This may be a silly question, but how would I go about changing the 'back' button of the navigation controller to simply say 'Back' every time I push to a different ViewController?
For example, if I'm going from the Master to the Detail then it will have: "< Master" as the back button text. Can I change it easily to "< Back" without messing around too much? (It's just I have quite a few segues going and if I have to replace the button manually I'm probably going to screw up something else...)
All help is appreciated. Thanks :)
You need to assign a backBarButtonItem to the current navigation item before pushing another. Navigation items are pushed when view controllers are pushed.
So something like this:
self.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(#"Back", #"") style:UIBarButtonItemStylePlain target:nil action:NULL];
[self.navigationController pushViewController:next];
The target and action of the bar button item are not required, as only the title is used.
You can set backBarButtonItem once in viewDidLoad of your view controller.
It automatically grabs the title of the previous view controller as long as the title is short enough to fit into the button. To override this behavior, you can provide your own UIBarButtonItem for the backBarButtonItem property. (Just create a basic push button and it should work IIRC.)
Related
I have an app I am working on that has a main screen with two buttons. One will take you to a view of a GPS (map) and then once there (new VC) it has options for setting that position or bringing up a list (tableview, another VC) of all locations already tagged.
At the list VC, if you click on the table cell, it will bring up the VC with the map. Problem is, this then adds the same VC bak on the stack. If a user clicks the Cancel button, they go back ones screen, then cancel goes back another screen, etc... until back to the main.
I know I can do the [self.navigationController popToRootViewControllerAnimated:YES]; to pop back to root but that is not always what I want.
Also, I know I can do: [[[self presentingViewController] presentingViewController] dismissModalViewControllerAnimated:YES];
I guess what I am saying is I want to "reuse" the GPS map view so I can call it from other VC's, so that is why I didn't go with the "pass back" to calling VC. So, is there away to either when a button is pressed and is to present a new VC, can I dismiss the prior one after the new one is shown? This way, a dismiss of current VC would take me back to where I need to be.
I hope makes sense and also that this question doesn't fall into the "Not an actual question" category.
Any help or better suggestions is greatly appreciated. Thx
Geo...
If you want to jump back some number of levels in a navigation controller's VC stack, you'll probably want to use its popToViewController:animated: method. To figure out if a particular view controller is on that stack, look at the navigation controller's viewControllers property. Be careful, though, as this kind of jumping around is a rather nonstandard UI behavior (even though there's API for it) which might confuse your users.
Also, using navigation controllers and presenting modally aren't the only ways to manage multiple view controllers -- you can always set the window's rootViewController yourself (and animate the change with UIView animations), even wrapping up your custom transition type in a custom UIStoryboardSegue if you like.
You can put a delegate in the table view. So that when a cell is pressed the info is passed to the delegate method in the VC which will dismiss the table view and reloads itself with the new info. You will have to implement refresh method in that VC.
Hi there and thank you in advice for your help. I have a really strange problem while working with ViewControllers in Xcode4. First of all I have to say that I'm not using storyboards and I prefer to create any UI element programmatically. So I've set a UIButton and I want that, when pressed, it brings me to a new view controller. This is the code I'm using for a button:
-(void)settingsAndExportHandle:(UIButton *)buttonSender {
SettingsViewController* settingView = [[SettingsViewController alloc] initWithNibName:#"SettingsViewController" bundle:nil];
settingView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:settingView animated:YES];
}
This buttons is initialized and allocated in the viewDidLoad method of the RootViewController. I want to switch to the other view controller (in this case SettingsViewController) when I press the button.
The strange thing is that when I press the button, the animation that flips the controllers goes well, but when it finishes I obtain the EXACT same things that I had on the RootViewControllers (same custom views, same buttons, same all!). The question is: what I'm missing?? I have to say that I use ARC (automatic reference counting) so I can't release or dealloc the views and buttons I've created on my RootViewController.
Any help will be appreciated. Thank you all!
Pushing and and modally presenting view controllers does not deallocate the view controller that presented them. It simply adds the additional view controller to the stack. You'll need to implement a callback method so that when the user hits the button to flip back to root view controller, your settings view controller lets the root view controller know what's about to happen so you can call a method you've written to reset the interface back to whatever state you need it at. You may also be able to use viewWillAppear: but that's a little messy.
However, according to the Apple Human Interface Guidelines, the user expects that when they push a view controller or modally present it, the view controller they were on will save state and be exactly the way they left it when they came back. It's disconcerting and annoying when state is not preserved while in a navigation controller context. It is especially annoying when it's modally presented.
