在 Swift 中使用 Set 时出现编译器分段错误

问题描述

此代码工作正常:

let lines = ["one", "one", "two"]
let lineSet = lines

但是在编译这个时:

let lines = ["one", "one", "two"]
let lineSet = Set(lines)

我得到:

由于信号导致命令失败:分段错误:11

我有 Xcode 版本 9.0 (9A235).这真的是一个错误还是我做错了什么?

I've got Xcode Version 9.0 (9A235). Is this is really a bug or am I just doing something wrong?

我现在的解决方法:

var lineSet = Set<String>()
let lines = ["one", "one", "two"]
lines.forEach { lineSet.insert($0) }

推荐答案

构建 lineSet 的更好、更惯用的方法很简单:

A better, more idiomatic way to construct your lineSet is simply:

let lineSet: Set = ["one", "one", "two"]

希望这能修复您的编译器崩溃.不幸的是，我无法完全重现您的原始问题，因此我无法确定我的修复是否会有所不同 ;)

Hope this fixes your compiler crash. Unfortunately, I was unable to fully reproduce your original issue, so I can't really confirm my fix will be any different ;)

如前所述，删除您的 DerivedData 文件夹是个好主意(~/Library/Caches/com.apple.dt.Xcode 也可能有所帮助).当 Xcode 开始出现异常行为时，这是一种有点标准的做法.

As already mentioned, deleting your DerivedData folder is a good idea (also ~/Library/Caches/com.apple.dt.Xcode might help as well). A somewhat standard practice when Xcode starts behaving erratically.

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