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
|
1
2
3
4
5
6
7
8
9
10
11
12
|
//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]; |
监听事件：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
//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);} |
以上就是本文的全部内容，希望对大家的学习有所帮助。
