?一：前言
公司同事在做項目的時候遇到一個302地址跳轉的問題，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
2、蘋果底層不允許我們碼農進行WIFI的切換，所以公司考慮使用302重定向來實現，我通過2種方法來實現，NSURLConnetion和NSURLSession
二：NSURLConnetion方法
大概的思路:使用NSURLConnetion類的NSURLConnectionDataDelegate中的代理方法
都是碼農，直接上代碼吧
新建一個DEMO項目的話，記得把App Transport Security Settings Allow Arbitrary Loads設置為YES，否則無法請求網絡
- (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 是你要發送的請求 urlResponse.statusCode 則是請求的狀態碼,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跳轉的url地址.如果需要攔截掉這個url地址跳轉，則可在代理方法中自定義一個request
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)taskwillPerformHTTPRedirection:(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 completionHandler(nil);}則直接攔截掉302的url地址，防止自動跳轉 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 *)taskwillPerformHTTPRedirection:(NSHTTPURLResponse *)response newRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURLRequest * __nullable))completionHandler{ completionHandler(nil);}使用方法和第一種方法一樣
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