NSTimer天倒計時和發送到標籤

Question

我有一個按鈕觸發NSTimer倒計時3天。如何在tableviewCell中顯示剩餘2天或0天的標籤。並且我還想在剩下0天時用紅色對單元格着色。並在單元格中有一個按鈕來重置計時器另外3天。 Objective-C的。提前致謝！

Answer 1

在用戶默認值中存儲定時器過期日期。這可以通過IBAction方法來設置新的過期日期。再次運行此操作會重置該值。

NSInteger expiredInDays = 3; 

// Calculate the Date. 
// Get the Date 
NSDate * now = [NSDate date]; 
NSTimeInterval tiNow = [now timeIntervalSinceReferenceDate]; 
tiNow = tiNow + 60*60*24*expiredInDays; 
NSDate * expires = [NSDate dateWithTimeIntervalSinceReferenceDate:tiNow]; 
[[NSUserDefaults standardUserDefaults] setObject:expires forKey:@"Expired Date"]; 

要求即將到期的日期，您需要在代碼中使用它。

NSDate *expiredDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"Expired Date"]; 
NSLog(@"Expires in: %@",expiredDate); 

Answer 2

的答案是這樣的：

- (IBAction)In3DaysButton:(id)sender 
    { 
    NSInteger expiredInDays = 4; 

    // Calculate the Date. 
    // Get the Date 

    NSDate * now = [NSDate date]; 

    NSTimeInterval tiNow = [now timeIntervalSinceReferenceDate]; 
    tiNow = tiNow + 60*60*24*expiredInDays; 
    NSDate * expires = [NSDate dateWithTimeIntervalSinceReferenceDate:tiNow]; 

    NSDateComponents *countdown = [[NSCalendar currentCalendar] 
           components:(NSCalendarUnitDay) 
              // | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond) 
           fromDate:[NSDate date] 
           toDate:expires 
           options:0]; 

    NSString *myDays = [NSString stringWithFormat:@"%ld", (long)[countdown day]]; 

    [[NSUserDefaults standardUserDefaults] setObject:myDays forKey:@"Expired_Date"]; 

}

後來，當我想要得到它：

NSDate *expiredDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"Expired_Date"]; 
    doItLabel.text = [NSString stringWithFormat:@" f_ck me in %@ day(s)", expiredDate]; 

    //And for coloring label I add after 

    if ([NSDate date] > expiredDate) doItLabel.textColor = [UIColor redColor];