ios获取url域名

import Foundation

func getDomain(from urlString: String) -> String? {
    guard let url = URL(string: urlString) else { return nil }
    return url.host
}

let urlString = "https://www.example.com/path/to/resource"
if let domain = getDomain(from: urlString) {
    print("Domain: \(domain)") // 输出: Domain: www.example.com
} else {
    print("Invalid URL")
}

// 示例：处理相对URL
let baseURL = URL(string: "https://www.example.com/")!
let relativeURLString = "/path/to/resource"
if let relativeURL = URL(string: relativeURLString, relativeTo: baseURL) {
    print("Absolute URL: \(relativeURL.absoluteString)")
    if let domain = relativeURL.host {
        print("Domain: \(domain)") // 输出: Domain: www.example.com
    }
}