iOS 验证码按钮倒计时

 

在app 注册或者登录 需要验证码的地方、为了避免短时间内刷验证码、往往会加上一层验证。

 

倒计时结束后、可以重新获取!

 

代码实现如下:

 


// _CountdownTime 倒计时总时间;
//_timer 定时器

- (void)startTime:(UIButton *)VerificationCodeButton { __block NSInteger timeout = [_CountdownTime integerValue]; dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); _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); dispatch_source_set_event_handler(_timer, ^{ if(timeout<=0){ dispatch_source_cancel(_timer); dispatch_async(dispatch_get_main_queue(), ^{ [VerificationCodeButton setTitle:@"重新获取" forState:UIControlStateNormal]; VerificationCodeButton.userInteractionEnabled = YES; VerificationCodeButton.alpha = 1.0; VerificationCodeButton.backgroundColor = [UIColor whiteColor]; }); } else { NSString *strTime = [NSString stringWithFormat:@"%lds", (long)timeout]; dispatch_async(dispatch_get_main_queue(), ^{ [VerificationCodeButton setTitle:strTime forState:UIControlStateNormal]; VerificationCodeButton.userInteractionEnabled = NO; VerificationCodeButton.backgroundColor = [UIColor lightTextColor]; }); timeout--; } }); dispatch_resume(_timer); }

 

posted @ 2017-07-26 11:49  鸿鹄当高远  阅读(583)  评论(0编辑  收藏  举报