时器发送验证码
-(void)sentphonecodetimemethod{
//倒计时时间 - 60秒
__block nsinteger timeout = 59;
//执行队列
dispatch_queue_t queue = dispatch_get_global_queue(dispatch_queue_priority_default, 0);
//计时器 -》dispatch_source_set_timer自动生成
dispatch_source_t timer = dispatch_source_create(dispatch_source_type_timer, 0, 0, queue);
dispatch_source_set_timer(timer, dispatch_time_now, 1.0 * nsec_per_sec, 0 * nsec_per_sec);
dispatch_source_set_event_handler(timer, ^{
if (timeout <= 0) {
dispatch_source_cancel(timer);
//主线程设置按钮样式-》
dispatch_async(dispatch_get_main_queue(), ^{
[_sentcodebtn settitle:@"发送验证码" forstate:uicontrolstatenormal];
[_sentcodebtn setuserinteractionenabled:yes];
});
}else{
//开始计时
//剩余秒数 seconds
nsinteger seconds = timeout % 60;
nsstring *strtime = [nsstring stringwithformat:@"%.1ld",seconds];
//主线程设置按钮样式
dispatch_async(dispatch_get_main_queue(), ^{
[uiview beginanimations:nil context:nil];
[uiview setanimationduration:1.0];
[_sentcodebtn settitle:[nsstring stringwithformat:@"%@s后重新发送",strtime] forstate:uicontrolstatenormal];
[uiview commitanimations];
//计时器件不允许点击
[_sentcodebtn setuserinteractionenabled:no];
});
timeout--;
}
});
dispatch_resume(timer);
}
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以上就是本文的全部内容，希望对大家的学习有所帮助。