I have a MyAppAppDelegate, it contains a window, and a UITabBarController.
#interface MyAppAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
IBOutlet UITabBarController *rootController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UITabBarController *rootController;
#end
And I have View A, that contain a button to switch to View B. It is the .h file:
#import <UIKit/UIKit.h>
#class MyAppAppDelegate;
#class ViewBController;
#interface ViewAController : UIViewController {
IBOutlet UIView *view;
IBOutlet UIButton *switchToViewBButton;
}
#property (retain, nonatomic) UIView *view;
#property (retain, nonatomic) UIButton *switchToViewBButton;
-(IBAction) startSwitching: (id)sender;
#end
And it is the.m file:
#import "ViewAController.h"
#import "ViewBController.h"
#import "MyAppAppDelegate.h"
#implementation ViewAController
/*skip the default generated codes*/
-(IBAction) startClock: (id)sender{
NSLog(#"Start Switching");
[rootController presentModalViewController:ViewBController animated:YES];
}
Plz notice that the ViewB is not enable to display on UITabBarController, it only appear, when the ViewA button is clicked. Also, I found that the debugger tell me that the rootController is undeclared. but I already import MyAppDelegate to the file. thz a lot... ...
You need to synthesize the rootController instance:
#synthesize rootController;
Then it should work. Put this line of code below the implementation line in the .m file. There is no reason why you should be getting the second error, so try my solution and then tell us what happened.
Also, please try to write in complete sentences. In my experience, if you write well in a forum post, you will gain more respect from people who might help you.
No you need to do something like this:
ViewBController* vc = [[ViewBController alloc] initWithNib: #"ViewBController" mainBundle: nil];
if (vc != nil) {
[rootController presentModalViewController: vc animated:YES];
[vc release];
}
The mistake that you are making is that you are passing presentModalViewController: the class of the ViewBController. Instead it needs an instance.
ViewBController* viewBController = [[[ViewBController alloc] initWithNibName: #"NameOfViewBControllerNibFile" bundle:nil] autorelease];
[self presentModalViewController:viewBController animated:YES];
You can not access rootController from ViewAController, because it is a property of MyAppAppDelegate, not ViewAController. If you want to access the UITabBarController in charge of ViewAController, then inside ViewAController you use self.tabBarController
So if you want the UITabBarController to do the above, change it to
ViewBController* viewBController = [[[ViewBController alloc] initWithNib: #"NameOfViewBControllerNibFile" mainBundle: nil] autorelease];
[self.tabBarController presentModalViewController:viewBController animated:YES];
ViewBController *vc = [[[ViewBController alloc] initWithNib:#"ViewBController"
mainBundle:nil] autorelease];
MyAppDelegate *appDelegate = (MyAppAppDelegate *)[UIApplication sharedApplication].delegate;
[appDelegate.rootController presentModalViewController:vc animated:YES];
Related
I am trying change an UIImageView from other viewControllers, but I don't know why image does not change !! here is my code :
#import "ViewController.h"
#class ViewController;
#interface CoverGallery : UIViewController {
ViewController *mainViewController;
}
#property (nonatomic,retain) ViewController *mainViewController;
- (IBAction)img1;
.m
- (IBAction)img1 {
mainViewController.coverArt.image = [UIImage imageNamed:#"coverDefault.png"];
[self dismissModalViewControllerAnimated:YES];
}
There is an UIImageView called coverArt in MainViewController , thanks
Here is my button action which switch between views :
ViewController (My First view)
.h
#interface ViewController : UIViewController {
ViewController *mainViewController;
}
#property (nonatomic, retain) ViewController *mainViewController;
.m :
#synthesize mainViewController;
- (void) CoverGallery {
CoverGallery *gallery = [[CoverGallery alloc] initWithNibName:#"CoverGallery" bundle:nil];
gallery.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:gallery animated:YES];
//here is the problem, compiler gives me the mainViewController is not the property of CoverGallery
gallery. mainViewController = self;
[gallery release];
}
How are you initializing the property mainViewController? You need set it as the MainViewController by setting its property when you present the modal view.
