I have a UINavigationController as one of the views inside a tab bar control. It looks fine, and I have a UIBarButtonItem that is supposed to load a subview. I have the button wired up to an IBAction that calls pushViewController but when I do this nothing happens. It doesn't crash or anything.. it just doesn't do anything. I've tried: using different view controllers as the subview (no luck). Does anybody have any suggestions? Here is my code:
Header file:
#import <UIKit/UIKit.h>
#import "FSSettings.h"
#import "MeasureSelector.h"
#import "Dashboard.h"
#interface DashboardNavigationController : UIViewController {
IBOutlet UINavigationController *navController;
IBOutlet UINavigationBar *navBar;
IBOutlet UIBarButtonItem *measureButton;
}
#property (nonatomic, retain) IBOutlet UINavigationController *navController;
#property (nonatomic, retain) IBOutlet UINavigationBar *navBar;
#property (nonatomic, retain) IBOutlet UIBarButtonItem *measureButton;
- (IBAction) showMeasureScreen:(id)sender;
#end
And the .m file containing the action:
// Displays the measure screen
- (IBAction) showMeasureScreen:(id)sender
{
NSLog(#"Loaded measure screen");
MeasureSelector *msel = [[MeasureSelector alloc] initWithNibName:#"MeasureSelector" bundle:nil];
[[self navigationController] pushViewController:msel animated:YES];
NSLog(#"Done.");
}
When I click the button nothing happens (but I do see the log messages). I can do this over and over with no ill effects, however.
The navigationController property of UIViewController refers to the nav controller of which the UIViewController is part of the hierarchy. If I understand the scenario correctly, DashboardNavigationController manages the view that is the container for the UINavigationController, so it makes sense that this property would be nil.
Use the outlet you created to access the nav controller from outside of the nav controller's hierarchy.
Related
I have a Navigation Controller with two Views. The First View is a ViewController with a TableView and the Second View is UIView with some UILabels and a UIWebView. When selecting a cell from the TableView, the Navigation Controller pushes to the Second View.
I've added a UIToolBar to Navigation Controller and some buttons.
My problem is when the Navigation Controller pushes to the Second View (UIView), my UIToolBar appears but without the buttons.
I would like to either show different buttons or remove the UIToolBar from the Second View.
I think I need to do something within the AppDelegate, I'm just not sure what and how.
Here is how my XIBS look:
MainWindow
- App Delegate
- Window
- Navigation Controller
-- Navigation Bar
-- ToolBar
-- View Controller
--- Bar Button Item
--- Navigation Item
---- Bar Back Item
ViewController
-TableView
DetailView
-View
--Web View
--Label
--Label
Code:
AppDelgate.h
#interface AppDelegate : UIResponder <UIApplicationDelegate>
{
UIWindow *window;
UINavigationController *navigationController;
UIToolbar *toolBar;
}
#property (nonatomic, strong) IBOutlet UIWindow *window;
#property (nonatomic, strong) IBOutlet UINavigationController *navigationController;
#property (nonatomic, strong) IBOutlet UIToolbar *toolBar;
#end
AppDelegate.m
#implementation AppDelegate
#synthesize window;
#synthesize navigationController;
#synthesize toolBar;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after app launch
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
}
- (void)applicationWillTerminate:(UIApplication *)application {
// Save data if appropriate
}
#end
Any help would be appreciated. Thanks
You have to specify the toolBarItems for each View you load onto the stack. So,
-(void)viewDidLoad{
[self setToolbarItems:myArrayOfItems];
//do this in every view controller
//other code.
}
I cant get you clearly. i suggest this with the assumption. If you want add button in the top bar of the nextview means, you dont use toolbar for that. You can add button in the navigation bar itself.
you can add the button using addsubview method.
Initialize UIbutton using initwithframe. then add that as a subview of navigation controller.
[navigationcont addsubview:button];
Im new to iphone development and after lots of reading on it im still trying to figure out how UIViews operate properly. I have been playing about with it and i this is where i am at so far:
I have created a new xcode project using the view-based application. I have my MMAppViewController classes and i created a new UIViewController subclass called "Level1View".
There is a button titled "Level 1" that takes me to the "Level1View" viewController. In this viewController there is there is a "next" button, a "main menu" button (that returns to MMAppViewController) and there is a label, currently titled "Level 1".
My problem is that the code i have used to change the title of label does not work! Does anyone know why this is? Here is my code:
#class MMAppViewController;
#interface MMAppAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
MMAppViewController *viewController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet MMAppViewController *viewController;
#end
and
#implementation MMAppViewController
-(IBAction)pushLevel1{
Level1View *level1View = [[Level1View alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:level1View animated:YES];
}
...
and
#import <UIKit/UIKit.h>
#interface Level1View : UIViewController {
IBOutlet UILabel *labelTitle;
}
-(IBAction)pushBack;
-(IBAction)pushNext;
#end
and
#import "Level1View.h"
#import "MMAppViewController.h"
#implementation Level1View
-(IBAction)pushBack{
MMAppViewController *MainView = [[MMAppViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:MainView animated:YES];
}
-(IBAction)pushNext{
[labelTitle setText:(#"Thanks for playing :)")];
}
- (void)didReceiveMemoryWarning {
...
