iOS开发 倒计时
[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFireMethod:) userInfo:nil repeats:YES];
- (void)timerFireMethod:(NSTimer*)theTimer{ id obj = [theTimer userInfo]; NSDateFormatter *f1 = [[NSDateFormatter alloc] init]; [f1 setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSDate *theDay = [f1 dateFromString:(NSString*)obj]; // [f1 release]; NSCalendar *cal = [NSCalendar currentCalendar];//定义一个NSCalendar对象 NSDate *today = [NSDate date];//得到当前时间 //用来得到具体的时差 unsigned int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *d = [cal components:unitFlags fromDate:today toDate:theDay options:0]; NSString *countdown = [NSString stringWithFormat:@"%d年%d月%d日%d时%d分%d秒", [d year],[d month],[d day], [d hour], [d minute], [d second]]; NSLog(@"countDowm== %@",countdown); // self.timeLabel.text = countdown; }
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