在ios9中替换stringByAddingPercentEscapesUsingEncoding？

问题描述：

在iOS8之前，我可以使用：

In iOS8 and prior I can use:

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

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：在哪里找到需要的 NSCharacterSet （ NSUTF8StringEncoding ）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):

使用stringByAddingPercentEncodingWithAllowedCharacters ，始终使用推荐的UTF-8编码，并且编码特定的URL组件或子组件，因为每个URL组件或子组件对于哪些字符有效，具有不同的规则。

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，有一个非常方便的类方法叫做 URLHostAllowedCharacterSet ，你可以这样使用：

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())

em> 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)

，那就是：

此方法用于对URL组件或子组件字符串进行百分比编码，而不是整个URL字符串。

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

在ios9中替换stringByAddingPercentEscapesUsingEncoding？

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