IOS- XMPP - 在登录按钮上进行身份验证和警报 View

Question

目前我正在为聊天应用开发 iOS 中的 XMPP 协议(protocol)。我想在登录按钮上放置警报 View 和身份验证。如果身份验证成功，则用户可以看到主屏幕屏幕，否则将出现警报 View 请检查用户名和密码 我展示了安全聊天 开源项目，但我无法理解。

//appdelegate.m file .//
- (BOOL)connect
{
if (![xmppStream isDisconnected]) {
    return YES;
   // isauthenticate=YES;
}
  NSString *myJID = [[NSUserDefaults standardUserDefaults] stringForKey:kXMPPmyJID];
NSString *myPassword = [[NSUserDefaults standardUserDefaults] stringForKey:kXMPPmyPassword];

//
// If you don't want to use the Settings view to set the JID,
// uncomment the section below to hard code a JID and password.
//
// myJID = @"user@gmail.com/xmppframework";
// myPassword = @"";

if (myJID == nil || myPassword == nil) {
    return NO;
}

[xmppStream setMyJID:[XMPPJID jidWithString:myJID]];
password = myPassword;

NSError *error = nil;
if (![xmppStream connectWithTimeout:XMPPStreamTimeoutNone error:&error])
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error connecting"
                                                        message:@"See console for error details."
                                                       delegate:nil
                                              cancelButtonTitle:@"Ok"
                                              otherButtonTitles:nil];
    [alertView show];

    DDLogError(@"Error connecting: %@", error);

    return NO;
}

return YES;
}
- (void)disconnect
{
 [self goOffline];
 [xmppStream disconnect];
}

#pragma mark UIApplicationDelegate

 - (void)applicationDidEnterBackground:(UIApplication *)application
{

DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

#if TARGET_IPHONE_SIMULATOR
DDLogError(@"The iPhone simulator does not process background   network traffic. "
           @"Inbound traffic is queued until the keepAliveTimeout:handler: fires.");
#endif

if ([application respondsToSelector:@selector(setKeepAliveTimeout:handler:)])
{
    [application setKeepAliveTimeout:600 handler:^{

        DDLogVerbose(@"KeepAliveHandler");

        // Do other keep alive stuff here.
    }];
}
}

 - (void)applicationWillEnterForeground:(UIApplication *)application
  {
     DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

  - (void)applicationWillTerminate:(UIApplication *)application
 {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

    [self teardownStream];
 }

          #pragma mark XMPPStream Delegate

    - (void)xmppStream:(XMPPStream *)sender socketDidConnect:(GCDAsyncSocket *)socket
  {
     DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

 - (void)xmppStream:(XMPPStream *)sender willSecureWithSettings:(NSMutableDictionary *)settings
 {
   DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

   NSString *expectedCertName = [xmppStream.myJID domain];
   if (expectedCertName)
  {
    settings[(NSString *) kCFStreamSSLPeerName] = expectedCertName;
   }

if (customCertEvaluation)
{
    settings[GCDAsyncSocketManuallyEvaluateTrust] = @(YES);
}
}

- (void)xmppStream:(XMPPStream *)sender didReceiveTrust:(SecTrustRef)trust
completionHandler:(void (^)(BOOL shouldTrustPeer))completionHandler
{
  DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

   // The delegate method should likely have code similar to this,
   // but will presumably perform some extra security code stuff.
  // For example, allowing a specific self-signed certificate that is known to the app.

  dispatch_queue_t bgQueue =    dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(bgQueue, ^{

    SecTrustResultType result = kSecTrustResultDeny;
    OSStatus status = SecTrustEvaluate(trust, &result);

    if (status == noErr && (result == kSecTrustResultProceed || result == kSecTrustResultUnspecified)) {
        completionHandler(YES);
    }
    else {
        completionHandler(NO);
    }
   });
  }

  - (void)xmppStreamDidSecure:(XMPPStream *)sender
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
   }

  - (void)xmppStreamDidConnect:(XMPPStream *)sender
{
DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);


isXmppConnected = YES;

NSError *error = nil;

if (![[self xmppStream] authenticateWithPassword:password error:&error])
{
    DDLogError(@"Error authenticating: %@", error);
}
}

