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

在解释Don Vaughn的答案时，我喜欢使用正则表达式。我很惊讶这只是Regex的第二个答案。然而，如果我们能用一个拆分方法而不是多个方法来解决这个问题，那就太好了。

我也受到了米特拉·辛加姆（Mithra Singam）的《答案》（Answer）的启发，排除了所有标点符号和空格。然而，不得不创建一个不允许的角色列表并没有引起我的共鸣。

\w-字母或数字符号的正则表达式。没有标点符号。

let foo = "(..#   Hello,,(---- World   ".split {
    String($0).range(of: #"\w"#, options: .regularExpression) == nil
}
print(foo) // Prints "Hello World"

让我们假设你对Unicode不太满意。ASKII字母和数字怎么样？

let bar = "(..#   Hello,,(---- World   ".split {
    !($0.isASCII && ($0.isLetter || $0.isNumber))
}
print(bar) // Prints "Hello World"

我发现了一个有趣的案例

方法1

var data:[String] = split( featureData ) { $0 == "\u{003B}" }

当我使用此命令从从服务器加载的数据中拆分一些符号时，它可以在模拟器中测试时拆分，并与测试设备同步，但不会在发布应用程序和Ad Hoc中拆分

我花了很多时间来跟踪这个错误，它可能会被某些Swift版本或iOS版本诅咒，或者两者都没有

这也与HTML代码无关，因为我尝试stringByRemovangPercentEncoding，但它仍然不起作用

2015年10月10日新增

在Swift 2.0中，此方法已更改为

var data:[String] = featureData.split {$0 == "\u{003B}"}

方法2

var data:[String] = featureData.componentsSeparatedByString("\u{003B}")

当我使用此命令时，它可以正确分割从服务器加载的相同数据

结论，我真的建议使用方法2

string.componentsSeparatedByString("")

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 == " "}

苹果发行说明

在Swift 4.2和Xcode 10中

//This is your str
let str = "This is my String" //Here replace with your string

选项1

let items = str.components(separatedBy: " ")//Here replase space with your value and the result is Array.
//Direct single line of code
//let items = "This is my String".components(separatedBy: " ")
let str1 = items[0]
let str2 = items[1]
let str3 = items[2]
let str4 = items[3]
//OutPut
print(items.count)
print(str1)
print(str2)
print(str3)
print(str4)
print(items.first!)
print(items.last!)

选项2

let items = str.split(separator: " ")
let str1 = String(items.first!)
let str2 = String(items.last!)
//Output
print(items.count)
print(items)
print(str1)
print(str2)

选项3

let arr = str.split {$0 == " "}
print(arr)

选项4

let line = "BLANCHE:   I don't want realism. I want magic!"
print(line.split(separator: " "))
// Prints "["BLANCHE:", "I", "don\'t", "want", "realism.", "I", "want", "magic!"]"

通过Apple文档。。。。

let line = "BLANCHE:   I don't want realism. I want magic!"
print(line.split(separator: " "))
// Prints "["BLANCHE:", "I", "don\'t", "want", "realism.", "I", "want", "magic!"]"

print(line.split(separator: " ", maxSplits: 1))//This can split your string into 2 parts
// Prints "["BLANCHE:", "  I don\'t want realism. I want magic!"]"

print(line.split(separator: " ", maxSplits: 2))//This can split your string into 3 parts

print(line.split(separator: " ", omittingEmptySubsequences: false))//array contains empty strings where spaces were repeated.
// Prints "["BLANCHE:", "", "", "I", "don\'t", "want", "realism.", "I", "want", "magic!"]"

print(line.split(separator: " ", omittingEmptySubsequences: true))//array not contains empty strings where spaces were repeated.
print(line.split(separator: " ", maxSplits: 4, omittingEmptySubsequences: false))
print(line.split(separator: " ", maxSplits: 3, omittingEmptySubsequences: true))

雨燕3

let line = "AAA    BBB\t CCC"
let fields = line.components(separatedBy: .whitespaces).filter {!$0.isEmpty}

返回三个字符串AAA、BBB和CCC筛选出空字段处理多个空格和制表字符如果要处理新行，请将.whittespaces替换为.whittespace和新行