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我在如何从“TabBarViewController”注销到“UIViewController”时遇到问题。首先，我从 UIViewController 页面登录（使用 SOAP Web 服务 + XML 解析），如果用户 ID 和密码正确，则在数据库中生成“访问令牌”并且（使用我们页面中的 XML 解析在变量中收集）并加载 TabBarViewController （用户个人资料页面）。现在登录后我想“注销”。在个人资料页面上，我放置了一个名为“注销”的按钮。

现在在这里，我需要您的帮助，如何使用“访问令牌”（在成功登录期间生成）注销，以便我再次返回登录页面 ?????

下面是当我在 UITextField 中输入“用户 ID”和“密码”后按“登录”按钮时运行的代码：

-(IBAction)Login{

   txtuser.text = @"test";
   txtpwd.text = @"test";

    if([txtuser.text isEqualToString:@"" ]|| [txtpwd.text isEqualToString:@""]) 
    {
        UIAlertView *myAlert = [[UIAlertView alloc]
                                initWithTitle:nil message:@"Please fill all fields" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [myAlert show];
        [myAlert release];
    }
    else
    {

    md5 =[txtpwd text];

   //Calling MD5 Method to Convert password into "hashcode"(Hexadecimal) formate
    md5 = [md5 MD5];

    NSLog(@"%@",md5);
    itmselected =FALSE;

// 调用 Web 服务方法

    NSString *soapmessage = [NSString stringWithFormat:@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
                             "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"
                             "<soap:Body>\n"
                             "<Login xmlns=\"http://boleapp.com/\">\n"
                             "<UserName>%@</UserName>\n"
                             "<PassHash>%@</PassHash>\n"
                             "</Login>\n"
                             " </soap:Body>\n"
                             " </soap:Envelope>\n",[txtuser text],md5];
    NSLog(@"%@",soapmessage);
    NSURL *url = [NSURL URLWithString:@"http://weibotest.dotnetgeekz.com/servicemain.asmx"];
    NSMutableURLRequest *req = [[NSMutableURLRequest alloc]initWithURL:url];

    NSString *msglength = [NSString stringWithFormat:@"%d",[soapmessage length]];
    [req addValue:@" text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [req addValue:@"http://boleapp.com/Login" forHTTPHeaderField:@"SOAPAction"];
    [req addValue:msglength forHTTPHeaderField:@"Content-Length"];
    [req setHTTPMethod:@"POST"];
    [req setHTTPBody:[soapmessage dataUsingEncoding:NSUTF8StringEncoding]];
    [NSURLConnection connectionWithRequest:req delegate:self];
    webadata = [[NSMutableData alloc]init];
    [txtuser resignFirstResponder];
    [txtpwd resignFirstResponder];   
    }
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    [webadata appendData:data];    
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    NSLog(@"error");
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    xmlparser = [[NSXMLParser alloc]initWithData:webadata];
    [xmlparser setDelegate:self];
    [xmlparser parse];
}

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{


    if([elementName isEqualToString:@"Login"])

        soapresult = [[NSMutableString alloc]init];
    itmselected = YES;

}

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    if(itmselected){
        NSLog(@"Bool value and Access Token Number and UserID= %@",string);

        if([string isEqualToString:@"false"]){
            [invaliduser setImage:[UIImage imageNamed:@"invalid_username.png"]];

        }
        else{
        NSArray* splits = [string componentsSeparatedByString: @","];
        NSString *strbool = [splits objectAtIndex:0];
        NSString *strAtoken = [splits objectAtIndex:1];
        id UserIdLogin = [splits objectAtIndex:2];
         if ([strbool isEqualToString:@"true"]){

             main.strAccessTokenMain = strAtoken; 
             main.UserIdMain = UserIdLogin;
             NSLog(@"strAccessTokenMain = %@",[main strAccessTokenMain]);

             // Calling "showtabbar" method for Loading TabBarViewController page
             [main showtabbar];      
        }
        }
        [soapresult appendString:string]; 
    }
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{

    if([elementName isEqualToString:@"LoginResult"]){
        itmselected = NO;
    }
}

// 用于启动 TabBarViewController 的 "showtabbar" 方法

-（无效）显示标签栏{

//Removing UIViewController's 'Login' page
[self.view removeFromSuperview];
[BoleApp release];

NSLog(@"userID = %@",UserIdMain);
tabbarcontroller = [[UITabBarController alloc]init ];

//Creating Object of "Profile" Class for Launching as First tab of TabBarViewController
profile *view1 = [[profile alloc]initWithNibName:@"profile" bundle:nil ];
view1.strAccessToken = strAccessTokenMain;
view1.UserIdProfile = UserIdMain;
NSLog(@"view1str = %@",view1.strAccessToken);
view1.title = @"Profile";
view1.tabBarItem.image = [UIImage imageNamed:@"profile.png"];   

//Second Tab of TabBarViewController
Brandslist *view2 = [[Brandslist alloc]init];
view2.BrandAccToken = strAccessTokenMain;
view2.UserIdBrndList = UserIdMain;
Instruction *view3 = [[Instruction alloc]init];
settings *view4 = [[settings alloc]init];
view2.title = @"Brands";
view2.tabBarItem.image = [UIImage imageNamed:@"brands.png"];

// Third Tab of TabBarViewController
view3.title = @"Info";
view3.tabBarItem.image = [UIImage imageNamed:@"info.png"];

// Fourth Tab of TabBarViewController
view4.title = @"Settings";
view4.tabBarItem.image = [UIImage imageNamed:@"settings.png"];
view4.AccessToken = strAccessTokenMain;
view4.user_ID = UserIdMain;

[tabbarcontroller setViewControllers:[NSArray arrayWithObjects:view1,view2,view3,view4, nil]];

[mainWindow addSubview:tabbarcontroller.view];

}

这是我的个人资料页面的“注销”方法，我想在其中编写从个人资料页面注销到登录页面的代码（UIViewController）

-(IBAction)Logout{
    NSLog(@"Logout Button Clicked !!!");
  // What to code here for resuming back to Login page ????? Please Help me out 
    ?
    ?
    ?
}

朋友，请恢复。您的帮助将不胜感激。谢谢， Tauseef Khan

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2 回答 2

1

而不是使用, [mainWindow addSubview], 使用mainWindow.rootViewController = tabbarcontroller;

这样，当按下注销按钮时，您只需要添加如下内容：

mainWindow.rootViewController = loginViewController;

使用它，您只需更改主窗口上显示的视图控制器，您可以在新登录后以相同的方式再次切换到选项卡栏控制器。

于 2012-06-26T22:11:25.813 回答
0

loginViewController显示为模态视图控制器会很方便。这样，loginViewController如果服务器返回授权错误，您始终可以呈现模式。

于 2012-06-26T22:43:23.607 回答