blocks|key|3101609|text|一旦有了NSDate，就可以使用initWithKey:ascending:创建一个NSSortDescriptor，然后使用sortedArrayUsingDescriptors:进行排序。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3101610|entityMap^0|4|6|G|M|16|G|1R|S|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

Once you have an <code>NSDate</code>, you can create an <code>NSSortDescriptor</code> with <code>initWithKey:ascending:</code> and then use <code>sortedArrayUsingDescriptors:</code> to do the sorting.

blocks|key|3101612|text|您可以使用sortedArrayUsingFunction:context:。下面是一个示例：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3101613|NSComparisonResult+dateSort(NSString+*s1,+NSString+*s2,+void+*context)+{
++++NSDate+*d1+=+[NSDate+dateWithString:s1];
++++NSDate+*d2+=+[NSDate+dateWithString:s2];
++++return+[d1+compare:d2];
}

NSArray+*sorted+=+[unsorted+sortedArrayUsingFunction:dateSort+context:nil];|code-block|syntax|javascript|3101614|在使用NSMutableArray时，您可以使用sortArrayUsingFunction:context:。|3101615|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/foundation/nsmutablearray/1408332-sortusingfunction?language=objc|1|https://developer.apple.com/documentation/foundation/nsarray/1408213-sortedarrayusingfunction?language=objc^0|5|X|5|X|0|0|0|3|E|O|V|O|V|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|M|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

You can use <a href="https://developer.apple.com/documentation/foundation/nsmutablearray/1408332-sortusingfunction?language=objc" rel="nofollow noreferrer"><code>sortedArrayUsingFunction:context:</code></a>. Here is a sample:

<pre><code>NSComparisonResult dateSort(NSString *s1, NSString *s2, void *context) {
 NSDate *d1 = [NSDate dateWithString:s1];
 NSDate *d2 = [NSDate dateWithString:s2];
 return [d1 compare:d2];
}

NSArray *sorted = [unsorted sortedArrayUsingFunction:dateSort context:nil];
</code></pre>

When using a <code>NSMutableArray</code>, you can use <a href="https://developer.apple.com/documentation/foundation/nsarray/1408213-sortedarrayusingfunction?language=objc" rel="nofollow noreferrer"><code>sortArrayUsingFunction:context:</code></a> instead.

blocks|key|336947|text|将日期作为NSDate对象存储在NS(可变)数组中，然后使用[-[NSArray+sortedArrayUsingSelector:](https://developer.apple.com/documentation/foundation/nsarray/1410025-sortedarrayusingselector?language=objc)或-[NSMutableArray+sortUsingSelector:]并将dates作为参数传递。-[NSDate+compare:]方法将为您以升序排列日期。这比创建NSSortDescriptor更简单，也比编写自己的比较函数简单得多。(NSDate对象知道如何相互比较，至少与我们希望通过自定义代码实现的效率一样高。)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|336948|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/foundation/nsarray/1410025-sortedarrayusingselector?language=objc|1|https://developer.apple.com/documentation/foundation/nsmutablearray/1412273-sortusingselector?language=objc|2|https://developer.apple.com/documentation/foundation/nsdate/1409748-compare?language=objc^0|5|6|V|Z|4X|10|6B|I|7A|G|8B|6|1W|2Z|0|4X|10|1|6B|I|2|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@$9|14|A|15|1|16]|$9|17|A|18|1|19]|$9|1A|A|1B|1|1C]]|E|$]]|$1|F|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]|P|$5|I|J|K|E|$L|Q]]]]

Store the dates as <code>NSDate</code> objects in an NS(Mutable)Array, then use <a href="https://developer.apple.com/documentation/foundation/nsarray/1410025-sortedarrayusingselector?language=objc" rel="noreferrer"><code>-[NSArray sortedArrayUsingSelector:</code></a> or <a href="https://developer.apple.com/documentation/foundation/nsmutablearray/1412273-sortusingselector?language=objc" rel="noreferrer"><code>-[NSMutableArray sortUsingSelector:]</code></a> and pass <code>@selector(compare:)</code> as the parameter. The <a href="https://developer.apple.com/documentation/foundation/nsdate/1409748-compare?language=objc" rel="noreferrer"><code>-[NSDate compare:]</code></a> method will order dates in ascending order for you. This is simpler than creating an <code>NSSortDescriptor</code>, and much simpler than writing your own comparison function. (<code>NSDate</code> objects know how to compare themselves to each other at least as efficiently as we could hope to accomplish with custom code.)

blocks|key|336950|text|如果我有一个带有NSDate类型字段"beginDate“的对象的NSMutableArray，我使用的NSSortDescriptor如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|336951|NSSortDescriptor+*sortDescriptor+=+[[NSSortDescriptor+alloc]+initWithKey:@"beginDate"+ascending:TRUE];
[myMutableArray+sortUsingDescriptors:[NSArray+arrayWithObject:sortDescriptor]];
[sortDescriptor+release];|code-block|syntax|javascript|336952|entityMap^0|8|6|X|E|1G|G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

If I have an <code>NSMutableArray</code> of objects with a field "beginDate" of type <code>NSDate</code> I am using an <code>NSSortDescriptor</code> as below:

