将字符串转换为 NSURL，其中包含字符 '\\'

Question

我用 Swift 2.0.

编码

我的 URL 字符串是这样的：

let urlString = "http://example.com/api/getfile/?filepath=C:\1.txt"

当我把它转换成NSURL时，它returns nil。

let OrginUrl = NSURL(string: urlString)

有人知道怎么做吗？

Answer 1

有两个问题需要解决：

为了包含 \ 必须对其进行转义，因为它本身就是转义字符。

'\' 字符不允许出现在 URL 中，因此需要对它们进行 URL 编码

let urlString = "http://example.com/api/getfile/?filepath=C:\\1.txt"  
print("urlString: \(urlString)")  

var escapedString = urlString.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLHostAllowedCharacterSet())  
print("escapedString!: \(escapedString!)")  

let orginUrl = NSURL(string: escapedString!)  
print("orginUrl: \(orginUrl!)")

urlString:
http://example.com/api/getfile/?filepath=C:\1.txt

escapedString!:
http%3A%2F%2Fexample.com%2Fapi%2Fgetfile%2F%3Ffilepath=C%3A%5C%5C1.txt

orginUrl:
http%3A%2F%2Fexample.com%2Fapi%2Fgetfile%2F%3Ffilepath=C%3A%5C%5C1.txt

Answer 2

你应该使用 unicode 而不是反斜杠两次。

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

Documentation Reference

示例代码如下：

let myLink = "http://example.com/api/getfile/?filepath=C:\u{005C}\u{005C}1.txt"
var newLink = ""
if let queryIndex = myLink.characters.indexOf("?"){
    newLink += myLink.substringToIndex(queryIndex.successor())
    if let filePathIndex = myLink.characters.indexOf("=")?.successor() {
        newLink += myLink.substringWithRange(queryIndex.successor()...filePathIndex.predecessor())
        let filePath =  myLink.substringFromIndex(filePathIndex)
        if let pathEscaped = filePath.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLPathAllowedCharacterSet()) {
            newLink += pathEscaped
        }
    }
}
if let newURL = NSURL(string: newLink) {
    print(newURL, separator: "", terminator: "")
} else {
    print("invalid")
}

结果你会得到：

"http://example.com/api/getfile/?filepath=C%3A%5C%5C1.txt"

将字符串转换为 NSURL，其中包含字符 '\\'

Convert string to NSURL with character '\\' inside

nsurl

ios

swift