stringByReplacingCharactersInRange 不起作用? [英] stringByReplacingCharactersInRange does not work?

问题描述

我正在尝试用另一个字符替换一个字符.出于某种原因，stringByReplacingCharactersInRange 不起作用.我还没有找到有关如何解决此问题的简单说明.

I am attempting to replace a character with another one. For some reason stringByReplacingCharactersInRange does not work. I have not found a simple explanation on how to resolve this issue.

var binaryColor: String = "000"
(binaryColor as NSString).stringByReplacingCharactersInRange(NSMakeRange(0, 1), withString: "1")
println("This is binaryColor0: \(binaryColor)")

结果是 000 而不是 100.感谢您的帮助！

The result is 000 and not 100. Thanks for any help!

推荐答案

您无需将其强制转换为 NSString 即可使用 stringByReplacingCharactersInRange，您只需更改创建字符串范围的方式，如下所示:

You don't need to cast it to NSString to use stringByReplacingCharactersInRange you just need to change the way you create your string range as follow:

更新:Xcode 7.2 • Swift 2.1.1

let binaryColor = "000"
let resultString = binaryColor.stringByReplacingCharactersInRange(
    Range(start: binaryColor.startIndex, end: binaryColor.startIndex.advancedBy(1)),
    withString: "1")

或者干脆

let resultString2 = binaryColor.stringByReplacingCharactersInRange(
    binaryColor.startIndex..<binaryColor.startIndex.advancedBy(1),
    withString: "1")

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