  - (void)xmppStreamDidAuthenticate:(XMPPStream *)sender

{
  isauthenticate=YES;

DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

[self goOnline];
}

 - (void)xmppStream:(XMPPStream *)sender didNotAuthenticate:(NSXMLElement *)error
{
DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
}

我尝试在 xmppStreamDidAuthenticate 方法中设置 BOOL(isauthenticate) 但没有成功。我可以重定向到主页，但如果我写错了详细信息，它仍然会重定向到主页。如果用户名或密码错误并且未通过服务器验证，我想设置它。

     //view controller.m file //
  #import "ViewController.h"
 #import "AppDelegate.h"
@interface ViewController ()<MBProgressHUDDelegate>
{
  MBProgressHUD *HUD;

  IBOutlet UITextField *mViewEmail;
  IBOutlet UITextField *mViewPassword;
 }

@end

 NSString *const kXMPPmyJID = @"kXMPPmyJID";
 NSString *const kXMPPmyPassword = @"kXMPPmyPassword";



 @implementation ViewController

- (IBAction)checkLogin:(id)sender {
  NSLog(@"Email: %@  Password: %@",mViewEmail.text,mViewPassword.text);
[self setField:mViewEmail forKey:kXMPPmyJID];
[self setField:mViewPassword forKey:kXMPPmyPassword];


 // if (appdelegate.connect==YES) {


  if([ [self appDelegate] connect])    {



  //  if (appdelegate.isauthenticate==YES) {



    HUD = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES] ;
    HUD.delegate = self;
    HUD.color = [UIColor blackColor];
    HUD.labelText = @"Please Wait";
    HUD.dimBackground = YES;
    //  HUD.detailsLabelText = @"Close chat";


   [self showHome];

    //}


  }
 //}
 else
 {

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sorry"
                                                    message:@"Please Check Username or Password"
                                                   delegate:nil   cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];

}

 }

 - (void)showHome{
[self performSegueWithIdentifier:@"signIn" sender:self];
 }

Answer 1

好的。所以我的问题终于解决了。我正在发布我的答案。首先我的错误是我忘了写

   appdelegate = (AppDelegate*)[[UIApplication sharedApplication]delegate];
   appdelegate.viewController = self; // very imp when you call method in app delegate.h

在我的 View Controller 中。因此，当我在 appdelegate 中调用 viewcontroller 的方法时，它会调用但由于缺少上述方法而不会执行(第二行)。然后我在 - (void)xmppStreamDidAuthenticate:(XMPPStream *)sender 方法中调用了 View Controller 的 segue 方法。然后完美地工作。所以我最终的解决方案是

    //app delegate.m file//
   - (BOOL)connect
  {
    // Setup HUD(Activity Indicator) when Connect method call //

 HUD = [[MBProgressHUD alloc] initWithWindow:[UIApplication sharedApplication].keyWindow];    [self.window.rootViewController.view addSubview:HUD];
[HUD setDetailsLabelText:@"Please wait..."];
[HUD setDimBackground:YES];
[HUD setOpacity:0.5f];
[HUD show:YES];

if (![xmppStream isDisconnected]) {
    return YES;
}

NSString *myJID = [[NSUserDefaults standardUserDefaults] stringForKey:kXMPPmyJID];
NSString *myPassword = [[NSUserDefaults standardUserDefaults] stringForKey:kXMPPmyPassword];


if (myJID == nil || myPassword == nil) {
    return NO;
}

[xmppStream setMyJID:[XMPPJID jidWithString:myJID]];
password = myPassword;

NSError *error = nil;
if (![xmppStream connectWithTimeout:XMPPStreamTimeoutNone error:&error])
{
    HUD.hidden=YES;
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error connecting"
                                                           message:@"See console for error details."
                                                       delegate:nil
                                              cancelButtonTitle:@"Ok"
                                              otherButtonTitles:nil];
    [alertView show];

    DDLogError(@"Error connecting: %@", error);

    return NO;

