split 现在抱怨缺少“isSeparator"；

问题描述

Swift 1.2 最新升级后，我不知道如何将一行文本拆分为单词.我曾经这样做过:

After the latest upgrade of Swift 1.2, I can't figure out how to split a line of text into words. I used to do this:

let bits = split(value!, { $0 == " "}, maxSplit: Int.max, allowEmptySlices: false)

但这不再有效，因为...

But that no longer works, because...

Cannot invoke 'split' with an argument list of type '(String, (_) -> _, maxSplit: Int, allowEmptySlices: Bool)'

嗯，好吧，即使我可以最后建造?好吧，无论如何，让我们尝试...

Ummm, ok, even though I could last build? Well whatever, let's try...

let bits = split(value!, { $0 == " "})

好吧，我能想到的所有其他版本最终都会说:

Well that and every other version I can think of ends up saying:

Missing argument for parameter 'isSeparator' in call

让我们听听新编程语言的 Beta 测试！耶！

Let's hear it for beta-testing new programming languages! Yay!

有人知道 1.2 的正确秘诀吗?

Anyone know the correct secret sauce for 1.2?

推荐答案

Swift 1.2 中的参数顺序似乎发生了变化:

It seems that the order of the parameters changed in Swift 1.2:

let bits = split(value!, maxSplit: Int.max, allowEmptySlices: false,
                 isSeparator: { $0 == " "})

或者，使用默认值:

let bits = split(value!, isSeparator: { $0 == " "})

谓词现在是最后一个参数，需要一个外部参数名称 isSeparator 因为它前面是可选参数.

The predicate is now the last parameter and requires an externalparameter name isSeparator because it is preceded by optional parameters.

这个改动的好处是可以使用尾随闭包语法:

The advantage of this change is that you can use the trailing closuresyntax:

let bits = split(value!, maxSplit: Int.max, allowEmptySlices: false) { $0 == " " }

或

let bits = split(value!) { $0 == " " }

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