when we do like this
self.navigationController.toolBarHidden = NO;
question : where does navigationController come from. I take a look at UIViewController.h but I can not find that property at all
Please advice me on this. Thanks
Look at the UINavigationControllerItem category on UIViewController (in UINavigationControler.h):
#interface UIViewController (UINavigationControllerItem)
#property(nonatomic,readonly,retain) UINavigationItem *navigationItem; // Created on-demand so that a view controller may customize its navigation appearance.
#property(nonatomic) BOOL hidesBottomBarWhenPushed; // If YES, then when this view controller is pushed into a controller hierarchy with a bottom bar (like a tab bar), the bottom bar will slide out. Default is NO.
#property(nonatomic,readonly,retain) UINavigationController *navigationController; // If this view controller has been pushed onto a navigation controller, return it.
#end
Related
I created my iOS app with Tab Bar template, so here is UITabBarController with bar buttons. An issue is how to set it as delegate. I found at SO that it has to be set programmatically in AppDelegate, but I believe it's impossible, because I've got no access to Tab Bar Controller as outlet.
I added proper value to #interface (both ViewController and AppDelegate), but doesn't know what to do next.
#interface ViewController : UIViewController <UITabBarControllerDelegate>
I hope I don't have to get rid of whole app template and it's possible to set Tab Bar Controller created in IB to be delegate.
Exactly I want to make it delegate to create on tab select event like this:
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController;
Any idea?
You can quickly and easily create a new TabBarController Delegate class and connect it as the delegate in the storyboard.
Create a new class :
class TabBarControllerDelegate: NSObject, UITabBarControllerDelegate {
In IB, add an object from the object library to the list of View Controller on the left (note: search "object", it's a yellow cube).
Change the class of this object (your yellow cube in IB) to TabBarControllerDelegate
In IB navigate to your Tab Bar Controller Scene. From the Connection Inspector, drag the delegate circle to the new object you added in Step 3.
Implement your delegate methods in your TabBarControllerDelegate class. Done!
func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController)->Bool {
println("Selected a new tab")
}
I don't remember exactly the Xcode's Tab Bar template set up, but in your AppDelegate you can access to your window's rootViewController, cast it to a UITabBarController, and then set its delegate to your AppDelegate or to any other view controller.
Something like this:
UITabBarController *tabBarController =
(UITabBarController *)[[self window] rootViewController];
[tabBarController setDelegate:self]; // In this example your app delegate would implement the UITabBarControllerDelegate protocol.
EDIT
If you want to set your ViewController instance as the delegate:
UITabBarController *tabBarController =
(UITabBarController *)[[self window] rootViewController];
// I assume you have your ViewController instance set as the first view controller of your tab bar controller
// No need for a cast here since objectAtIndex: returns id, but of course you must implement the UITabBarController protocol in your ViewController.
[tabBarController setDelegate:[[tabBarController viewControllers] objectAtIndex:0]]];
EDIT 2
From your ViewController itself you can set the tab bar controller's delegate as rdelmar comments.
Just keep in mind that this cannot be done in the init method because the view controller is not in the tab bar controller yet. The proper place would be viewDidLoad but therefore it will not be executed until the ViewController view loads...
self.tabBarController.delegate = self;
0 lines of code
Drag an Object and subclass it
Xcode > Show File Inspector > Custom Class.
Class: TabBarControllerDelegate.
Set delegate to that Object
Put your existing code in that Object
This is the code you already have in your current UITabBarControllerDelegate.
class TabBarControllerDelegate: NSObject, UITabBarControllerDelegate {
// Delegate code goes here
}
What about create a viewController lets say MyTabController subclass UITabBarController
#interface MyTabController : UITabBarController<UITabBarControllerDelegate>
and set the tab Controller's class in you storyboard to MyTabController instead of UITabBarController, then put self.delegate = self; in your viewDidLoad
implement:
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController;
and here you are.
Edit:
If you find self.delegate = self; is odd, which it is, you can create an outlet in your MyTabController
IBOutlet UITabBarController *tabBarController; and connect it to the tab controller in your storyboard.
Then you can put tabBarController.delegate = self;
My app currently has a UINavigationController and I'd like to push a UITabBarController at some point when a button is clicked. I am trying to create it on Interface Builder (as opposed to programatically).
All online tutorials show how to create a tab bar based app, which involves dragging a UITabBarController into the MainWindow.xib which is obviously not what I want.
What I did was create a UIViewController, and its nib file, dragged a UITabBarController. Now pushing that UIViewController to the navigation controller will show an empty view (its empty view). Removing the view in the view controller will crash the app. How can I tell the UIViewController to load a UITabBarController instead of its own view?
