目标-C

NSString* urlString = @"http://someurl.com/something";
NSURL* url = [NSURL URLWithString:urlString];
NSString* domain = [url host];

雨燕2

var urlString = "http://someurl.com/something"
var url = NSURL(string: urlString)
var domain = url?.host

雨燕3+

var urlString = "http://someurl.com/something"
var url = URL(string: urlString)
var domain = url?.host

用途

[[NSURL URLWithString:@"http://someurl.com/something"] host]

雨燕4.2

我写了扩展的URL采取SLD。似乎，有n

extension URL {
    /// second-level domain [SLD]
    ///
    /// i.e. `msk.ru, spb.ru`
    var SLD: String? {
        return host?.components(separatedBy: ".").suffix(2).joined(separator: ".")
    }
}

"雨燕5"
string的扩展名，它给出了域名，同时还删除了“www”。

extension String {
func StripURLMakeAttractive(_ url: String) -> String {
        
    let url = URL(string: url)
    guard let domain = url?.host else {return "error"}
    var modifiedDomain: String = ""
    
    var checkWWW: String = ""
    let checkIndexes = [0,1,2,3]

    for (index,char) in domain.enumerated() {
        if checkIndexes.contains(index){
            checkWWW.append(char)
        }
        if index > 3 && checkWWW.lowercased() == "www."  {
            modifiedDomain.append(char)
        }
    }
    
    if checkWWW.lowercased() == "www."{
        return modifiedDomain
    }
    else {
        return domain
    }
    
}

}

您应该查看NSURL类的host（）方法。

雨燕5.5

extension String {
    var onlyHost: String? {
        let url = URL(string: self)
        return url?.host
    }
}

雨燕4

如果您使用自定义url方案，则表示用于深度链接，例如：

myapp:homescreen

(and我没有“正斜杠与主机名”（//www.bbc）），一个解决方案，为我工作，以提取“主屏幕”是通过下面的using the index方法，然后pattern matching刮取":"后的一切

let index = absoluteString.index(absoluteString.startIndex, offsetBy: 5)
String(absoluteString[index...])

url.host或absoluteURL.host在此方案中为**nil**