解決方法：
在info.plist 加入key
<key>NSAppTransportSecurity</key><dict><key>NSAllowsArbitraryLoads</key><true/></dict>
下面給大家介紹ios中http 和https 協議的訪問
最近做個項目，開始采用的是HTTP協議實現客戶端和服務器端的交互，后來需要改成HTTPS協議。在修改的過程中發現了一些問題，解決方案如下：
HTTP：
NSString *urlString =[NSString stringWithFormat:@"https://127.0.0.1/default.aspx?USER=%@",@"111"];NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];[request setURL:[NSURL URLWithString:urlString]];[request setHTTPMethod:@"GET"];NSHTTPURLResponse* urlResponse = nil;NSError *error = [[NSError alloc] init];NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];NSMutableString *result = [[NSMutableString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];NSLog(@"The result string is :%@",result);
HTTPS
事件觸發
{ NSString *urlString =[NSString stringWithFormat:@"https://127.0.0.1/default.aspx?USER=%@",@"111"];NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:urlString] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:5];//設置請求方式為get[request setHTTPMethod:@"GET"];//添加用戶會話id[request addValue:@"text/html" forHTTPHeaderField:@"Content-Type"];//連接發送請求finished = false;NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];//堵塞線程，等待結束while(!finished) {[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];}} - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse*)response {}- (void)connectionDidFinishLoading:(NSURLConnection *)connection {//[_waitingDialog dismissWithClickedButtonIndex:0 animated:NO];[connection release];}-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ }- (BOOL)connectionShouldUseCredentialStorage:(NSURLConnection *)connection{return NO;}//下面兩段是重點，要服務器端單項HTTPS 驗證，iOS 客戶端忽略證書驗證。- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];} - (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge { NSLog(@"didReceiveAuthenticationChallenge %@ %zd", [[challenge protectionSpace] authenticationMethod], (ssize_t) [challenge previousFailureCount]);if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]){[[challenge sender] useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];[[challenge sender] continueWithoutCredentialForAuthenticationChallenge: challenge];}} NSLog(@"get the whole response");//[receivedData setLength:0];}//處理數據 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ } 
