如何在 iPhone 上将 NSTimeInterval 分解为年、月、日、小时、分钟和秒?
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11-09-2019 - |
题
我有一个跨越数年的时间间隔,我想要从年到秒的所有时间分量。
我的第一个想法是将时间间隔整数除以一年中的秒数,从运行总秒数中减去该值,将其除以一个月内的秒数,从运行总数中减去该值,依此类推。
这看起来很复杂,我读过,每当你做一些看起来很复杂的事情时,可能有一个内置的方法。
有没有?
我将亚历克斯的第二种方法集成到我的代码中。
它位于我的界面中 UIDatePicker 调用的方法中。
NSDate *now = [NSDate date];
NSDate *then = self.datePicker.date;
NSTimeInterval howLong = [now timeIntervalSinceDate:then];
NSDate *date = [NSDate dateWithTimeIntervalSince1970:howLong];
NSString *dateStr = [date description];
const char *dateStrPtr = [dateStr UTF8String];
int year, month, day, hour, minute, sec;
sscanf(dateStrPtr, "%d-%d-%d %d:%d:%d", &year, &month, &day, &hour, &minute, &sec);
year -= 1970;
NSLog(@"%d years\n%d months\n%d days\n%d hours\n%d minutes\n%d seconds", year, month, day, hour, minute, sec);
当我将日期选择器设置为过去 1 年零 1 天的日期时,我得到:
1年1个月1天16小时0分钟20秒
也就是1个月零16个小时的休息时间。如果我将日期选择器设置为过去 1 天,则会偏离相同的量。
更新: :我有一个应用程序,可以根据您的生日(从 UIDatePicker 设置)计算您的年龄,但它经常关闭。这证明有一个不准确的地方,但我不知道它来自哪里,你能吗?
解决方案
简要描述;简介
这只是完成 JBRWilkinson 答案的另一种方法,但添加了一些代码。它还可以为亚历克斯·雷诺兹的评论提供解决方案。
使用 NSCalendar 方法:
(NSDateComponents *)components:(NSUInteger)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSUInteger)opts
“作为使用指定组件的 NSDateComponents 对象,返回两个提供的日期之间的差异”。(来自 API 文档)。
创建2个NSDate,其差异是你想要分解的NSTimeInterval。(如果您的 NSTimeInterval 来自比较 2 个 NSDate,则不需要执行此步骤,甚至不需要 NSTimeInterval,只需将日期应用于 NSCalendar 方法即可)。
从 NSDateComponents 获取报价
示例代码
// The time interval
NSTimeInterval theTimeInterval = ...;
// Get the system calendar
NSCalendar *sysCalendar = [NSCalendar currentCalendar];
// Create the NSDates
NSDate *date1 = [[NSDate alloc] init];
NSDate *date2 = [[NSDate alloc] initWithTimeInterval:theTimeInterval sinceDate:date1];
// Get conversion to months, days, hours, minutes
NSCalendarUnit unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit;
NSDateComponents *breakdownInfo = [sysCalendar components:unitFlags fromDate:date1 toDate:date2 options:0];
NSLog(@"Break down: %i min : %i hours : %i days : %i months", [breakdownInfo minute], [breakdownInfo hour], [breakdownInfo day], [breakdownInfo month]);
其他提示
此代码是知道的日光节约时间和其他可能讨厌的东西。
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorianCalendar components: (NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit )
fromDate:startDate
toDate:[NSDate date]
options:0];
NSLog(@"%ld", [components year]);
NSLog(@"%ld", [components month]);
NSLog(@"%ld", [components day]);
NSLog(@"%ld", [components hour]);
NSLog(@"%ld", [components minute]);
NSLog(@"%ld", [components second]);
将您的间隔划分为NSDate
使用+dateWithIntervalSince1970
,获取日期分量指出使用NSCalendar
的-componentsFromDate
方法。
从iOS8上和上述可以使用NSDateComponentsFormatter
它的方法来转换在用户友好的格式化串时间差。
NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
formatter.unitsStyle = NSDateComponentsFormatterUnitsStyleFull;
NSLog(@"%@", [formatter stringFromTimeInterval:1623452]);
这给出了输出 - 第2周,4天,18小时,57分钟,32秒
这对我的作品:
float *lenghInSeconds = 2345.234513;
NSDate *date = [NSDate dateWithTimeIntervalSinceReferenceDate:lenghInSeconds];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
