如何在倒数计时器中添加年份和月份 Objective C

Question

现在我已经添加了秒和分钟。在我的计时器里。此外，我需要在我的计时器中添加 Hours 月和年，如下图所示：

这是我实现的代码：

    // CountDown Timer
In My view DidLoad I have initialized my variables:
currHour = 1;
currMinute= 3;
currSeconds= 00;

-(void)start {
    timer=[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];

}
-(void)timerFired {
    if((currHour>0 || currHour>=0) && (currMinute>0 || currSeconds>=0) && currMinute>=0) {

        if(currSeconds==0) {
            currMinute-=1;
            currSeconds=59;
        }
        else if(currSeconds>0) {
            currSeconds-=1;
        }
        if(currMinute>-1)
            [self.progress setText:[NSString stringWithFormat:@"%d%@%02d %@",currMinute,@":",currSeconds,@"Sec"]];
    }
    else {
        self.countDownView.hidden = TRUE;
        [timer invalidate];
    }
}

工作到分秒必争。

提前致谢。

Answer 1

添加到 viewDidLoad 下一个代码并将目标日期保存为属性或 ivar

NSTimeInterval currentDateSeconds = [[NSDate date] timeIntervalSince1970];
NSTimeInterval targetDateSeconds = currentDateSeconds + [self secondsInDay:0 hour:1 min:3 sec:0];
targetDate = [NSDate dateWithTimeIntervalSince1970:targetDateSeconds];

然后添加将目标日期转换为秒的方法，例如在你的例子中是 1 小时 3 分钟

- (NSTimeInterval) secondsInDay: (int) day hour:(int)hour min:(int)min sec: (int)sec {
NSTimeInterval secondsInOneDay = 24 * 60 * 60;
return day * secondsInOneDay + hour * 60 * 60 + min * 60 + sec; }

然后使用下一个timeFired方法：

-(void)timerFired {
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *dateComponents = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond) fromDate:[NSDate date] toDate:targetDate options:0];

NSInteger year = dateComponents.year;
NSInteger month = dateComponents.month;
NSInteger day = dateComponents.day;
NSInteger minute = dateComponents.minute;
NSInteger second = dateComponents.second;

if(year == 0 &&
    month == 0 &&
    day == 0 &&
    minute == 0 &&
   second == 0) {
    NSLog(@"FINISH");
    [timer invalidate];
} else {
    NSLog(@"%@", [NSString stringWithFormat:@"%d%@%02d %@",minute,@":",second,@"Sec"]);
}}

Answer 2

如果您对块使用 NSTimer 方法，则不需要存储任何时间变量（或与此相关的计时器），这很简洁：

- (void)startCountdownWithNumberOfSeconds:(NSTimeInterval)seconds {

    __block NSTimeInterval remainingTime = seconds;
    NSCalendar *calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];

    [NSTimer scheduledTimerWithTimeInterval:1.0 repeats:YES block:^(NSTimer *timer) {

        NSDateComponents *components = [calendar components:(NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond)
                                                   fromDate:[NSDate date]
                                                     toDate:[NSDate dateWithTimeIntervalSinceNow:remainingTime--]
                                                    options:kNilOptions];
        NSLog(@"Remaining time: %@", components.description);

        if (remainingTime > 0) {
            self.progress.text = [NSString stringWithFormat:@"%02d:%02d:%02d:%02d", (int)components.day, (int)components.hour, (int)components.minute, (int)components.second];
        }
        else {
            [timer invalidate];
        }
    }];
}

NSCalendar 有很多单位选项，例如 NSCalendarUnitYear 和 NSCalendarUnitMonth，因此您可以在需要时将它们添加到列表中。

如何在倒数计时器中添加年份和月份 Objective C

How to add year and month in count down Timer Objective C

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nstimer

nstimeinterval

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