ios 如何将 NSMutableArray 中的字符串按字母顺序排序？

How can I sort strings in NSMutableArray into alphabetical order?

提问by praveena

I have a list of strings in an NSMutableArray, and I want to sort them into alphabetical order before displaying them in my table view.

我在 中有一个字符串列表NSMutableArray，我想在将它们显示在我的表视图中之前按字母顺序对它们进行排序。

How can I do that?

我怎样才能做到这一点？

回答by Vijay-Apple-Dev.blogspot.com

There is the following Apple's working example, using sortedArrayUsingSelector:and localizedCaseInsensitiveCompare:in the Collections Documentation:

有以下 Apple 的工作示例，在Collections Documentation 中使用sortedArrayUsingSelector:和：localizedCaseInsensitiveCompare:

sortedArray = [anArray sortedArrayUsingSelector:
                       @selector(localizedCaseInsensitiveCompare:)];

Note that this will return a new sorted array. If you want to sort your NSMutableArrayin place, then use sortUsingSelector:instead, like so:

请注意，这将返回一个新的排序数组。如果您想NSMutableArray就地排序，请sortUsingSelector:改用，如下所示：

[mutableArray sortUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

回答by aksh1t

Here's an updated answer for Swift:

这是Swift的更新答案：

• Sorting can be done in Swift with the help of closures. There are two methods - sortand sortedwhich facilitate this.

  var unsortedArray = [ "H", "ello", "Wo", "rl", "d"]
  var sortedArray = unsortedArray.sorted { 
  unsortedArray.sort { 
  var unsortedArray = [ "H", "ello", "Wo", "rl", "d"]
  var sortedArray = unsortedArray.sorted { 
  unsortedArray.sort { 
  stringArray.sort{ 
  stringArray.sort{ 
  NSSortDescriptor *sortDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
  sortedArray=[yourArray sortedArrayUsingDescriptors:@[sortDesc]];
   <  }
  .lowercaseString < .lowercaseString }
  .localizedCaseInsensitiveCompare() == NSComparisonResult.OrderedAscending }
  .localizedCaseInsensitiveCompare() == NSComparisonResult.OrderedAscending }
  .localizedCaseInsensitiveCompare() == NSComparisonResult.OrderedAscending }
  .localizedCaseInsensitiveCompare() == NSComparisonResult.OrderedAscending }
  

  Note: Here sortedwill return a sorted array. The unsortedArrayitself will not be sorted.

• If you want to sort unsortedArrayitself, use this

  NSSortDescriptor * sortDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES selector:@selector(caseInsensitiveCompare:)]; 
  sortedArray=[yourArray sortedArrayUsingDescriptors:@[sortDesc]];
  

• 排序可以在 Swift 中借助闭包来完成。有两种方法-sort并sorted有利于这一点。

  areas = [areas sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
  

  注意：这里sorted将返回一个已排序的数组。该unsortedArray本身不会进行排序。

• 如果你想自己排序unsortedArray，使用这个

  ##代码##

---

---

Reference :参考 ：

• Hereis the documentation for Swift's sorting methods.

• Docs for different Stringcomparison methods here.

• 这是 Swift 排序方法的文档。

• 此处为不同String比较方法的文档。

---

---

Optional:

可选：

Instead of using localizedCaseInsensitiveCompare, this could also be done:

除了使用localizedCaseInsensitiveCompare，还可以这样做：

##代码##

or even

甚至

##代码##

if you want a case sensitive comparison

如果您想要区分大小写的比较

回答by Kupendiran iOS

It's easy to get the ascending order. Follow the bellow steps,,,

很容易得到升序。按照以下步骤，，，

Model 1 :

模型 1：

##代码##

If you want the sorting to be case insensitive, you would need to set the descriptor like this,,
Model 2 :

如果您希望排序不区分大小写，则需要像这样设置描述符，
模型 2：

##代码##

回答by Narasimha Nallamsetty

For me this worked....

对我来说这有效....

##代码##

Here areas is NSArray. I hope it helps someone.

这里的区域是NSArray。我希望它可以帮助某人。