[formatter setDateFormat:@"HH:mm:ss"];
NSLog(@"%@", [formatter stringFromDate:date]);
[formatter release];
这里的主要区别是,你需要调整的时区。
或者有我的类方法。它不处理多年,但很容易被addedn虽然它像天,小时和分钟小timelaps更好。它以复数考虑,仅显示所需的内容:
+(NSString *)TimeRemainingUntilDate:(NSDate *)date {
NSTimeInterval interval = [date timeIntervalSinceNow];
NSString * timeRemaining = nil;
if (interval > 0) {
div_t d = div(interval, 86400);
int day = d.quot;
div_t h = div(d.rem, 3600);
int hour = h.quot;
div_t m = div(h.rem, 60);
int min = m.quot;
NSString * nbday = nil;
if(day > 1)
nbday = @"days";
else if(day == 1)
nbday = @"day";
else
nbday = @"";
NSString * nbhour = nil;
if(hour > 1)
nbhour = @"hours";
else if (hour == 1)
nbhour = @"hour";
else
nbhour = @"";
NSString * nbmin = nil;
if(min > 1)
nbmin = @"mins";
else
nbmin = @"min";
timeRemaining = [NSString stringWithFormat:@"%@%@ %@%@ %@%@",day ? [NSNumber numberWithInt:day] : @"",nbday,hour ? [NSNumber numberWithInt:hour] : @"",nbhour,min ? [NSNumber numberWithInt:min] : @"00",nbmin];
}
else
timeRemaining = @"Over";
return timeRemaining;
}
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval];
// format: YYYY-MM-DD HH:MM:SS ±HHMM
NSString *dateStr = [date description];
NSRange range;
// year
range.location = 0;
range.length = 4;
NSString *yearStr = [dateStr substringWithRange:range];
int year = [yearStr intValue] - 1970;
// month
range.location = 5;
range.length = 2;
NSString *monthStr = [dateStr substringWithRange:range];
int month = [monthStr intValue];
// day, etc.
...
- (NSString *)convertTimeFromSeconds:(NSString *)seconds {
// Return variable.
NSString *result = @"";
// Int variables for calculation.
int secs = [seconds intValue];
int tempHour = 0;
int tempMinute = 0;
int tempSecond = 0;
NSString *hour = @"";
NSString *minute = @"";
NSString *second = @"";
// Convert the seconds to hours, minutes and seconds.
tempHour = secs / 3600;
tempMinute = secs / 60 - tempHour * 60;
tempSecond = secs - (tempHour * 3600 + tempMinute * 60);
hour = [[NSNumber numberWithInt:tempHour] stringValue];
minute = [[NSNumber numberWithInt:tempMinute] stringValue];
second = [[NSNumber numberWithInt:tempSecond] stringValue];
// Make time look like 00:00:00 and not 0:0:0
if (tempHour < 10) {
hour = [@"0" stringByAppendingString:hour];
}
if (tempMinute < 10) {
minute = [@"0" stringByAppendingString:minute];
}
if (tempSecond < 10) {
second = [@"0" stringByAppendingString:second];
}
if (tempHour == 0) {
NSLog(@"Result of Time Conversion: %@:%@", minute, second);
result = [NSString stringWithFormat:@"%@:%@", minute, second];
} else {
NSLog(@"Result of Time Conversion: %@:%@:%@", hour, minute, second);
result = [NSString stringWithFormat:@"%@:%@:%@",hour, minute, second];
}
return result;
}
下面是另一种可能性,有些清洁器:
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval];
NSString *dateStr = [date description];
const char *dateStrPtr = [dateStr UTF8String];
// format: YYYY-MM-DD HH:MM:SS ±HHMM
int year, month, day, hour, minutes, seconds;
sscanf(dateStrPtr, "%d-%d-%d %d:%d:%d", &year, &month, &day, &hour, &minutes, &seconds);
year -= 1970;