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 Dev.4.0（2017年5月24日）
Swift 4（Beta版）中拆分了一个新功能。
import Foundation
let sayHello = "Hello Swift 4 2017";
let result = sayHello.split(separator: " ")
print(result)
输出：
["Hello", "Swift", "4", "2017"]
访问值：
print(result[0]) // Hello
print(result[1]) // Swift
print(result[2]) // 4
print(result[3]) // 2017
Xcode 8.1/Swift 3.0.1
这是多个分隔符与数组的方式。
import Foundation
let mathString: String = "12-37*2/5"
let numbers = mathString.components(separatedBy: ["-", "*", "/"])
print(numbers)
输出：
["12", "37", "2", "5"]
其他回答
对于swift 2，XCode 7.1：
let complete_string:String = "Hello world"
let string_arr = complete_string.characters.split {$0 == " "}.map(String.init)
let hello:String = string_arr[0]
let world:String = string_arr[1]
我还没有找到能够处理3个或更多组件名称并支持较旧iOS版本的解决方案。
struct NameComponentsSplitter {
static func split(fullName: String) -> (String?, String?) {
guard !fullName.isEmpty else {
return (nil, nil)
}
let components = fullName.components(separatedBy: .whitespacesAndNewlines)
let lastName = components.last
let firstName = components.dropLast().joined(separator: " ")
return (firstName.isEmpty ? nil : firstName, lastName)
}
}
通过测试用例：
func testThatItHandlesTwoComponents() {
let (firstName, lastName) = NameComponentsSplitter.split(fullName: "John Smith")
XCTAssertEqual(firstName, "John")
XCTAssertEqual(lastName, "Smith")
}
func testThatItHandlesMoreThanTwoComponents() {
var (firstName, lastName) = NameComponentsSplitter.split(fullName: "John Clark Smith")
XCTAssertEqual(firstName, "John Clark")
XCTAssertEqual(lastName, "Smith")
(firstName, lastName) = NameComponentsSplitter.split(fullName: "John Clark Jr. Smith")
XCTAssertEqual(firstName, "John Clark Jr.")
XCTAssertEqual(lastName, "Smith")
}
func testThatItHandlesEmptyInput() {
let (firstName, lastName) = NameComponentsSplitter.split(fullName: "")
XCTAssertEqual(firstName, nil)
XCTAssertEqual(lastName, nil)
}
将字符串拆分为数组的简单方法
var fullName:String=“First Last”；var fullNameArr=fullName.componentsSeparatedByString（“”）var firstName:String=fullNameArr[0]var lastName:String=fullNameArr[1]
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]
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。：）