I imagine your doing this in the MasterViewController:
CoverGallery *gallery = [[CoverGallery alloc]initWithNibName:#"CoverGallery" bundle:nil];
gallery.masterViewContrller = self; //Set it here
[self presentModalViewController:gallery animated:YES];
I fixed a typo..
and this:
ViewController *mainViewController;
should be:
MainViewController *mainViewController;
but you need to Import it in the same header file.
EDIT: Working, see code below.
Working on an application, where right now I have the AppDelegate class, and a custom UINavigationController class. The code i have right now is pretty simple, and I feel like I've setup the XIB correctly. The build succeeds with no errors. But when the app launches, the navigationcontroller isnt displayed. I do not see the nav bar nor the table view. All I see is a blank screen. Here's the bulk of my code:
//
// FTPPhotosAppDelegate.h
// FTPPhotos
//
// Created by Aaron McLeod on 11-05-30.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import <UIKit/UIKit.h>
#import "RootViewController.h"
#interface FTPPhotosAppDelegate : NSObject <UIApplicationDelegate> {
UINavigationController *navigationController;
RootViewController *rootViewController;
}
#property (nonatomic, retain) UINavigationController *navigationController;
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) RootViewController *rootViewController;
#end
//
// FTPPhotosAppDelegate.m
// FTPPhotos
//
// Created by Aaron McLeod on 11-05-30.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "FTPPhotosAppDelegate.h"
#implementation FTPPhotosAppDelegate
#synthesize window=_window;
#synthesize navigationController, rootViewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
navigationController = [[UINavigationController alloc] init];
rootViewController = [[RootViewController alloc] init];
[self.navigationController pushViewController:rootViewController animated:NO];
[self.window addSubview:[self.navigationController view]];
[self.window makeKeyAndVisible];
return YES;
}
#interface RootViewController : UITableViewController<UIImagePickerControllerDelegate> {
NSMutableArray *photos;
UIImagePickerController *picker;
UIBarButtonItem *addPhotoButton;
}
#property (nonatomic, retain) NSMutableArray *photos;
#property (nonatomic, retain) UIImagePickerController *picker;
#property (nonatomic, retain) IBOutlet UIBarButtonItem *addPhotoButton;
- (void) loadPhotos;
- (IBAction) addPhoto;
- (UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize;
#end
#import "RootViewController.h"
#implementation RootViewController
#synthesize photos, picker, addPhotoButton;
- (void)viewDidLoad
{
self.photos = [[NSMutableArray alloc] initWithCapacity:50];
[self loadPhotos];
[super viewDidLoad];
}
Any ideas? Here's a screenshot of the XIB,
.
Let me know if you need more info.
Instead of a root View controller, make it a UINavigationController *navigationController.
then in the applicationDidFinishLaunching, say
navigationController = [[UINavigationController alloc]init];
FirstViewController *firstView = [FirstViewController alloc]init];
[self pushViewController:firstView animated:NO];
firstView.title = #"TITLE";
[self addSubview:navigationController.view];
EDIT: some example code i have in an app of mine
AppDelegate.h
#import <UIKit/UIKit.h>
#interface DragonAge2AppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
UINavigationController *navigationController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#end
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
TitleClass *titlePage = [[TitleClass alloc]init];
navigationController = [[UINavigationController alloc]init];
titlePage.title = #"Dragon Age 2";
[navigationController pushViewController:titlePage animated:NO];
[titlePage release];
// Override point for customization after application launch.
[window addSubview:navigationController.view];
[self.window makeKeyAndVisible];
return YES;
}
You need to check some points:
Is the code in application:didFinishLaunchingWithOptions: executed when you run the application? Add a NSLog(#"app launched") in this code or set a breakpoint in it to check it. If it is not called, your FTPPhotosAppDelegate object is probably not set as the delegate of your UIApplication singleton in the XIB (this connection should be done by default if you created your app using a standard template, but it's worth checking)
Is the navigationController IBOutlet of your AppDelegate properly connected to your actual UINavigationController in the XIB? Check (using an NSLog or a breakpoint) that it is not nil.
