NSURL和NSString相互转换、取出NSURL中的scheme和host

NSURL其实就是我们在浏览器上看到的网站地址，这不就是一个字符串么，为什么还要在写一个NSURL呢，主要是因为网站地址的字符串都比较复杂，包括很多请求参数，这样在请求过程中需要解析出来每个部门，所以封装一个NSURL，操作很方便。参考链接

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简单用法:

    NSString *str = @"http://www.jianshu.com";
    // NSString转成NSURL
    NSURL *URL = [NSURL URLWithString:str];
    NSString *scheme = [URL scheme];// 取出协议头
    NSLog(@"%@",scheme);
    NSString *host = [URL host];// 取出主机地址
    NSLog(@"%@",host);
    
    // NSURL转成NSString
    NSString *str1 = [URL absoluteString];
    NSLog(@"%@",str1);

Simple.png

全部用法:

    NSURL *url = [NSURL URLWithString:@"https://www.baidu.com/s?wd=coderzb&rsv_spt=1&rsv_iqid=0x8ec61a4600000289&issp=1&f=8&rsv_bp=0&rsv_idx=2&ie=utf-8&rqlang=&tn=baiduhome_pg&rsv_enter=1&inputT=9743"];
    
    NSLog(@"Scheme: %@", [url scheme]);
    
    NSLog(@"Host: %@", [url host]);
    
    NSLog(@"Port: %@", [url port]);
    
    NSLog(@"Path: %@", [url path]);
    
    NSLog(@"Relative path: %@", [url relativePath]);
    
    NSLog(@"Path components as array: %@", [url pathComponents]);
    
    NSLog(@"Parameter string: %@", [url parameterString]);
    
    NSLog(@"Query: %@", [url query]);
    
    NSLog(@"Fragment: %@", [url fragment]);
    
    NSLog(@"User: %@", [url user]);
    
    NSLog(@"Password: %@", [url password]);

Result.png