This question already has an answer here:
Closed 10 years ago.
Possible Duplicate:
Switching from UIViewController to UITabBarController
Im trying to show a UIViewController for 2 seconds before the UITabBarController, i know i have to make it fromm my appdelegate. Ive tried by first assigning my self.window.rootviewcontroller to my UIViewController and with a scheduled timer after 2 seconds reassigning my self.window.rootviewcontroller to my UITabViewController.
The problem is that when i test it, my viewcontroller shows up, but after the 2 seconds the app crashes.
This is my LaMetro_88AppDelegate.h
#interface LaMetro_88AppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate>
{
UIView *startupView;
NSTimer *timer;
UIViewController *LoadingViewController;
UITabBarController *tabBarController;
}
-(void)changeView;
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
#property (nonatomic, retain) IBOutlet UIViewController *LoadingViewController;
#end
This is my LaMetro_88AppDelegate.m
#implementation LaMetro_88AppDelegate
#synthesize window = _window;
#synthesize tabBarController = _tabBarController;
#synthesize LoadingViewController = _LoadingViewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window.rootViewController = self.LoadingViewController;
timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(changeView:) userInfo:nil repeats:NO];
[self.window makeKeyAndVisible];
return YES;
}
-(void)changeView
{
self.window.rootViewController = self.tabBarController;
}
Because the changeView method doesn't take a parameter, it's method signature doesn't include a colon. Change your selector to changeView without the colon:
#selector(changeView)
Change this:
timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(changeView:) userInfo:nil repeats:NO];
To this:
timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(changeView) userInfo:nil repeats:NO];
Related
Im trying to show a UIViewController for 2 seconds before the UITabBarController, i know i have to make it fromm my appdelegate. Ive tried by first assigning my self.window.rootviewcontroller to my UIViewController and with a scheduled timer after 2 seconds reassigning my self.window.rootviewcontroller to my UITabViewController.
The problem is that when i test it, my viewcontroller shows up, but after the 2 seconds the app crashes.
This is my LaMetro_88AppDelegate.h
#interface LaMetro_88AppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate>
{
UIView *startupView;
NSTimer *timer;
UIViewController *LoadingViewController;
UITabBarController *tabBarController;
}
-(void)changeView;
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
#property (nonatomic, retain) IBOutlet UIViewController *LoadingViewController;
#end
This is my LaMetro_88AppDelegate.m
#implementation LaMetro_88AppDelegate
#synthesize window = _window;
#synthesize tabBarController = _tabBarController;
#synthesize LoadingViewController = _LoadingViewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window.rootViewController = self.LoadingViewController;
timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(changeView:) userInfo:nil repeats:NO];
[self.window makeKeyAndVisible];
return YES;
}
-(void)changeView
{
self.window.rootViewController = self.tabBarController;
}
Your app is crashing because your selector has a colon after it (changeView:) whereas, the method does not. Just delete that colon. Also, there is no need to have a ivar for the timer or even to assign the timer creation to anything -- that line can just be:
[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(changeView) userInfo:nil repeats:NO];
If I load the app for the first time it goes to the correct survey view, but then when i shut down the app by double clicking the home button and exiting out of it on the bottom of the iphone, then reopen the app, the app crashes instead of properly going to the returning user view controller, this view controller is just named viewController and the survey one is surveyViewController...
the following code does not work:
AppDelegate.h:
#import <UIKit/UIKit.h>
#class ViewController;
#class SurveyViewController;
#interface AppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#property (strong, nonatomic) SurveyViewController *home;
#property (strong, nonatomic) ViewController *home2;
#property (nonatomic, retain) UINavigationController *navController;
#property (nonatomic, retain) UINavigationController *navController2;
#property (strong, nonatomic) ViewController *viewController2;
#property (strong, nonatomic) SurveyViewController *viewController;
#end
AppDelegate.m:
#import "AppDelegate.h"
#import "ViewController.h"
#import "SurveyViewController.h"
#implementation AppDelegate
#synthesize window = _window;
#synthesize viewController = _viewController;
#synthesize viewController2 = _viewController2;
#synthesize home, home2, navController, navController2;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
if ([[NSUserDefaults standardUserDefaults] boolForKey:#"HasFilledSurvey"] == NO) {
home = [[SurveyViewController alloc] initWithNibName:#"SurveyViewController" bundle:nil];
self.navController = [[UINavigationController alloc]initWithRootViewController:home];
self.window.rootViewController = self.navController;
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"HasFilledSurvey"];
}
else {
home2 = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
self.navController2 = [[UINavigationController alloc]initWithRootViewController:home2];
self.window.rootViewController = self.navController2;
}
[self.window makeKeyAndVisible];
return YES;
}
Thank you
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.
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];
I have a very strange behaviour of my navigation view. What I want is, that from my main view, the user can touch a button, which leads him to the view with the application settings.
Here is the code, responsible for the navigation:
AppDelegate.h
#interface AppDelegate : NSObject {
UIWindow *window;
ViewController *viewController; // My Main View Controller
UINavigationController *navigationController; }
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet ViewController *viewController;
#property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
AppDelegate.m
#synthesize viewController;
#synthesize window;
#synthesize navigationController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[window addSubview:viewController.view];
[window addSubview:navigationController.view];
[window makeKeyAndVisible];
return YES;
}
viewController.h
#import
#import "optionsViewController.h" // the 'settings' view controller
#class AppDelegate;
#interface ViewController : UIViewController {
AppDelegate *appDelegate;
viewController.m
- (IBAction)showOptionsViewController:(UIBarButtonItem *)sender {
// optionsController.theSubjectID = self.theSubjectID;
// [self presentModalViewController:self.optionsController animated:YES];
optionsViewController *optionsController= [[optionsViewController alloc] initWithNibName:#"optionsViewController" bundle:nil];
optionsController.theSubjectID = self.theSubjectID;
[self.navigationController pushViewController:optionsController animated:YES];
[optionsController release];
}
My optionsController is a 'normal' UIViewController. As you see did I change the load of the optionsController from modal to navigation. Could it be, that I missed something here?
Thanks for any hints in advance.
Cheers, René
Have you connected it up in Interface Builder if not you need to alloc/init it before you add it as a subview?