假设我这里有一个字符串：
var fullName: String = "First Last"
我想在空白处拆分字符串，并将值分配给它们各自的变量
var fullNameArr = // something like: fullName.explode(" ")
var firstName: String = fullNameArr[0]
var lastName: String? = fullnameArr[1]
此外，有时用户可能没有姓氏。
当前回答
Xcode 8.0/Swift 3
let fullName = "First Last"
var fullNameArr = fullName.components(separatedBy: " ")
var firstname = fullNameArr[0] // First
var lastname = fullNameArr[1] // Last
漫长的道路：
var fullName: String = "First Last"
fullName += " " // this will help to see the last word
var newElement = "" //Empty String
var fullNameArr = [String]() //Empty Array
for Character in fullName.characters {
if Character == " " {
fullNameArr.append(newElement)
newElement = ""
} else {
newElement += "\(Character)"
}
}
var firsName = fullNameArr[0] // First
var lastName = fullNameArr[1] // Last
其他回答
只有拆分才是正确的答案，这里有两个以上空格的差异。
雨燕5
var temp = "Hello world ni hao"
let arr = temp.components(separatedBy: .whitespacesAndNewlines)
// ["Hello", "world", "", "", "", "", "ni", "hao"]
let arr2 = temp.components(separatedBy: " ")
// ["Hello", "world", "", "", "", "", "ni", "hao"]
let arr3 = temp.split(whereSeparator: {$0 == " "})
// ["Hello", "world", "ni", "hao"]
Swift 4、Xcode 10和iOS 12更新100%工作
let fullName = "First Last"
let fullNameArr = fullName.components(separatedBy: " ")
let firstName = fullNameArr[0] //First
let lastName = fullNameArr[1] //Last
有关更多信息，请参阅此处的Apple文档。
最简单的方法是使用组件SeparatedBy:
对于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]
对于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]
斯威夫特4
let words = "these words will be elements in an array".components(separatedBy: " ")
这在Beta 5中再次发生了变化。哭泣！它现在是CollectionType上的一个方法
旧版本：
var fullName = "First Last"
var fullNameArr = split(fullName) {$0 == " "}
新建：
var fullName = "First Last"
var fullNameArr = fullName.split {$0 == " "}
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