 }

  return YES;
 }

 - (void)disconnect
  {
  [self goOffline];
  [xmppStream disconnect];
  }

#pragma mark UIApplicationDelegate

  - (void)applicationDidEnterBackground:(UIApplication *)application
 {


DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

  #if TARGET_IPHONE_SIMULATOR
  DDLogError(@"The iPhone simulator does not process background network traffic. "
           @"Inbound traffic is queued until the keepAliveTimeout:handler: fires.");
   #endif

   if ([application respondsToSelector:@selector(setKeepAliveTimeout:handler:)])
   {
    [application setKeepAliveTimeout:600 handler:^{

        DDLogVerbose(@"KeepAliveHandler");

        // Do other keep alive stuff here.
      }];
    }
   }

  - (void)applicationWillEnterForeground:(UIApplication *)application
{
DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
}

 - (void)applicationWillTerminate:(UIApplication *)application
{
DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

[self teardownStream];
 }

  #pragma mark XMPPStream Delegate


  - (void)xmppStream:(XMPPStream *)sender socketDidConnect:(GCDAsyncSocket *)socket
 {
DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

 - (void)xmppStream:(XMPPStream *)sender willSecureWithSettings:(NSMutableDictionary *)settings
  {
  DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

   NSString *expectedCertName = [xmppStream.myJID domain];
 if (expectedCertName)
 {
    settings[(NSString *) kCFStreamSSLPeerName] = expectedCertName;
 }

 if (customCertEvaluation)
 {
    settings[GCDAsyncSocketManuallyEvaluateTrust] = @(YES);
 }
}


   - (void)xmppStream:(XMPPStream *)sender didReceiveTrust:(SecTrustRef)trust
  completionHandler:(void (^)(BOOL shouldTrustPeer))completionHandler
  {
      DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);


    dispatch_queue_t bgQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_async(bgQueue, ^{

    SecTrustResultType result = kSecTrustResultDeny;
    OSStatus status = SecTrustEvaluate(trust, &result);

    if (status == noErr && (result == kSecTrustResultProceed || result == kSecTrustResultUnspecified)) {
        completionHandler(YES);
     }
     else {
        completionHandler(NO);
    }
  });
}

  - (void)xmppStreamDidSecure:(XMPPStream *)sender
{
DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
 }

  - (void)xmppStreamDidConnect:(XMPPStream *)sender
 {
DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);


   isXmppConnected = YES;

   NSError *error = nil;

  if (![[self xmppStream] authenticateWithPassword:password error:&error])
  {
      DDLogError(@"Error authenticating: %@", error);
  }
}

- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender

 {
      HUD.hidden=YES; //Hud Will be hide when User Authenticated


     DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
     [self.viewController showHome];  // view controllers method to go to next view controller //

[self goOnline];
}

   - (void)xmppStream:(XMPPStream *)sender didNotAuthenticate:(NSXMLElement *)error
{
// HUD will be hidden and alertview will be shown //

 HUD.hidden=YES;
 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sorry"
                                                message:@"Please Check Username or Password"
                                               delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
   [alert show];


 isauthenticate=NO;
 DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
 {
    NSLog(@"error = %@", error);
 }

}

并且在 viewcontroller.m 中我们展示了 viewcontroller 也是 appdelegate Controller 。所以我们必须在 - (void)viewDidLoad 方法中声明它。

// viewcontroller.m file//
- (void)viewDidLoad
 {
[super viewDidLoad];
    appdelegate = (AppDelegate*)[[UIApplication sharedApplication]delegate];
   appdelegate.viewController = self;
  }

 - (AppDelegate *)appDelegate
 {
  return (AppDelegate *)[[UIApplication sharedApplication] delegate];
 }

    - (IBAction)checkLogin:(id)sender {
     [self dismissKeyboard];
     NSLog(@"Email: %@  Password: %@",mViewEmail.text,mViewPassword.text);
     [self setField:mViewEmail forKey:kXMPPmyJID];
     [self setField:mViewPassword forKey:kXMPPmyPassword];

     [[self appDelegate ]connect];//call when loginbutton pressed 

      }

     //call in appdelegate.h // segue(push) to next view

     - (void)showHome
      {
    [self performSegueWithIdentifier:@"signIn" sender:self];
       }

注意:我已尽力解释。