Currently the app runs but the label wont change when i hit the "next" button. Can anyone help?
are you sure a UINavigationController isn't a better tool for the job you want to do? That will make it easy for you to manage a stack of UIView objects.
That said, have you tried adding logging to make sure your pushNext method is getting called? where is labelTitle declared? Did you use a XIB or not?
Did you bind the Label in Interface Builder to the labelTitle outlet in your Level1View?
If you forget that step, the outlets won't work. Even after several years, I still forget this step sometimes.
--Mike
are you sure you connected the label in IB?
and if you set a property "#property (nonatomic, retain) IBOutlet UILabel *labelTitle;" in Level1View.h you can access it from Main View:
Level1View *level1View = [[Level1View alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:level1View animated:YES];
level1View.labelTitle.text = #"something";
[level1View release];
The other thing you shouldn't present the Main View Controller again instead dismiss the Level1View with:
#implementation Level1View
-(IBAction)pushBack{
[self dismissModalViewControllerAnimated:YES];
}
//
and maybe the problem is [[Level1View alloc] initWithNibName:nil bundle:nil] you have to specify the nib you want to load e.g. [[Level1View alloc] initWithNibName:#"Level1View" bundle:nil]
Declare labelTitle as a property in your header file, and synthesize labelTitle in your .m - as long as labelTitle is hooked up through interface builder the rest of your code is fine.
.h
#property (nonatomic, retain) IBOutlet UILabel *labelTitle;
.m
#synthesize labelTitle;
Then your setter call will work. (also, dot-notation works for synthesized properties so you may as well use it)
change
[labelTitle setText:(#"Thanks for playing :)")];
to
labelTitle.text = #"Thanks for playing :)";
Synthesizing a property will create setter and getter methods at runtime. Read: The Objective-C Programming Language
I'm creating an app with one UIViewController and many UIViews. I have MainViewController with a UIView underneath it that displays when loaded up and a few other UIViews all in the MainWindow.xib. How do I go about switching from one View to the next?
Update:
Thanks for the reply.
I have added MainViewController to my appDelegate.
On FinishedLaunching: [window addSubview:[viewController view]];
That View Controller has a function in it called goToNextPage.
-(IBAction)goToNextPage:(id)sender{
[self.view removeFromSuperview];
[self.view addSubview:tableOfContents];
}
In Interface Builder I have that View Controller added to MainWindow.xib. Under that View Controller I have a UIView (called Cover) that loads as it's child on startup and another UIView (eventually many) named TableOfContents that is on its own.
I tried to post an image of my MainWindow.xib here but apparently my Reputation isn't high enough.
The UIView Cover has a button on it that is linked to the goToNextPage function.
When I hit the button the page goes blank as if the one view is successfully being removed but the next is not being loaded.
How do I get the goToNextPage function to switch the preloaded UIView Cover with the other UIView called TableOfContents?
Another Edit:
BookTest6AppDelegate.h:
#import <UIKit/UIKit.h>
#class MainViewController;
#interface BookTest6AppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
IBOutlet MainViewController *viewController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet MainViewController *viewController;
#end
BookTest6AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
[window addSubview:[viewController view]];
[window makeKeyAndVisible];
return YES;
}
MainViewController.h
#import <UIKit/UIKit.h>
#class TableOfContents;
#interface MainViewController : UIViewController {
IBOutlet TableOfContents *tableOfContents;
}
#property (nonatomic, retain) IBOutlet TableOfContents *tableOfContents;
-(IBAction)fGoToTableOfContentsController:(id)sender;
-(IBAction)fGoToNextPageController:(id)sender;
#end
MainViewController.m
#import "MainViewController.h"
#import "TableOfContents.h"
#implementation MainViewController
#synthesize tableOfContents;
-(IBAction)fGoToTableOfContentsController:(id)sender{
[self.view removeFromSuperview];
[self.view addSubview:self.tableOfContents];
}
-(IBAction)fGoToNextPageController:(id)sender{
}
My UIView Classes basically just initiate buttons that link to the functions defined in MainViewController.h.
First you need to know when switching from one to another.
Then you say it to your MainController and addSubView to the mainController.view an another view.
Maybe if you give us more informations or code we could help you a little more :-)
Good Luck
Vincent
Edit :
[self.view removeFromSuperview];
Here you are removing the window view. I think it's not the better way ^^ Try
[ viewController.view removeFromSuperview ]; :-)
Does it work better ?
