iOS 倒计时

+ (void)verificationCode:(void(^)())blockYes blockNo:(void(^)(id time))blockNo

{

//设置倒计时时间

__block int timeout = 60;

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);

dispatch_source_set_event_handler(_timer, ^{

if(timeout <= 0) {

//倒计时结束，关闭

dispatch_source_cancel(_timer);

dispatch_async(dispatch_get_main_queue(), ^{

//设置界面的按钮显示 根据自己需求设置

blockYes();

});

} else {

// int minutes = timeout / 60;

int seconds = timeout % 60;

NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];

dispatch_async(dispatch_get_main_queue(), ^{

//NSLog(@"验证码剩余时间%@",strTime);

blockNo(strTime);

});

timeout--;

}

});

dispatch_resume(_timer);

}

作者：叫我李五

链接：http://www.jianshu.com/p/02393ff08257

來源：

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