Question

试图弄清楚如何使用Swift将字符串分成两半。基本上给了一个字符串＆＃34;今天我在莫斯科，明天我将在纽约＆＃34; 这个字符串有13个单词。我想生成2＆＃34;接近长度＆＃34;字符串：＆＃34;今天我在莫斯科，明天＆＃34;和明天我将在纽约＆＃34;

Answer 1

将单词分成数组，然后取两半：

let str = "Today I am in Moscow and tomorrow I will be in New York"
let words = str.componentsSeparatedByString(" ")

let halfLength = words.count / 2
let firstHalf = words[0..<halfLength].joinWithSeparator(" ")
let secondHalf = words[halfLength..<words.count].joinWithSeparator(" ")

print(firstHalf)
print(secondHalf)

根据您的喜好调整halfLength。

Answer 2

如果有人还在寻找简单的方法

在Swift 4及更高版本中：您只需在字符串中间插入chara，然后执行split(separator:


    var str = "Hello, playground"

    let halfLength = str.count / 2

    let index = str.index(str.startIndex, offsetBy: halfLength)
    str.insert("-", at: index)
    let result = str.split(separator: "-")

有关String.Index的更多信息：Find it here

Answer 3

Swift 5.0

我已经在一个有用的扩展程序中转换了很好的Code Different答案：

extension String {
   func splitStringInHalf()->(firstHalf:String,secondHalf:String) {
        let words = self.components(separatedBy: " ")
        let halfLength = words.count / 2
        let firstHalf = words[0..<halfLength].joined(separator: " ")
        let secondHalf = words[halfLength..<words.count].joined(separator: " ")
        return (firstHalf:firstHalf,secondHalf:secondHalf)
    }
}

用法：

let str = "Today I am in Moscow and tomorrow I will be in New York".splitStringInHalf()
print(str.firstHalf)
print(str.secondHalf)

使用Swift将字符串拆分为一半（Word-Aware）

3 个答案:

Swift 5.0