Edit :
Edit bis : han, it's my fault. You need to remove controller and add another one in the app delegate and not in your mainController (you could do it too, but no with your actual code).
You have two options :
1°) Declare all your controllers in your app delegate.
2°) Declare all your controllers in one main controller. But the main controller would be here to "control" others one.
Some one please help me with this. I am developing an iPhone app and have stared with View Based Application. I have buttons on my root view screen to take user to other views with their own nibs and classes. On one of those views I need to display a table getting data from SQLite database and then display detail of the selected item depending on the selection from the table. At later stage I also need to add forms to add data.
Now, how to add a Navigation Controller in that view for drill down? Can we convert a View Controller to Navigation Controller just by adding a Navigation bar at the top?
sure
in viewbase application, u can create navigation controller
add the code in delegate.h
#interface test24AppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
test24ViewController *viewController;
UINavigationController *nav;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet test24ViewController *viewController;
#property (nonatomic, retain) IBOutlet UINavigationController *nav;
#end
add this delegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
nav=[[UINavigationController alloc]init];
[nav pushViewController:viewController animated:YES];
[self.window addSubview:nav.view];
[self.window makeKeyAndVisible];
return YES;
}
now it will work, u check using nslog(#"%#", self.navigationController); if the result is null then u have problem still.
I'm a beginner programmmer, this is for xcode - iPhone. although i made alot of my iPhone app but i seem to lack some understanding of how a simple communication might work.
Specially when I've got 2 ViewControllers.
And I wana call one function of a ViewController from another ViewController. Both are under a tabbarController. What I want to achieve is When I'm in ViewA, after tapping on a tableCell, I Should Invoke a method of ViewB and the NavigationBar of ViewB pushes to viewDetail.
The Following is the code i'm using
in ViewControllerA.h (where I'm calling a method)
#class ViewControllerB;
#interface SmartDDxViewController : UIViewController {
IBOutlet UITableView *tableView;
ViewControllerB *xViewController;
}
#property (nonatomic, retain) UITableView *tableView;
#property (nonatomic, retain) ViewControllerB *xViewController;
And this is what I use to invoke it..ViewControllerA.m
ViewControllerB *ddViewController = [[ViewControllerB alloc] init];
self.xViewController = ddViewController;
[xViewController InitialiseDetailWithId:2 title:#"HEYA"];
Heres the InitialiseDetailWithId code: in ViewControllerB.m
-(void)InitialiseDetailWithId:(NSInteger)pkey title:(NSString *)tt{
NSLog(#"InitialiseDetailC=========================================");
AppDelegate *appDelegate = (Smart_DifferentialsAppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegate GetConditionDetailsWithId:pkey];
DDisViewController *viewController= [[DDisViewController alloc] initWithNibName:#"DetailView" bundle:nil];
viewController.title = tt;
[self.NavBar pushViewController:viewController animated:YES];
//[tt release];
[viewController release];
viewController = nil;
[self say:#"HEYA"]; //this is ALERTVIEW box that displays HEYA
}
I'm getting all information fine, and the alertview does get displayed. But when I chose that View in TabBar, its not pushed.
Do not use direct access between view controllers, instead use the delegate pattern. Define your controller like this:
#protocol ViewControllerAInitDelegate;
#interface ViewControllerA : UIViewController {
IBOutlet UITableView *tableView;
id<ViewControllerAInitDelegate> initDelegate;
}
#property (nonatomic, retain) UITableView *tableView;
#property (nonatomic, assign) ViewControllerAInitDelegate *initDelegate;
#end
#protocol ViewControllerInitDelegate
-(void)initializeDetailWithId:(NSInteger)pkey title:(NSString)tt;
#end
So in
Now let your application delegate conform to the ViewControllerInitDelegate protocol. It should look something like this:
#interface AppDelegate : NSObject <UIApplicationDelegate, ViewControllerInitDelegate> {
IBOutlet UITabBarControler* tabBarController;
IBOutlet ViewControllerA* controllerA;
IBOutlet ViewControllerB* controllerB;
}
#end;
The AppDelegate should know about both ViewControllerA, and ViewControllerB, but neither of the view controller should know about each other. This way it will be much easier to debug and extend your app.
//current view controller index
int currentVCIndex = [self.navigationController.viewControllers indexOfObject:self.navigationController.topViewController];
//previous view controller (index -1)
AccountViewController *account = (AccountViewController *)[self.navigationController.viewControllers objectAtIndex:currentVCIndex - 1];
(access to anything you want)
account.property = object;
[account doSmthng];
In each of your view controllers, you might want to add a instance variable/property to keep track of the other view controller.
you might have for example:
#interface ThisViewController : UIViewController {
SomeViewController *sViewController;
// other instance variables
}
#property (nonatomic, retain) SomeViewController *sViewController;
This not only makes it easier to call methods from the other view controller and access its public properties, but it also allows you an easier way of flipping between the two (with or without animation).