如何检查日期（来自日期选择器）是否在两个其他日期之间？ Objective-C的 [英] How to check if date (from date picker) is between two other dates ? objective-c

问题描述

我正试图从UIDatePicker（MM-dd格式）获取日期并检查它是否在其他两个日期的范围内;

i'm trying to get date from UIDatePicker (MM-dd format) and to check if its in the range of two other dates;

我试过了在很多不同的方式，我认为我的思想已经走得很远:)
有人可以帮助我做到这么简单吗？

i have tried it in so many different ways and i think my mind has gone to far :) can someone help me do it as simple as it should be?

这是我上次尝试的代码：

this is my last try code:

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"MM-dd"];
NSString *theDate = [dateFormat stringFromDate:birthdateSelector.date];
NSDate *birthdate = [dateFormat dateFromString:theDate];

NSString *Capricorn_Start = @"12-22" ;
NSString *Capricorn_End = @"01-19" ;

if ([birthdate laterDate:[dateFormat dateFromString:Capricorn_End]] && [birthdate earlierDate:[dateFormat dateFromString:Capricorn_Start]]){

    NSLog(@"im capricorn");
}

谢谢，
Amir。

Thanks, Amir.

推荐答案

如果你有 dateA ， dateB 和 dateC ，你想要的检查 dateA < dateB < dateC ，您可以获得 dateA-dateB 和 dateB-dateC 之间的区别，它将为您提供 diffX 和 diffY 。如果 diffX 符号等于 diffY 符号，则表示 dateB 位于 A 和 C之间。

If you have dateA, dateB and dateC, and you want to check if dateA < dateB < dateC, you can get the difference between dateA-dateB and dateB-dateC which will give you diffX and diffY. If diffX sign is equal than diffY sign, it will mean that dateB is between A and C.

或者换句话说，您的代码如下所示：

Or, in other words, your code would look like this:

NSTimeInterval diffX = [dateB timeIntervalSinceDate:dateA];
NSTimeInterval diffY = [dateC timeIntervalSinceDate:dateB];

if (signbit(diffX) == signbit(diffY))
{
    // dateB is in-between dateA and dateC
}

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