如何在 NSURL 中使用特殊字符?

How to use special character in NSURL?

我的应用程序正在使用这样的 NSURL:

var url = NSURL(string: "http://www.geonames.org/search.html?q=Aïn+Béïda+Algeria&country=")

当我尝试像这样从这个 NSURL 获取数据时:

    let task = NSURLSession.sharedSession().dataTaskWithURL(url!, completionHandler: { (data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in

        if error == nil {

            var urlContent = NSString(data: data, encoding: NSUTF8StringEncoding)
            println("urlContent \(urlContent!)")
        } else {

            println("error mode")
        }

但是当我尝试从该地址获取数据时出现错误,尽管当我使用 safari 转到 link: "http://www.geonames.org/search.html?q=Aïn+Béïda+Algeria&country=" 我可以看到数据.我该如何解决?

Swift 2

let original = "http://www.geonames.org/search.html?q=Aïn+Béïda+Algeria&country="
if let encodedString = original.stringByAddingPercentEncodingWithAllowedCharacters(
    NSCharacterSet.URLFragmentAllowedCharacterSet()),
    url = NSURL(string: encodedString) 
{
    print(url)
}

编码的 URL 现在是:

"http://www.geonames.org/search.html?q=A%C3%AFn+B%C3%A9%C3%AFda+Algeria&country="

并与 NSURLSession.

兼容

Swift 3

let original = "http://www.geonames.org/search.html?q=Aïn+Béïda+Algeria&country="
if let encoded = original.addingPercentEncoding(withAllowedCharacters: .urlFragmentAllowed),
    let url = URL(string: encoded)
{
    print(url)
}