倒计时

作者: LiwaySun | 来源:发表于2017-09-06 22:49 被阅读3次
    • (void)viewDidLoad {
      [super viewDidLoad];

      NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
      [dateFormatter setDateFormat:@"yyyy-MM-dd"];

      NSDate *endDate = [dateFormatter dateFromString:[self getyyyymmdd]];
      NSDate endDate_tomorrow = [[NSDate alloc] initWithTimeIntervalSinceReferenceDate:([endDate timeIntervalSinceReferenceDate] + 243600)];
      NSDate *startDate = [NSDate date];
      NSTimeInterval timeInterval =[endDate_tomorrow timeIntervalSinceDate:startDate];

      if (_timer==nil) {
      __block int timeout = timeInterval; //倒计时时间

        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){ //倒计时结束,关闭
                    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);
        }
      

      }
      }

    -(NSString *)getyyyymmdd{
    NSDate *now = [NSDate date];
    NSDateFormatter *formatDay = [[NSDateFormatter alloc] init];
    formatDay.dateFormat = @"yyyy-MM-dd";
    NSString *dayStr = [formatDay stringFromDate:now];

    return dayStr;
    

    }

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          本文标题:倒计时

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