For those down-voting me: it would be decent to at least provide a comment. The question is not a poor question. The questions is asking for suggestions for how to use a UITabBarController in an unorthodox way. I tried most of the suggestions and they do not work. If you are down-voting, at least write a comment.
You can see this this may help you
Since this is how you want your app to be: - Navigation Controller - Root View Controller - Other View Controllers - Tab Bar Controller - First VC under tab - Second VC under tab - Third VC under tab - more view controllers
in your view controller where you want to pushViewController to UITabBarController use this
//create a UITabBarController object
UITabBarController *tabBarController=[[UITabBarController alloc]init];
//FirstViewController and SecondViewController are the view controllers you want on your UITabBarController (Number of view controllers can be according to your need)
FirstViewController *firstViewController=[[FirstViewController alloc]initWithNibName:#"FirstViewController" bundle:nil];
SecondViewController *secondViewController=[[SecondViewController alloc]initWithNibName:#"SecondViewController" bundle:nil];
//adding view controllers to your tabBarController bundling them in an array
tabBarController.viewControllers=[NSArray arrayWithObjects:firstViewController,secondViewController, nil];
//navigating to the UITabBarController that you created
[self.navigationController pushViewController:tabBarController animated:YES];
This tutorial might help. It comes with an example code.
Hi just make both nav controller and tabBar Controller in app delegate.
Initially add navController to your root view..
[self.window addSubview:navigationController.view];
and whenever you want to add tab bar then remove navController and add tabBarController.
-(void)addTabBarController
{
AppDelegate *appdelegte =(AppDelegate*)[[UIApplication sharedApplication]delegate];
[[[appdelegte navigationController] view]removeFromSuperview];
[[appdelegte window]addSubview:[[appdelegte tabcontroller]view]];
[[appdelegte tabcontroller]setSelectedIndex:0];
}
If you get any problem then ask me again..
In YourView controller make IBOutlet of tabBarController
in .h file
#import <UIKit/UIKit.h>
#interface YourView : UIViewController
{
IBOutlet UITabBarController *tabBarController;
}
-(IBAction)loadTabBar:(id)sender;
#end
and in .m file
#import "YourView.h"
#import "FirstViewController.h"
#import "SecondViewController.h"
#implementation YourView
-(IBAction)loadTabBar:(id)sender
{
FirstViewController *firstView = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
SecondViewController *secondView = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
tabBarController = [[UITabBarController alloc] init];
tabBarController.viewControllers = [NSArray arrayWithObjects:firstView, secondView, nil];
[self.navigationController pushViewController:tabBarController animated:YES];
}
#end
The tabBarController IBOutlet must be connected to the UITabBarController that on the .xib file. And that UITabBarController with two view controllers named FirstViewController, SecondViewController.
I remember doing something similar to this...
I had to create a custom UITableViewController to do this, if you are going to use UINavigationController to 'push' to it.
Doing it only in interface builder may be a bit tricky, it's been a while since I've been at it, I do recall it was a bit of a nightmare to get going correctly.
The problem was, as I believe I've mentioned somewhere, is that the XIB does not have a UIView connected to it. When the UIView is deleted in a XIB file and a UITabBarController is added, the view property of the XIB has to be connected to the UITabBarController's view. I connected it and it worked. That was the reason why I was getting a SIGTRAP.
take a uiview of tab bar controller means create an interface builder with tabs and add that tab bar uivew in your classes where ever u wanted the tab bar
for example take a tab bar uiview of 3 tabs in that uiview take the three buttons in the interface builder
for every navigation of that classu should add this uiview class
-(IBAction)firt_button_pressed:(id)sender
{
}
-(IBAction)second_button_pressed:(id)sender
{
}
I want to create a modal view with the navigation item (right view on my screenshot) and I want it to have a 'back button'. My app is TabBar application and I don't want this view to have a tab bar, but I want to load a previous view (left view on my screenshot) with a segue similar to the type "push".
I can only create push segue to provide right navigation back to the view on the left, if it's loaded as a modal view, the NavigationBar & TabBar are gone. Any workarounds for this?
Thanks in advance!
Just put a Navbar on the new view with a bar button item. Create an action for the bar button item by control dragging from the bar button item to the .h of the view controller. You can then use a delegate and protocol method to tell the first controller when the button has been pressed and have it use [self dismissModalViewControllerAnimated:YES];
So in your second view create a protocol with a method done, like this:
#protocol SecondViewControllerDelegate <NSObject>
-(void) done;
#end
#interface SecondViewController : UIViewController {
...
id delegate;
}
...
#property (nonatomic, assign) id<SecondViewControllerDelegate> delegate;
-(IBAction)done:(id)sender; //this will be linked to your nav bar button.
