presentModalViewController not responding

Question

我有3個類。

第一個控制器是tabbar中的第一個控制器。我正在使用presentModalViewController來顯示登錄屏幕和主屏幕。我有一個presentModalViewController在firstcontrollor中呈現登錄屏幕，並在Loginscreen viewdidload方法中，我有presentModalViewController，它呈現主屏幕。主屏幕presentModalViewController在homePage_Btn_Clicked中被解除，presentModalViewController在login_Btn_Clicked中被解除。我的問題是我的主屏幕從未出現過。任何幫助？我是iPhone開發新手。

//First Controllor 

FirstControllor.m

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    Accounts_Login *lvc = [[Accounts_Login alloc]initWithNibName:@"Accounts_Login" bundle:[NSBundle mainBundle]]; 
    [self presentModalViewController:lvc animated:NO];  
    [lvc release]; 

} 

//Login_view class 

Login_view.m

- (void)viewDidLoad { 

    [super viewDidLoad]; 

    Home_Screen *lvc1 = [[Home_Screen alloc]initWithNibName:@"Home_Screen" bundle:[NSBundle mainBundle]]; 
    [self presentModalViewController:lvc1 animated:NO];  
    [lvc1 release]; 

    user_ID_TextField.text = [[NSUserDefaults standardUserDefaults] objectForKey:@"User ID"]; 

} 

-(IBAction) login_Btn_Clicked{ 

    if ([services authenticate:credential_Data]) { 

     [self dismissModalViewControllerAnimated:YES]; 

    [credential_Data autorelease]; 
} 

//HomePage class 

HomePage.m

-(IBAction) homePage_Btn_Clicked:(id) sender{ 

    UIButton *theButton = (UIButton *)sender; 

    int count; 

    switch (theButton.tag) { 

     case 101: 
      count++; 
      [self dismissModalViewControllerAnimated:YES]; 
      break; 
     default: 
      break; 
    } 

} 

Answer 1

試試這個：

Home_Screen *lvc1 = [[Home_Screen alloc]initWithNibName:@"Home_Screen" bundle:[NSBundle mainBundle]]; 
[self.parentViewController presentModalViewController:lvc1 animated:NO];  
[lvc1 release]; 

Answer 2

移動presentModalView從viewDidLoad中至viewDidAppear。