在 iOS8 及之前我可以使用:

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

在 iOS9 中 stringByAddingPercentEscapesUsingEncoding 已被替换为 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？

最佳答案

弃用消息说(强调我的):

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，有一个非常方便的类方法，称为 URLHostAllowedCharacterSet，您可以像这样使用它:

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

Swift 3 的更新——该方法变为静态属性 urlHostAllowed:

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

但请注意:

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

关于ios - 在 ios9 中替换 stringByAddingPercentEscapesUsingEncoding？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32242712/