倒計時5分鐘
@interface ViewController ()
{
dispatch_source_t _timer;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSDate *endDate = [[NSDate alloc] initWithTimeInterval:5*60 sinceDate:[NSDate date]];
NSDate *startDate = [NSDate date];
NSTimeInterval timeInterval =[endDate timeIntervalSinceDate:startDate];
if (_timer==nil) {
__block int timeout = timeInterval; //倒計時時間
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); //每秒執行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){ //倒計時結束
dispatch_source_cancel(_timer);
_timer = nil;
dispatch_async(dispatch_get_main_queue(), ^{
self.dayLabel.text = @"";
self.hourLabel.text = @"00";
self.minuteLabel.text = @"00";
self.secondLabel.text = @"00";
});
}else{
int days = (int)(timeout/(3600*24));
if (days==0) {
self.dayLabel.text = @"";
}
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(), ^{
if (days==0) {
self.dayLabel.text = @"0天";
}else{
self.dayLabel.text = [NSString stringWithFormat:@"%d天",days];
}
if (hours<10) {
self.hourLabel.text = [NSString stringWithFormat:@"0%d",hours];
}else{
self.hourLabel.text = [NSString stringWithFormat:@"%d",hours];
}
if (minute<10) {
self.minuteLabel.text = [NSString stringWithFormat:@"0%d",minute];
}else{
self.minuteLabel.text = [NSString stringWithFormat:@"%d",minute];
}
if (second<10) {
self.secondLabel.text = [NSString stringWithFormat:@"0%d",second];
}else{
self.secondLabel.text = [NSString stringWithFormat:@"%d",second];
}
});
timeout--;
}
});
dispatch_resume(_timer);
}
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end