func subString(fromIndex index: Int, endIndex: Int) -> String {
let start = self.index(self.startIndex, offsetBy: index)
let end = self.index(self.startIndex, offsetBy: endIndex)
return String(self[start...end])
}
func subString(fromIndex index: Int, endIndex: Int) -> String {
let start = self.index(self.startIndex, offsetBy: index)
let end = self.index(self.startIndex, offsetBy: endIndex)
return String(self[start...end])
}
本文标题：Swift 字符串截取方法 --- 分类中实现
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