Infobutton not Displaying ModalView - iphone

Question

When pressing infobutton it is not displaying ModalView
UIBarButtonItem *infoItem = [[UIBarButtonItem alloc]
initWithTitle:#"Info"
style:UIBarButtonItemStyleBordered
target:self
action:#selector(displayModalView:)];
- (void)displayModalView
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController = [[Infoviewcontroller alloc] init];
UINavigationController *navigationController=[[UINavigationController alloc] init];
navigationController.navigationBar.tintColor = [UIColor brownColor];
[navigationController pushViewController:_viewController animated:YES];
[_window addSubview:navigationController.view];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
}
Anyone can help me please what is the problem in this.
Thanks a lot in advance for helping me out

Answer 1

In your question you didn't specify how you created your objects (the toolBar and the buttons on it), are you creating them from Xcode by dragging and dropping or from pure code, therefore I will try to point out the common issues for both cases.
First, I am assuming that you are using Xcode and dragging the components that you like. In this case you need to create in the .h file an Outlet that will be linked to the button on the bar as follows:
#interface yourViewController : UIViewController
{
UIBarButtonItem *barButton;
}
#property (nonatomic, retain) IBOutlet UIBarButtonItem *barButton;
- (void) barButtonPress;
Notice that I added a function that will handle the bar button press. Now you need to link this Outlet to the bar button item, simply in Xcode in the Connection Inspector where it says New Referencing Outlet drag to the File's Owner box (the yellow cube).
Now in the viewDidLoad add the following:
[barButton setTarget:self];
[barButton setAction:#selector(barButtonPress)];
This code will link your bar button to the function that you want to be called when you press it. Now for the view that you like to view Modal, I assume that you already #import it also in the .h file, lets call it MyViewModal.
Inside the function that will be called when you press the bar button:
- (void) barButtonPress
{
MyViewModal *myViewModal = [[MyViewModal alloc] initWithNibName:#"MyViewModal" bundle:nil];
[self presentModalViewController:myViewModal animated:YES];
}
That's all, it will be displayed in Modal View. Keep in mind the allocating the new view is done based on your needs, here I did the simplest case just for illustration.
UPDATE: If not using Xcode
If you are not using Xcode then you should have a toolbar already defined say it is named myToolBar. To add buttoms to the tool bar we use the myToolbar.items way therefore we need to prepare the buttons with their targets before adding them. Here is a workflow:
UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
[infoButton addTarget:self action:#selector(barButtonPress) forControlEvents:UIControlEventAllEvents]; //same function as above
UIBarButtonItem *btn = [[[UIBarButtonItem alloc] initWithCustomView:infoButton] autorelease];
myTool.items = [NSArray arrayWithObjects:btn, nil];
This should do it for you.