#end
then in your action from your button call this:
-(IBAction)done:(id)sender{
[self.delegate done];
}
Your first view controller will need to implement the protocol <SecondViewControllerDelegate>
then in your first view controller, set it up as a delegate for your second view controller before you segue.
-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([[segue identifier] isEqualToString:#"Second View Modal Segue Identifier"])
{
SecondViewController *viewController = segue.destinationViewController;
viewController.delegate = self;
}
}
lastly, catch the done call from the delegate in your first view controller:
-(void) done
{
[self dismissModalViewControllerAnimated:YES];
}
That's how I have done it. If you don't have a lot of experience with protocols and delegates it may seem confusing at first, but it has worked well for me.
You will need to wrap your right hand side view controller in a new navigation controller. In IB, select it and choose the menu item Editor -> Embed In -> Navigation Controller and IB will show a nav bar which you can customize to your heart's content.
How can I present a modal view controller from the app delegate's view, the top most? Trying to present a modal view controller from a UIView, which made me confused.
Use your rootViewController. You can present a modal view controller from any view controller subclass. If your root VC is a UITabBarController, then you can do:
[self.tabBarController presentModalViewControllerAnimated:YES]
or if its a navigation controller:
[self.navigationController presentModalViewControllerAnimated:YES]
etc.
EDIT: MVC
By trying to present a controller from within a view you are breaking the MVC pattern. Generally, a view is concerned with its appearance and exposing interfaces to communicate user interface state to its controller. For example, if you have a UIButton in your view and you want it to present a modal view controller, you don't hard wire the view to do this. Instead, when a controller instantiates the view, the controller configures the button by setting itself as a target to receive the touchUpInside action where it can present the appropriate modal view controller.
The view itself does not (and should not) have this contextual knowledge to do the work of a controller.
The best way to do this is to create a new UIWindow, set it's windowLevel property, and present your UIViewController in that window.
This is how UIAlertViews work.
Interface
#interface MyAppDelegate : NSObject <UIApplicationDelegate>
#property (nonatomic, strong) UIWindow * alertWindow;
...
- (void)presentCustomAlert;
#end
Implementation:
#implementation MyAppDelegate
#synthesize alertWindow = _alertWindow;
...
- (void)presentCustomAlert
{
if (self.alertWindow == nil)
{
CGRect screenBounds = [[UIScreen mainScreen] bounds];
UIWindow * alertWindow = [[UIWindow alloc] initWithFrame:screenBounds];
alertWindow.windowLevel = UIWindowLevelAlert;
}
SomeViewController * myAlert = [[SomeViewController alloc] init];
alertWindow.rootViewController = myAlert;
[alertWindow makeKeyAndVisible];
}
#end
Application delegates do not manage a view. You should present a modal view controller from the -viewDidAppear: method of the first view controller that gets put on screen in -application:didFinishLaunchingWithOptions:.
I have been attempting to present a modal view from one of my views that I implemented following the following iDev tutorial/source code. The custom tab bar manages view by inserting them as subviews beneath the tabBar so when I call the modal view to be displayed from the subview it is covered up at the bottom by the tab bar. I have switched the following code to above the tab bar sub view which allows the whole screen to be displayed but it still creates animation problems.
// Set the view controller's frame to account for the tab bar
viewController.view.frame = CGRectMake(0,0,self.view.bounds.size.width, self.view.bounds.size.height-(tabBarGradient.size.height));
// Set the tag so we can find it later
viewController.view.tag = SELECTED_VIEW_CONTROLLER_TAG;
// Add the new view controller's view
[self.view insertSubview:viewController.view aboveSubview:tabBar];
http://idevrecipes.com/2011/01/04/how-does-the-twitter-iphone-app-implement-a-custom-tab-bar/
Please help this is driving me nuts!
So, i think you are presenting modal view from your subview like this:
[self presentModalViewController:someController animated:YES];
If so, your controller is presenting on current view (self) and if current view situated beneath other views - modal controller will be presented under them too.
You should get a reference to main parent view, so you could call presentModalViewController there.
In big projects with many subviews it's handy to have a reference to main view, I did it like this:
in MyAppDelegate #interface I have:
{
UINavigationController *navController;
}
+ (UINavigationController *) navController;
#property (nonatomic, retain) IBOutlet UINavigationController *navController;
And in the implementation:
// Used for showing modal windows over tabbar
static UINavigationController * _rootController = nil;
+ (UINavigationController *) navController {
return _rootController;
}
#synthesize navController;
in didFinishLaunchingWithOptions:
_rootController = navController;
(In this example my top view - navigation controller)
So anywhere in application I can call:
[[MyAppDelegate navController] presentModalViewController:someController animated:YES];