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
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", ""]
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。
Swift 5.2的更新和最简单的方式
let paragraph = "Bob hit a ball, the hit BALL flew far after it was hit. Hello! Hie, How r u?"
let words = paragraph.components(separatedBy: [",", " ", "!",".","?"])
这张照片，
[“Bob”，“hit”，“a”，“ball”，“the”，“击球”，“ball”，“fly”，“far”，“after”，“it”，“was”，“hit”，“Hello”，“Hie”，“How”，“u”，“”]
但是，如果要过滤空字符串，
let words = paragraph.components(separatedBy: [",", " ", "!",".","?"]).filter({!$0.isEmpty})
输出
[“Bob”，“hit”，“a”，“ball”，“the”，“命中”，“ball”，“fly”，“far”，“after”，“it”，“was”，“hit”，“Hello”，”Hie“，”How“，”r“，”u“]
但请确保，Foundation已导入。
这里是我刚刚构建的一个算法，它将通过数组中的任何字符分割字符串，如果有任何希望保留具有分割字符的子字符串，可以将swall参数设置为true。
Xcode 7.3-Swift 2.2：
extension String {
func splitBy(characters: [Character], swallow: Bool = false) -> [String] {
var substring = ""
var array = [String]()
var index = 0
for character in self.characters {
if let lastCharacter = substring.characters.last {
// swallow same characters
if lastCharacter == character {
substring.append(character)
} else {
var shouldSplit = false
// check if we need to split already
for splitCharacter in characters {
// slit if the last character is from split characters or the current one
if character == splitCharacter || lastCharacter == splitCharacter {
shouldSplit = true
break
}
}
if shouldSplit {
array.append(substring)
substring = String(character)
} else /* swallow characters that do not equal any of the split characters */ {
substring.append(character)
}
}
} else /* should be the first iteration */ {
substring.append(character)
}
index += 1
// add last substring to the array
if index == self.characters.count {
array.append(substring)
}
}
return array.filter {
if swallow {
return true
} else {
for splitCharacter in characters {
if $0.characters.contains(splitCharacter) {
return false
}
}
return true
}
}
}
}
例子：
"test text".splitBy([" "]) // ["test", "text"]
"test++text--".splitBy(["+", "-"], swallow: true) // ["test", "++" "text", "--"]
只有拆分才是正确的答案，这里有两个以上空格的差异。
雨燕5
var temp = "Hello world ni hao"
let arr = temp.components(separatedBy: .whitespacesAndNewlines)
// ["Hello", "world", "", "", "", "", "ni", "hao"]
let arr2 = temp.components(separatedBy: " ")
// ["Hello", "world", "", "", "", "", "ni", "hao"]
let arr3 = temp.split(whereSeparator: {$0 == " "})
// ["Hello", "world", "ni", "hao"]
斯威夫特4
let words = "these words will be elements in an array".components(separatedBy: " ")