Same for the view IBOutlet of the UINavigationController object in your XIB: check that it is properly connected and not nil.
My app is a tab bar application. There are two tabs at the bottom and an outlet on the first tab with a button that leads to a new window. When I build the code in xcode, it succeeds. When I launch the app in the simulator and click the button leading to the new window, it crashes the app. This is my code for the "FirstViewController" and the "GuitarBrandsViewController"
FirstViewController.h-
#import <UIKit/UIKit.h>
#import "GuitarBrandsViewController.h"
#interface FirstViewController : UIViewController {
FirstViewController *firstViewController;
IBOutlet UIWindow *window;
IBOutlet UIWindow *GuitarBrands;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
-(IBAction)gotoGuitarBrands;
#end
FirstViewController.m
#import "FirstViewController.h"
#implementation FirstViewController
#synthesize window;
-(IBAction)gotoGuitarBrands{
GuitarBrandsViewController *screen = [[GuitarBrandsViewController alloc] initWithNibName:nil bundle:nil];
screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:screen animated:YES];
[screen release];
}
GuitarBrandsViewController.h
#import <UIKit/UIKit.h>
#import "FirstViewController.h"
#interface GuitarBrandsViewController : UIViewController {
GuitarBrandsViewController *guitarBrandsViewController;
IBOutlet UIWindow *window;
IBOutlet UIWindow *Main;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
-(IBAction)gotoMain;
#end
GuitarBrandsViewController.m
#import "GuitarBrandsViewController.h"
#implementation GuitarBrandsViewController
#synthesize window;
-(IBAction)gotoMain{
FirstViewController *screen = [[FirstViewController alloc] initWithNibName:nil bundle:nil];
screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:screen animated:YES];
[screen release];
}
I assume you are creating the GuitarBrandsViewController using Interface Builder as the code in the class itself would not work on it's own.
However, when you initialize GuitarBrandsViewController, you don't pass the NIB so you allocate the Controlling Class without the actual NIB information from IB.
Instead of
GuitarBrandsViewController *screen = [[GuitarBrandsViewController alloc] initWithNibName:nil bundle:nil];
Use
GuitarBrandsViewController *screen = [[GuitarBrandsViewController alloc] initWithNibName:#"GuitarBrandsViewController.xib" bundle:nil];
Adjust the nib name to the name of the actual nib you use.
A newbie Objective C question. Im trying to programmaticly change view from another view. But I only succeed in activating the tab button in the tabbarcontroller.
In my ViewDidLoad I have a condition that if thats not met, load the second view instead.
Is there any kind soul that can help out a Objective-C beginner? I have googled and search stackoverflow for the answer but with no luck.
FirstViewController.h
#interface FirstViewController : UIViewController {
some variables
}
some #properties
FirstViewController.m
#import "FirstViewController.h"
#implementation FirstViewController
- (void)viewDidLoad
{
if(condition is met) {
[self.tabBarController setSelectedIndex:1];
}
}
In my AppDelegate.h
#import <UIKit/UIKit.h>
#interface otpAppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> {
UIWindow *window;
UITabBarController *tabBarController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
#end
AppDelegate.m
#implementation otpAppDelegate
#synthesize window;
#synthesize tabBarController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self.window addSubview:tabBarController.view];
[self.window makeKeyAndVisible];
tabBarController = [[UITabBarController alloc] init];
[tabBarController setDelegate:self];
return YES;
}
Edit!
I found a solution to my problem.
int selectedindex = 1;
self.tabBarController.selectedIndex = selectedindex;
UIViewController *tempvc = [[self.tabBarController viewControllers] objectAtIndex:selectedindex];
[self.view removeFromSuperview];
[self.view addSubview:tempvc.view];
Did the trick.
Try setting the index for the tabBarController instance of the app delegate like yourAppDelegate.tabBarController
If you are using tabBarController as IBOutlet , there is no need to allocate it in your app delegate. Please remove these code from your appDelegate method (application: didFinishLaunchingWithOptions)..
tabBarController = [[UITabBarController alloc] init];
[tabBarController setDelegate:self];
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