按键排序字典 [英] Sort Dictionary by keys

问题描述

我想在Swift中排序一个字典。我有一个字典，如：

 A=> Array [] 
Z=> Array [] 
D=> Array [] 
  

等。我想要它像

 A=> Array [] 
D=> Array [] 
Z=>数组[] 
  

等。

在SO上尝试了许多解决方案，但没有人为我工作。我正在使用XCode6 Beta 5，其中一些是给编译器错误，一些解决方案提供了例外。所以任何人都可以发布字典排序的工作副本。

解决方案

  let dictionary = 
A：[1，2]，
Z：[3，4]，
D：[5，6] 
] 
 
 let sortedKeys = Array（dictionary.keys）.sorted（<）// [A，D，Z] 
  

编辑：

上述代码中排序的数组只包含键值，而值必须从原始字典检索。然而，'Dictionary'也是（key，value）对的'CollectionType'，我们可以使用全局'sorted'函数来获取包含键和值的排序数组，如下所示：

 code> let sortedKeysAndValues = sorted（dictionary）{$ 0.0 < $ 1.0 
 println（sortedKeysAndValues）// [（A，[1，2]），（D，[5,6]），（Z，[3，4]）] 
  

EDIT2：每月更改的Swift语法目前喜欢

  let sortedKeys = Array（dictionary.keys）.sort（<）// [A，D，Z] 
  

全部已排序已被弃用。

I want to sort a dictionary in Swift. I have a dictionary like:

"A" => Array[]
"Z" => Array[]
"D" => Array[]

etc. I want it to be like

"A" => Array[]
"D" => Array[]
"Z" => Array[]

etc.

I have tried many solutions on SO but no one worked for me. I am using XCode6 Beta 5 and on it some are giving compiler error and some solutions are giving exceptions. So anyone who can post the working copy of dictionary sorting.

解决方案

let dictionary = [
    "A" : [1, 2],
    "Z" : [3, 4],
    "D" : [5, 6]
]

let sortedKeys = Array(dictionary.keys).sorted(<) // ["A", "D", "Z"]

EDIT:

The sorted array from the above code contains keys only, while values have to be retrieved from the original dictionary. However, 'Dictionary' is also a 'CollectionType' of (key, value) pairs and we can use the global 'sorted' function to get a sorted array containg both keys and values, like this:

let sortedKeysAndValues = sorted(dictionary) { $0.0 < $1.0 }
println(sortedKeysAndValues) // [(A, [1, 2]), (D, [5, 6]), (Z, [3, 4])]

EDIT2: The monthly changing Swift syntax currently prefers

let sortedKeys = Array(dictionary.keys).sort(<) // ["A", "D", "Z"]

The global sorted is deprecated.

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