Swift String split()

var text = "Swift is a fun programming language"

// split the text from space
print(text.split(separator: " "))

// Output: ["Swift", "is", "a", "fun", "programming", "language"]

split() 语法

split() 的语法是

string.split(separator: Character, maxSplits: Int, ommittingEmptySequence: Bool)

此处，string 是 String 类的一个对象。

split() 参数

split() 方法可以接受三个参数

• separator - 发生拆分的定界符。
• maxSplits (可选) - 最大拆分次数。如果未提供，则拆分次数没有限制。
• omittingEmptySubsequences (可选) - 指定是省略空字符串元素还是包含它们

split() 返回值

• 返回一个子字符串数组

示例 1：Swift split()

var text = "Swift is awesome. Swift is fun."

// split at period "."
print(text.split(separator: "."))

// split string with limit
print(text.split(separator: " ", maxSplits: 2))

输出

["Swift is awesome", " Swift is fun"]
["Swift", "is", "awesome. Swift is fun."]

示例 2：带有 omittingEmptySubsequences 参数的 split()

var text = "Swift  is a fun programming language"

// split the text from space
// returned array doesn't contain empty string
print(text.split(separator: " ", maxSplits: 2, omittingEmptySubsequences: true))

// returned array contains empty string
print(text.split(separator: " ", maxSplits: 2, omittingEmptySubsequences: false))

输出

["Swift", "is", "a fun programming language"]
["Swift", "", "is a fun programming language"]