Think about this - A user is in a hypothetical Mail app. They start typing out an email and set a font size and a color. They tap on the add attachment button, which brings up a modal view controller that allows them to select a picture. They select the picture and the modal view is dismissed, and in your implementation, the mail composing interface would have reset and the email content would be gone or at the very least the selected font size and color would be back to the default. That's not a good experience.
I have a toolBar and I have setup two UIBarButtonItem on it. Both UIBarButtonItem are containing UIButtons as their customViews.
I activate a popover for their Touch Up Inside event as below,
[popover1 presentPopoverFromBarButtonItem:buttonItem1 permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
I have another UIButton named clearFilters inside the main view. (Also this is the view which is containing the above toolBar.) I have declared a method for clearFilters button's Touch Up Inside event.
My problem is,
I can not interact with the clearFilters button while a popover is active. So, I'm looking for a solution to interact with this clearFilters button, while a popover is active.
I tried by adding passthroughViews property for a popover as below and it do not work as I expect.
popover1.passthroughViews = [NSArray arrayWithObject:clearFiltersButton];
What could be the reason. As the documentation has mentioned I can not see any issue.
I expect if the above things are correct, then the Touch Up Inside event of the the clearFilters button's should be fire up.
So, please show me if there is any issue or a necessary way to work on this thing.
I'm working on XCode4 and iOS 4.3.
Thanks.
The UIPopoverController documentation reveals why the other bar buttons can be tapped while the popover is visible:
“When presenting the popover, this method adds the toolbar that owns the button to the popover’s list of passthrough views.”
Try querying and logging the popover’s passthrough views. Does it already have things in it? Perhaps something like this would work?
myPopover.passthroughViews = [myPopover.passthroughViews arrayByAddingObject:clearFilters];
I haven’t tested this code, but it’s worth a try.
I have a UINavigationController, complete with table view and associated magic.
The data I'm populating that table view from may have items from multiple categories, but the default view for the user will be one in which they are viewing all of the items, and then they have the ability to move backwards to a different table view that would allow them to select a different category, which would then return to the original table view with the appropriate data populated.
What's the proper approach for this? I can't seem to wrap my head around how I would make the navigation controller give me a back button (with appropriately wired up actions) without having come from a previous view in the stack (which wouldn't really exist at launch time if I start the user off from what is essentially the detail view, in stack terms.)
Also, the back button should be titled "Groups", not "Back", but that's really just an implementation detail. :)
Update: This issue finally manifested itself in production code, and here’s how I fixed it:
My UINavigationController is created in a nib, with the root view set as the “groups” view. Then, in my app delegate, I push the second view onto the stack while the app is launching.
That works fine for achieving the proper stack, but that doesn’t help with the back button title, because the navigation controller didn’t seem to want to grab the title from the root view, and instead was showing a back button with “Item” as the title.
So, on the pushed view, in viewDidLoad, I set:
self.navigationController.navigationBar.backItem.title = #"Groups";
and that did the trick.
The only potential downside of doing it this way would be if the pushed view controller were ever used in a scenario where the view below it wasn’t the groups view, but since the design of this particular application ensures that never happens, I’m accepting that failure. ;)
Another update:
I’m an idiot. Just set the title property of the navigationItem provided by the navigationController in Interface Builder, and boom, no issue. Or do it in code. It doesn’t matter, just don’t do it by setting the backItem.title way I show you above. That’s just dumb.
In your application delegate's .m file in the application:didFinishLaunchingWithOptions: method just push your view controllers like you normally would with[self.navigationController pushViewController:your_view_controller animated:YES]; and it should push them on before the application's first view controller appears.
To change the text of the button to Groups just call this before pushing your controllers.:
UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle: #"Groups" style: UIBarButtonItemStyleBordered target: nil action: nil];
[[self navigationItem] setBackBarButtonItem: newBackButton];
[newBackButton release];
I am working on an app in which the starting point is a map and it has a button too. What i want is that if user clicks the button it will take him to another view which just have two or three buttons or other elements.
Please provide me with detail answer so that i would be able to do it.
Thanks in advance, i would really appreciate it.
just put this code inside your button action and change it your needs
YourViewControler *yourViewControler = [[YourViewControler alloc] initWithNibName :#"YourViewControler" bundle:nil];
[self.navigationController pushViewController:yourViewControler animated:NO];
[yourViewControler release];
and you can add anything in YourViewControler.
I hope it will help you.
That could be achieved in a lot of ways. For example you could use a controller for each view you need and switch between them with the use of a UINavigationController. Use the map controller as the root of the navigation controller, then when the user presses the button just call pushViewController:animated: