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
//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：
//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。
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