这直接提供了一个分割部分的数组

var fullNameArr = fullName.components(separatedBy:" ")

那么你可以这样使用，

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

作为WMios答案的替代方案，您还可以使用componentsSeparatedByCharactersSet，这在分隔符（空格、逗号等）较多的情况下非常方便。

使用您的特定输入：

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

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

使用多个分隔符：

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

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

这是用于swift 4.2在20181206 1610的字符串和CSV文件

var dataArray : [[String]] = []
 let path = Bundle.main.path(forResource: "csvfilename", ofType: "csv")
        let url = URL(fileURLWithPath: path!)
        do {
            let data = try Data(contentsOf: url) 
            let content = String(data: data, encoding: .utf8)
            let parsedCSV = content?.components(separatedBy: "\r\n").map{ $0.components(separatedBy: ";") }
           for line in parsedCSV!
            {
                dataArray.append(line)
           }
        }
        catch let jsonErr {
            print("\n   Error read CSV file: \n ", jsonErr)
        }

            print("\n MohNada 20181206 1610 - The final result is \(dataArray)  \n ")

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。：）

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

var fullName = "James Keagan Michael"
let first = fullName.components(separatedBy: " ").first?.isEmpty == false ? fullName.components(separatedBy: " ").first! : "John"
let last =  fullName.components(separatedBy: " ").last?.isEmpty == false && fullName.components(separatedBy: " ").last != fullName.components(separatedBy: " ").first ? fullName.components(separatedBy: " ").last! : "Doe"

不允许使用相同的名字和姓氏如果全名无效，则取占位符值“John Doe”