在Ios注冊時候會需要一個發送驗證碼倒計時的需求.
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(handleMaxShowTimer:) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
/*計時器方法*/
-(void)handleMaxShowTimer:(NSTimer *)theTimer{
repeatCount--;
NSString *timerText = [NSString stringWithFormat:@"%d",repeatCount];
UIButton *tokenBtn = self.clickCodeButton;
[tokenBtn setTitle:timerText forState:UIControlStateNormal];
tokenBtn.enabled = NO;
NSLog(@"%@", tokenBtn.titleLabel.text);
if (repeatCount==0) {
repeatCount = 60;
[timer invalidate];
timer = nil;
tokenBtn.enabled = YES;
[tokenBtn setTitle:@"驗證碼" forState:UIControlStateNormal];
}
}
在支付的時候我們會遇到半小時后不支付,重置時間,下面就寫了一個半小時倒計時
- (void)secondsCountDown:(UILabel *)label
{
__block int timeout = 1800;
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);//每秒執行
dispatch_source_set_event_handler(_timer, ^{
if (timeout<=0) {
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"計時結束");
});
}else {
int minutes = timeout/60;
int seconds = timeout%60;
NSString *strTime = [NSString stringWithFormat:@"%d 分鍾 %d 秒", minutes, seconds];
dispatch_async(dispatch_get_main_queue(), ^{
label.text = [NSString stringWithFormat:@"支付剩余時間 %@",strTime];
});
timeout--;
}
});
dispatch_resume(_timer);
}