cocoa-touch - 获取 URL 字符串的域部分？

Question

我有一个带有 URL 的 NSString，以这种方式:

http://someurl.com/something

我怎样才能只获得 someurl.com？我已经尝试过 substringToIndex 但没有成功 :(

提前致谢:)

Answer 1

objective-C

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

swift 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