iOS 拦截重定向302跳转的方法详解
一：前言
公司同事在做项目的时候遇到一个302地址跳转的问题，具体需求如下:
1、公司是做WIFI覆盖的，需要在下载APP后才能注册登录以后，自动连接到外网
2、苹果底层不允许我们码农进行WIFI的切换，所以公司考虑使用302重定向来实现，我通过2种方法来实现，NSURLConnetion和NSURLSession
二：NSURLConnetion方法
大概的思路:使用NSURLConnetion类的NSURLConnectionDataDelegate中的代理方法
-(nullableNSURLRequest*)connection:(NSURLConnection*)connectionwillSendRequest:(NSURLRequest*)requestredirectResponse:(nullableNSURLResponse*)response
都是码农，直接上代码吧
新建一个DEMO项目的话，记得把AppTransportSecuritySettingsAllowArbitraryLoads设置为YES，否则无法请求网络
-(void)viewDidLoad{
[superviewDidLoad];
NSURL*url=[NSURLURLWithString:@"http://www.google.com"];
NSMutableURLRequest*quest=[NSMutableURLRequestrequestWithURL:url];
quest.HTTPMethod=@"GET";
NSURLConnection*connect=[NSURLConnectionconnectionWithRequest:questdelegate:self];
[connectstart];
}
-(nullableNSURLRequest*)connection:(NSURLConnection*)connectionwillSendRequest:(NSURLRequest*)requestredirectResponse:(nullableNSURLResponse*)response{
NSHTTPURLResponse*urlResponse=(NSHTTPURLResponse*)response;
NSLog(@"%ld",urlResponse.statusCode);
NSLog(@"%@",urlResponse.allHeaderFields);
NSDictionary*dic=urlResponse.allHeaderFields;
NSLog(@"%@",dic[@"Location"]);
returnrequest;
}
request是你要发送的请求urlResponse.statusCode则是请求的状态码,302则是重定向。urlResponse.allHeaderFields中保存着http的头信息:
{
Connection=close;
"Content-Type"="text/html";
Date="Mon,30May201604:00:49GMT";
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="HughesTechnologiesEmbeddedServer";
}
通过urlResponse.allHeaderFields[@"Location"]即可拿到302跳转的url地址.如果需要拦截掉这个url地址跳转，则可在代理方法中自定义一个request
-(void)URLSession:(NSURLSession*)sessiontask:(NSURLSessionTask*)task
willPerformHTTPRedirection:(NSHTTPURLResponse*)response
newRequest:(NSURLRequest*)request
completionHandler:(void(^)(NSURLRequest*__nullable))completionHandler{
//block为nil，则直接拦截掉302的url地址，防止自动跳转
completionHandler(nil);
}
则直接拦截掉302的url地址，防止自动跳转completionHandler(nil);}
三：NSURLSession方法
-(void)viewDidLoad{
[superviewDidLoad];
NSURL*url=[NSURLURLWithString:@"http://www.google.com"];
NSMutableURLRequest*quest=[NSMutableURLRequestrequestWithURL:url];
quest.HTTPMethod=@"GET";
NSURLSessionConfiguration*config=[NSURLSessionConfigurationdefaultSessionConfiguration];
config.requestCachePolicy=NSURLRequestReloadIgnoringLocalCacheData;
NSURLSession*urlSession=[NSURLSessionsessionWithConfiguration:configdelegate:selfdelegateQueue:[NSOperationQueuecurrentQueue]];
NSURLSessionDataTask*task=[urlSessiondataTaskWithRequest:questcompletionHandler:^(NSData*_Nullabledata,NSURLResponse*_Nullableresponse,NSError*_Nullableerror){
NSHTTPURLResponse*urlResponse=(NSHTTPURLResponse*)response;
NSLog(@"%ld",urlResponse.statusCode);
NSLog(@"%@",urlResponse.allHeaderFields);
NSDictionary*dic=urlResponse.allHeaderFields;
NSLog(@"%@",dic[@"Location"]);
}];
[taskresume];
}
-(void)URLSession:(NSURLSession*)sessiontask:(NSURLSessionTask*)task
willPerformHTTPRedirection:(NSHTTPURLResponse*)response
newRequest:(NSURLRequest*)request
completionHandler:(void(^)(NSURLRequest*__nullable))completionHandler{
completionHandler(nil);
}
使用方法和第一种方法一样
Demo下载
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