文章图片
CountDown.png
// 全局
{
dispatch_source_t_timer;
}
#pragma mark 倒计时
- (void)countdownFromTimeString:(NSString *)timeString
{
if (!_timer) {
// 倒计时时间
__block int timeout = timeString?[timeString intValue]:0;
if (timeout!=0) {
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);
//每秒执行
dispatch_source_set_event_handler(_timer, ^{
if (timeout<=0) {
dispatch_source_cancel(_timer);
_timer = nil;
dispatch_async(dispatch_get_main_queue(), ^{
_dayLabel.text = @"00";
_hourLabel.text = @"00";
_minuteLabel.text = @"00";
_secondLabel.text = @"00";
});
}else{
int days = (int)(timeout/(3600*24));
if (days==0) {
_dayLabel.text = @"00";
}
int hours = (int)((timeout-days*24*3600)/3600);
int minute = (int)(timeout-days*24*3600-hours*3600)/60;
int second = timeout-days*24*3600-hours*3600-minute*60;
dispatch_async(dispatch_get_main_queue(), ^{
_dayLabel.text = [NSString stringWithFormat:@"%0*d",2, days];
_hourLabel.text = [NSString stringWithFormat:@"%02d", hours];
_minuteLabel.text = [NSString stringWithFormat:@"%02d", minute];
_secondLabel.text = [NSString stringWithFormat:@"%02d", second];
});
timeout--;
}
});
dispatch_resume(_timer);
}
}
}
