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我正在尝试制作一个计数器,显示距离我们去欧洲旅行的天数。只有大约 70 天(截至今天),所以我不相信我应该担心天文数字或任何事情,但我真的很难过 - 我附上了一些朋友给我的代码,它没有也不行。当我说我已经尝试了我能想到的所有东西时,请相信我——在任何人咬我的头之前,我已经在这些论坛上看到过,是的,我确实非常广泛地查看了 Apple 文档,但我不是 100%确定从哪里开始——我已经尝试过 NSTimer、NSDate 以及它们的所有子类和方法,但没有什么可以立即跳出来。

[NSDate date]就我认为我实际上应该做的事情而言,我认为我需要以某种方式为今天/现在/当天的“天”分配一个整数值,它将使用离开。倒计时只是在再次调用该方法时更新(如果需要,我可以使用 NSTimer 执行此操作),倒计时显示的值是这两个值之间的差异。

在我们离开之前,我并不特别希望有一种每秒更新一次的闪烁的东西——我个人认为这很俗气,但如果有人知道怎么做,我会很感激它以供将来参考。

我还对谷歌进行了广泛的搜索,我可能只是使用了错误的搜索词,但我也找不到任何东西。

任何帮助是极大的赞赏。

非常感谢。

迈克尔jvdw

- (void)countDownMethod {
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:startDay];
[comps setMonth:startMonth];
[comps setYear:startYear];
[comps setHour:startHour];

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date = [gregorian dateFromComponents:comps];
NSLog(@"%@",date);
[gregorian release];
[comps release];
NSTimeInterval diff = [date timeIntervalSinceNow];

int diffInt = diff;

NSString *days = [NSString stringWithFormat:@"%d",diffInt/86400];
day0.text = @"0";   
day1.text = @"0";
day2.text = @"0";
NSLog(@"Days Length: %d",days.length);

if(days.length >= 1){
    day2.text = [days substringFromIndex:days.length - 1];

    if(days.length >= 2){
        day1.text = [days substringWithRange:NSMakeRange(days.length - 2, 1)];

        if(days.length >= 3){
            day0.text = [days substringWithRange:NSMakeRange(days.length - 3, 1)];
        }
    }
}

NSString *hours = [NSString stringWithFormat:@"%d",(diffInt%86400)/3600];
hour0.text = @"0";
hour1.text = @"0";
NSLog(@"Hours Length: %d",hours.length);

if(hours.length >= 1){
    hour1.text = [hours substringFromIndex:hours.length - 1];

    if(hours.length >= 2){
        hour0.text = [hours substringWithRange:NSMakeRange(hours.length - 2, 1)];
    }
}
NSString *minutes = [NSString stringWithFormat:@"%d",((diffInt%86400)%3600)/60];
minute0.text = @"0";
minute1.text = @"0";
NSLog(@"Minutes Length: %d",minutes.length);

if(minutes.length >= 1){
    minute1.text = [minutes substringFromIndex:minutes.length - 1];

    if(minutes.length >= 2){
        minute0.text = [minutes substringWithRange:NSMakeRange(minutes.length - 2, 1)];
    }
}

}

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2 回答 2

4

如果您知道两个日期之间的秒数(您的 NSTimeInterval),那么您可以轻松地将其转换为格式为 days:hours:mins:secs 的字符串,如下所示。

- (NSString*)secsToDaysHoursMinutesSecondsString:(NSTimeInterval)theSeconds {
div_t r1 = div(theSeconds, 60*60*24);
NSInteger theDays = r1.quot;
NSInteger secsLeftFromDays = r1.rem;

div_t r2 = div(secsLeftFromDays, 60*60);
NSInteger theHours = r2.quot;
NSInteger secsLeftFromHours = r2.rem;

div_t r3 = div(secsLeftFromHours, 60);
NSInteger theMins = r3.quot;
NSInteger theSecs = r3.rem;

NSString* days;
if (theDays < 10) { // make it 2 digits
    days = [NSString stringWithFormat:@"0%i", theDays];
} else {
    days = [NSString stringWithFormat:@"%i", theDays];
}

NSString* hours;
if (theHours < 10) { // make it 2 digits
    hours = [NSString stringWithFormat:@"0%i", theHours];
} else {
    hours = [NSString stringWithFormat:@"%i", theHours];
}

NSString* mins;
if (theMins < 10) { // make it 2 digits
    mins = [NSString stringWithFormat:@"0%i", theMins];
} else {
    mins = [NSString stringWithFormat:@"%i", theMins];
}

NSString* secs;
if (theSecs < 10) { // make it 2 digits
    secs = [NSString stringWithFormat:@"0%i", theSecs];
} else {
    secs = [NSString stringWithFormat:@"%i", theSecs];
}

return [NSString stringWithFormat:@"%@:%@:%@:%@", days, hours, mins,secs];
}
于 2010-07-05T09:11:10.647 回答
2
    //Another simple way  to get the numbers of days difference to a future day from today.

NSTimeInterval todaysDiff = [todayDate timeIntervalSinceNow];
NSTimeInterval futureDiff = [futureDate timeIntervalSinceNow];
NSTimeInterval dateDiff = futureDiff - todaysDiff;

div_t r1 = div(dateDiff, 60*60*24);
NSInteger theDays = r1.quot;

label.text = [NSString stringWithFormat:@"%i", theDays];
于 2011-02-25T12:08:49.613 回答