如何在NSURL中使用特殊字符？

Question

我的应用程序正在使用NSURL,如下所示:

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

当我尝试从这个NSURL获取数据的任务时,如下所示:

    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")
        }

但是当我试图从该地址获取数据时我遇到了错误,虽然当我使用safari时链接:" http://www.geonames.org/search.html?q =Aïn+Béïda+ Algeria&country ="我可以看到数据.我该如何解决这个问题？

Answer 1

斯威夫特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= "

和兼容NSURLSession.

斯威夫特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)
}