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
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。
其他回答
Swift 4使拆分字符变得更加容易，只需为字符串使用新的拆分函数即可。
例子：让s=“嗨，你好”让a=s.split（分隔符：“，”）打印（a）
现在您得到了一个带有“hi”和“hello”的数组。
根据Swift 2.2
您只需编写2行代码，就会得到拆分字符串。
let fullName = "FirstName LastName"
var splitedFullName = fullName.componentsSeparatedByString(" ")
print(splitedFullName[0])
print(splitedFullName[1])
享受。：）
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))
我在寻找loosy拆分，例如PHP的分解，其中空序列包含在结果数组中，这对我很有用：
"First ".split(separator: " ", maxSplits: 1, omittingEmptySubsequences: false)
输出：
["First", ""]
斯威夫特2.2添加了错误处理和大写字符串：
func setFullName(fullName: String) {
var fullNameComponents = fullName.componentsSeparatedByString(" ")
self.fname = fullNameComponents.count > 0 ? fullNameComponents[0]: ""
self.sname = fullNameComponents.count > 1 ? fullNameComponents[1]: ""
self.fname = self.fname!.capitalizedString
self.sname = self.sname!.capitalizedString
}