<pre><code>NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"beginDate" ascending:TRUE];
[myMutableArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
[sortDescriptor release];
</code></pre>

blocks|key|335944|text|您可以使用块进行就地排序：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335945|sortedDatesArray+=+[[unsortedDatesArray+sortedArrayUsingComparator:+%5E(id+a,+id+b)+{
++++NSDate+*d1+=+[NSDate+dateWithString:+s1];
++++NSDate+*d2+=+[NSDate+dateWithString:+s2];
++++return+[d1+compare:+d2];
}];|code-block|syntax|javascript|335946|我建议您在排序前将所有字符串转换为日期，这样转换的次数不要超过日期项的次数。任何排序算法都会给出比数组中的项数更多的字符串到日期的转换(有时要多得多)。|335947|关于块排序的更多信息：http://sokol8.blogspot.com/2011/04/sorting-nsarray-with-blocks.html|offset|length|335948|entityMap|0|LINK|mutability|MUTABLE|url|http://sokol8.blogspot.com/2011/04/sorting-nsarray-with-blocks.html^0|0|0|0|B|1V|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

You can use blocks to sort in place:

<pre><code>sortedDatesArray = [[unsortedDatesArray sortedArrayUsingComparator: ^(id a, id b) {
 NSDate *d1 = [NSDate dateWithString: s1];
 NSDate *d2 = [NSDate dateWithString: s2];
 return [d1 compare: d2];
}];
</code></pre>

I suggest you convert all your strings to dates before sorting not to do the conversion more times than there are date items. Any sorting algorithm will give you more string to date conversions than the number of items in the array (sometimes substantially more)

a bit more on blocks sorting: <a href="http://sokol8.blogspot.com/2011/04/sorting-nsarray-with-blocks.html" rel="noreferrer">http://sokol8.blogspot.com/2011/04/sorting-nsarray-with-blocks.html</a>

blocks|key|335957|text|您还可以使用类似以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335958|//Sort+the+array+of+items+by++date
++++[self.items+sortUsingComparator:%5ENSComparisonResult(id+obj1,+id+obj2){
++++++++return+[obj2.date+compare:obj1.date];
++++}];|code-block|syntax|javascript|335959|，但这确实假设日期存储为+NString，而不是，这应该不会有任何问题。最好，我还建议以原始格式存储数据。使得在这样的情况下更容易操作。|offset|length|style|BOLD|CODE|335960|entityMap^0|0|0|0|C|D|7|O|18|D|7|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|R|8|@$I|S|J|T|K|L]|$I|U|J|V|K|L]|$I|W|J|X|K|L]|$I|Y|J|Z|K|M]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|O|$]]

You may also use something like the following: 

<pre><code>//Sort the array of items by date
 [self.items sortUsingComparator:^NSComparisonResult(id obj1, id obj2){
 return [obj2.date compare:obj1.date];
 }];
</code></pre>

But this does assume that the date is stored as a <code>NSDate</code> rather a <code>NString</code>, which should be no problem to make/do. Preferably, I recommend also storing the data in it's raw format. Makes it easier to manipulate in situations like this.

blocks|key|335962|text|改变这一点|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335963|NSSortDescriptor+*sortDescriptor+=+[[NSSortDescriptor+alloc]+initWithKey:@"beginDate"+ascending:TRUE];
[myMutableArray+sortUsingDescriptors:[NSArray+arrayWithObject:sortDescriptor]];
[sortDescriptor+release];|code-block|syntax|javascript|335964|至|335965|NSSortDescriptor+*sortDescriptor+=+[[NSSortDescriptor+alloc]+initWithKey:@"Date"+ascending:TRUE];
[myMutableArray+sortUsingDescriptors:[NSArray+arrayWithObject:sortDescriptor]];
[sortDescriptor+release];|335966|只需更改密钥:它必须始终为Date|offset|length|style|CODE|335967|entityMap^0|0|0|0|0|D|4|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Change this 

<pre><code>NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"beginDate" ascending:TRUE];
[myMutableArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
[sortDescriptor release];
</code></pre>

To

<pre><code>NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Date" ascending:TRUE];
[myMutableArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
[sortDescriptor release];
</code></pre>

Just change the KEY: it must be <code>Date</code> always

blocks|key|3314532|text|Swift+3.0|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3314533|myMutableArray+=+myMutableArray.sorted(by:+{+$0.date.compare($1.date)+==+ComparisonResult.orderedAscending+})|code-block|syntax|javascript|3314534|entityMap^0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Swift 3.0

<pre><code>myMutableArray = myMutableArray.sorted(by: { $0.date.compare($1.date) == ComparisonResult.orderedAscending })
</code></pre>

I have an <code>NSArray</code> that contains date strings (i.e. NSString) like this: "Thu, 21 May 09 19:10:09 -0700"

I need to sort the <code>NSArray</code> by date. I thought about converting the date string to an <code>NSDate</code> object first, but got stuck there on how to sort by the <code>NSDate</code> object.

Thanks.

Sort NSArray of date strings or objects

我有一个包含日期字符串(即NSString)的NSArray，如下所示：“strings，21 May 09 19:10:09 -0700”我需要按日期对NSArray进行排序。我考虑过首先将日期字符串转换为NSDate对象，但在如何按NSDate对象排序的问题上遇到了困难。谢谢。

问日期字符串或对象的排序NSArray
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问日期字符串或对象的排序NSArrayEN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问日期字符串或对象的排序NSArray
EN