存储“时间”的最佳方式价值

发布于 2024-10-02 17:08:57 字数 139 浏览 7 评论 0原文

我的类需要两个属性:startTimeendTime。最好使用什么类?我知道有 NSDate,但我只需要存储一个特定时间(00:00-23:59 之间的某个时间),我不需要日期。这里最优雅的解决方案是什么?

My class needs two properties: startTime and endTime. What is the best class to use? I know there is NSDate, but I only need to store a specific time (something in between 00:00-23:59), I don't need a date. What is the most elegant solution here?

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终遇你 2024-10-09 17:08:57

NSTimeInterval 可能已经足够了。

它将以秒为单位的时间值存储为双精度值。

例如。 5 分钟 = 300.0

NSTimeInterval is probably good enough for this.

It stores a time value in seconds as a double.

Eg. 5 mins = 300.0

(り薆情海 2024-10-09 17:08:57

我相信最优雅的解决方案,也是您想要的,是 NSTimeInterval,这是 NSDate 构建于其之上的原始类型。

NSTimeIntervaldouble 的类型定义,是以秒为单位的时间度量。这种原始时间类型没有任何参考日期的概念。 NSDate 所做的就是添加参考日期的概念,并将 0.0 时间锚定在 2001 年 1 月 1 日 GMT。没有什么可以阻止您发明自己的参考日期锚点,例如“无论哪一天的午夜”

您可以做的是添加 NSTimeInterval 的两个属性作为 startTimeendTime 并让它们都使用午夜 作为参考。或者您可以跳过 endTime 并选择 startTimeduration 组合。

I believe the most elegant solution, and what you want, is NSTimeInterval, that is the primitive type that NSDate is built on top.

NSTimeInterval is a typedef for double, and is a measurement of time in seconds. This primitive time type do not have any concept of a reference date. What NSDate do is to add this concept of reference date and anchor the 0.0 time at 1 January 2001 GMT. There is nothing that stops you from inventing your own reference date or anchor, like for example "midnight of whatever day there is".

What you can do is to add two properties of the NSTimeInterval either as startTime and endTime and let them both use midnight as the reference. Or you could skip endTime and go for a startTime and duration combo.

七颜 2024-10-09 17:08:57

NSDateComponents< /code>,“也可用于指定持续时间,例如 5 小时 16 分钟”。

There's NSDateComponents, which "can also be used to specify a duration of time, for example, 5 hours and 16 minutes."

多情癖 2024-10-09 17:08:57

NSDate 类与 C# 中的 DateTime 类类似:都保存日期和时间,但它们可以彼此独立。在 Cocoa 中,您可以比较两个 NSDate 类:

//Create NSDate objects in the time format
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"HH:mm:ss"];
NSString *startTimeString = @"00:00:00"; //0 seconds
NSString *endTimeString = @"00:00:52"; //52 seconds
NSDate *startTime = [dateFormatter dateFromString:startTimeString];
NSDate *endTime = [dateFormatter dateFromString:endTimeString];

//Compare the time
BOOL date1before2 = [startTime compare:endTime] == NSOrderedAscending;

The NSDate class is similar to the DateTime class in C#: both hold a date and time, but they can be independent of each other. In Cocoa, you would compare two NSDate classes:

//Create NSDate objects in the time format
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"HH:mm:ss"];
NSString *startTimeString = @"00:00:00"; //0 seconds
NSString *endTimeString = @"00:00:52"; //52 seconds
NSDate *startTime = [dateFormatter dateFromString:startTimeString];
NSDate *endTime = [dateFormatter dateFromString:endTimeString];

//Compare the time
BOOL date1before2 = [startTime compare:endTime] == NSOrderedAscending;
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