替换 ios9 中的 stringByAddingPercentEscapesUsingEncoding?

问题描述：

在 iOS8 及更早版本中我可以使用:

In iOS8 and prior I can use:

NSString *str = ...; // some URL
NSString *result = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

在 iOS9 中 stringByAddingPercentEscapesUsingEncoding 已被替换为 stringByAddingPercentEncodingWithAllowedCharacters:

in iOS9 stringByAddingPercentEscapesUsingEncoding has been replaced with stringByAddingPercentEncodingWithAllowedCharacters:

NSString *str = ...; // some URL
NSCharacterSet *set = ???; // where to find set for NSUTF8StringEncoding?
NSString *result = [str stringByAddingPercentEncodingWithAllowedCharacters:set];

我的问题是:在哪里可以找到所需的 NSCharacterSet (NSUTF8StringEncoding) 以正确替换 stringByAddingPercentEscapesUsingEncoding?

and my question is: where to find needed NSCharacterSet (NSUTF8StringEncoding) for proper replacement of stringByAddingPercentEscapesUsingEncoding?

答

弃用消息说(强调我的):

The deprecation message says (emphasis mine):

改用 stringByAddingPercentEncodingWithAllowedCharacters(_:)，它总是使用推荐的 UTF-8 编码，并且它为特定的 URL 组件或子组件编码，因为每个 URL 组件或子组件对哪些字符有不同的规则是有效的.

Use stringByAddingPercentEncodingWithAllowedCharacters(_:) instead, which always uses the recommended UTF-8 encoding, and which encodes for a specific URL component or subcomponent since each URL component or subcomponent has different rules for what characters are valid.

所以你只需要提供一个足够的 NSCharacterSet 作为参数.幸运的是，对于 URL，有一个名为 URLHostAllowedCharacterSet 的非常方便的类方法，您可以像这样使用:

So you only need to supply an adequate NSCharacterSet as argument. Luckily, for URLs there's a very handy class method called URLHostAllowedCharacterSet that you can use like this:

let encodedHost = unencodedHost.stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet())

更新 Swift 3 -- 该方法成为静态属性 urlHostAllowed:

Update for Swift 3 -- the method becomes the static property urlHostAllowed:

let encodedHost = unencodedHost.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)

但是请注意:

此方法旨在对 URL 组件或子组件字符串进行百分比编码，而不是对整个 URL 字符串进行百分比编码.

This method is intended to percent-encode an URL component or subcomponent string, NOT an entire URL string.

替换 ios9 中的 stringByAddingPercentEscapesUsingEncoding?

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