Swift字串可變性

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1 您可以通過將一個特定字串分配給一個變數來對其進行修改,或者分配給一個常量來保證其不會被修改:2 var variableString = "Horse"3 variableString += " and carriage"  // variableString 現在為 "Horse and carriage"4 let constantString = "Highlander"5 constantString += " and another Highlander" // 這會報告一個編譯錯誤(compile-time error) - 常量不可以被修改。 6 注意:在 Objective-C 和 Cocoa 中,您通過選擇兩個不同的類( NSString 和 NSMutableString )來指定該字串是否可以被修改,Swift中的字串是否可以修改僅通過定義的是變數還是常量來決定,實現了多種類型可變性操作的統一。

 

Swift字串可變性

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