Question

在swift中获取String的前5个字符最简洁的方法是什么？谢谢。

Answer 1

前5个字符

let str = "SampleText"
let result = String(str.characters.prefix(5)) // result = "Sampl"

SWIFT 4

let str = "SampleText"
let result = String(str.prefix(5)) // result = "Sampl"

Answer 2

获取最多5个字符的索引，然后使用子字符串

let str = "Hello World!"
if str.utf16.count >= 5{
    let a = str.index(str.startIndex, offsetBy: 5)
    let result = str.substring(to: a)
}else{
    //lenght in shorter
}

Answer 3

在Swift 4中，它进行了更改：

let text         = "sampleText"

let resultPrefix = text.prefix(5)  //result = "sampl"
let resultSuffix = text.suffix(6) // result = "eText"

如何在swift中简洁地获取字符串的前5个字符？

3 个答案: