Custom back button for NavigationController for every screen

问题

I have been trying to subclass the UINavigationController class for modifying things like background image, navigation bar size, back button, tittle font and so on. After a couple of hours and a lot of reading I have understand that I should not subclass the UINavigationController class...

I would like to have specific design and transfer that design to all screens that use my custom NavigationController...

SO far I haven't fount any elegant solution for this, most of the solutions are based on configuring something for showing in the next screen only (next view).

How can I achieve this? Maybe using categories? Thanks in advance.

回答1:

I am showing code for custom leftbarbutton of UINavigationcontroller. You can add this code in each view controller and for both button( right and left)

    leftButton = [UIButton buttonWithType:UIButtonTypeCustom];    
    [leftButton setImage:[UIImage imageNamed:@"Yourcutomeimage.png"] forState:UIControlStateNormal];    
    leftButton.frame = CGRectMake(0, 0, 30, 30);
    [leftButton addTarget:self action:@selector(youraction:) forControlEvents:UIControlEventTouchUpInside];  

    self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:leftButton]autorelease];

//or

self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:leftButton]autorelease];

Hope, this will help you..

回答2:

Yes @Nit is right, this is the way to customize the UINavigationController, but if you don't want to do it for every UIViewController you have, you can create a UIViewControllerBase class, which is a subclass of UIViewController and in viewDidLoad method, set all your buttons the way @Nit has described and then make every UIViewController you have to be a subclass of your UIViewControllerBase class.

回答3:

If you want to add a custom back button to uinavigationcontroller you should use navigationItem.backBarButtonItem and implement it in the class where you initialize the uinavigationcontroller. Sample :-

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"btnImage.png" style:UIBarButtonItemStyleBordered target:youtarget action:@sel(your action)];  
self.navigationItem.backBarButtonItem = backButton; [backButton release];