字符串截取演练 - ShenYj/ShenYj.github.io GitHub Wiki

字符串截取演练

原始字符串

Swift 5.1 斯威夫特

想要结果 截取前部)

Swift 5
  • 方式一
let str: String = "Swift 5.1 斯威夫特"
let startIdx = str.startIndex

let index = str.index(startIdx, offsetBy: 7)
let subStr: String = String(str.prefix(upTo: index))
  • 方式二
let str: String = "Swift 5.1 斯威夫特"
let startIdx = str.startIndex

let subStr: String = String(str.prefix(7))

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