swift如何拆分字符串但包含分隔符

如果不知道字符串是否包含空格,则可能应该使用 Scanner

let string = "100 + 8 - 9 + 10"

let removed = string.replacingOccurrences(of: " ", with: "")
// "100+8-9+10"

let scanner = Scanner(string: removed)

let operators = CharacterSet(charactersIn: "+-*/")

var components: [String] = []

while !scanner.isAtEnd {
    var value: Int = 0
    if scanner.scanInt(&value) {
        components.append("\(value)")
    }

    var op: NSString? = ""
    if scanner.scanCharacters(from: operators, into: &op) {
        components.append(op! as String)
    }
}

print(components)

// ["100", "+", "8", "-", "9", "+", "10"]

你可以用空格分开你的字符串。

let splitted = string.split(separator: " ")

价值 splitted 是

["100", "+", "8", "-", "9", "+", "10"]