获取URL字符串的域名部分？

Question

我有一个带有URL的NSString,这样:

http://someurl.com/something

我怎么才能得到someurl.com？我已经尝试substringToIndex过没有运气:(

提前致谢 :)

Answer 1

Objective-C的

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

斯威夫特2

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

Swift 3+

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

Answer 2

使用

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

Answer 3

斯威夫特 4.2

我为 URL 编写了扩展程序以获取 SLD。好像有n

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