在Swift中将字元串拆分成數組？

本文翻譯自：Split a String into an array in Swift?

Say I have a string here:

說我在這裡有一個字元串：

var fullName: String = "First Last"

I want to split the string base on white space and assign the values to their respective variables

我想在空白處分割字元串并将值配置設定給它們各自的變量

var fullNameArr = // something like: fullName.explode(" ") 

var firstName: String = fullNameArr[0]
var lastName: String? = fullnameArr[1]

Also, sometimes users might not have a last name.

同樣，有時使用者可能沒有姓氏。

#1樓

參考：https://stackoom.com/question/1jk7J/在Swift中将字元串拆分成數組

#2樓

The easiest method to do this is by using componentsSeparatedBy:

最簡單的方法是使用componentsSeparatedBy：

For Swift 2:

對于Swift 2：

import Foundation
let fullName : String = "First Last";
let fullNameArr : [String] = fullName.componentsSeparatedByString(" ")

// And then to access the individual words:

var firstName : String = fullNameArr[0]
var lastName : String = fullNameArr[1]

For Swift 3:

對于Swift 3：

import Foundation

let fullName : String = "First Last"
let fullNameArr : [String] = fullName.components(separatedBy: " ")

// And then to access the individual words:

var firstName : String = fullNameArr[0]
var lastName : String = fullNameArr[1]

#3樓

Just call

componentsSeparatedByString

method on your

fullName

隻需在您的 fullName 上調用 componentsSeparatedByString 方法

import Foundation

var fullName: String = "First Last"
let fullNameArr = fullName.componentsSeparatedByString(" ")

var firstName: String = fullNameArr[0]
var lastName: String = fullNameArr[1]

Update for Swift 3+

Swift 3+更新

import Foundation

let fullName    = "First Last"
let fullNameArr = fullName.components(separatedBy: " ")

let name    = fullNameArr[0]
let surname = fullNameArr[1]

#4樓

As an alternative to WMios's answer, you can also use

componentsSeparatedByCharactersInSet

, which can be handy in the case you have more separators (blank space, comma, etc.).

作為WMios答案的替代方法，您還可以使用 componentsSeparatedByCharactersInSet ，如果您有更多的分隔符（空格，逗号等），則可以使用該 componentsSeparatedByCharactersInSet 。

With your specific input:

用您的特定輸入：

let separators = NSCharacterSet(charactersInString: " ")
var fullName: String = "First Last";
var words = fullName.componentsSeparatedByCharactersInSet(separators)

// words contains ["First", "Last"]

Using multiple separators:

使用多個分隔符：

let separators = NSCharacterSet(charactersInString: " ,")
var fullName: String = "Last, First Middle";
var words = fullName.componentsSeparatedByCharactersInSet(separators)

// words contains ["Last", "First", "Middle"]

#5樓

The Swift way is to use the global

split

function, like so:

Swift的方法是使用全局 split 功能，如下所示：

var fullName = "First Last"
var fullNameArr = split(fullName) {$0 == " "}
var firstName: String = fullNameArr[0]
var lastName: String? = fullNameArr.count > 1 ? fullNameArr[1] : nil

with Swift 2

與Swift 2

In Swift 2 the use of split becomes a bit more complicated due to the introduction of the internal CharacterView type.

在Swift 2中，由于引入了内部CharacterView類型，對split的使用變得更加複雜。

This means that String no longer adopts the SequenceType or CollectionType protocols and you must instead use the

.characters

property to access a CharacterView type representation of a String instance.

這意味着String不再采用SequenceType或CollectionType協定，而必須使用 .characters 屬性通路String執行個體的CharacterView類型表示。

(Note: CharacterView does adopt SequenceType and CollectionType protocols).

（注意：CharacterView确實采用SequenceType和CollectionType協定）。

let fullName = "First Last"
let fullNameArr = fullName.characters.split{$0 == " "}.map(String.init)
// or simply:
// let fullNameArr = fullName.characters.split{" "}.map(String.init)

fullNameArr[0] // First
fullNameArr[1] // Last

#6樓

Swift 4 or later

Swift 4或更高版本

If you just need to properly format a person name, you can use PersonNameComponentsFormatter .