iOS 攔截重定向302跳轉(zhuǎn)的方法詳解

更新時間：2017年05月10日 16:45:17 作者：Biny

這篇文章主要介紹了iOS 攔截重定向302跳轉(zhuǎn)的方法詳解，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

一：前言

公司同事在做項(xiàng)目的時候遇到一個302地址跳轉(zhuǎn)的問題，具體需求如下:

1、公司是做WIFI覆蓋的，需要在下載APP后才能注冊登錄以后，自動連接到外網(wǎng)

2、蘋果底層不允許我們碼農(nóng)進(jìn)行WIFI的切換，所以公司考慮使用302重定向來實(shí)現(xiàn)，我通過2種方法來實(shí)現(xiàn)，NSURLConnetion和NSURLSession

二：NSURLConnetion方法

大概的思路:使用NSURLConnetion類的NSURLConnectionDataDelegate中的代理方法

復(fù)制代碼代碼如下:

- (nullable NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(nullable NSURLResponse *)response

都是碼農(nóng)，直接上代碼吧

新建一個DEMO項(xiàng)目的話，記得把App Transport Security Settings Allow Arbitrary Loads設(shè)置為YES，否則無法請求網(wǎng)絡(luò)

- (void)viewDidLoad {
  [super viewDidLoad];
 NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
  NSMutableURLRequest *quest = [NSMutableURLRequest requestWithURL:url];
  quest.HTTPMethod = @"GET";
  NSURLConnection *connect = [NSURLConnection connectionWithRequest:quest delegate:self];
  [connect start];
}

- (nullable NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(nullable NSURLResponse *)response{

  NSHTTPURLResponse *urlResponse = (NSHTTPURLResponse *)response;

  NSLog(@"%ld",urlResponse.statusCode);
  NSLog(@"%@",urlResponse.allHeaderFields);
  NSDictionary *dic = urlResponse.allHeaderFields;
  NSLog(@"%@",dic[@"Location"]);
  return request;
}

request 是你要發(fā)送的請求 urlResponse.statusCode 則是請求的狀態(tài)碼,302則是重定向。urlResponse.allHeaderFields中保存著http的頭信息:

{
  Connection = close;
  "Content-Type" = "text/html";
  Date = "Mon, 30 May 2016 04:00:49 GMT";
  Location = "http://118.244.233.137:6001/login/?gw_address=192.168.17.1&gw_port=2060&gw_id=ctzx_11&ip=192.168.17.24&mac=54:72:4f:30:c6:10&url=http%3A%2F%2Fwww.google.com%2F";
  Server = "Hughes Technologies Embedded Server";
}

通過urlResponse.allHeaderFields[@"Location"]即可拿到302跳轉(zhuǎn)的url地址.如果需要攔截掉這個url地址跳轉(zhuǎn)，則可在代理方法中自定義一個request

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
willPerformHTTPRedirection:(NSHTTPURLResponse *)response
    newRequest:(NSURLRequest *)request
 completionHandler:(void (^)(NSURLRequest * __nullable))completionHandler{

  //block為nil，則直接攔截掉302的url地址，防止自動跳轉(zhuǎn)
  completionHandler(nil);

}

則直接攔截掉302的url地址，防止自動跳轉(zhuǎn) completionHandler(nil);}

三：NSURLSession方法

- (void)viewDidLoad {
  [super viewDidLoad];
  NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
  NSMutableURLRequest *quest = [NSMutableURLRequest requestWithURL:url];
  quest.HTTPMethod = @"GET";
  NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
  config.requestCachePolicy = NSURLRequestReloadIgnoringLocalCacheData;
  NSURLSession *urlSession = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:[NSOperationQueue currentQueue]];

  NSURLSessionDataTask *task = [urlSession dataTaskWithRequest:quest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

    NSHTTPURLResponse *urlResponse = (NSHTTPURLResponse *)response;

    NSLog(@"%ld",urlResponse.statusCode);
    NSLog(@"%@",urlResponse.allHeaderFields);

    NSDictionary *dic = urlResponse.allHeaderFields;
    NSLog(@"%@",dic[@"Location"]);

  }];

  [task resume];

}


- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
willPerformHTTPRedirection:(NSHTTPURLResponse *)response
    newRequest:(NSURLRequest *)request
 completionHandler:(void (^)(NSURLRequest * __nullable))completionHandler{

  completionHandler(nil);

}

使用方法和第一種方法一樣

Demo下載

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