My program was working perfectly in iOS 4/Xcode 3. I recently upgraded to the newest version Xcode 4/iOS 5. I get a "SIGABRT" on the following line:
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
This line is in the application did finish launching in the delegate. Here is some sample code:
- (void)applicationDidFinishLaunching:(UIApplication *)application {
rootViewController = [[MyCustomViewController alloc] initWithStyle:UITableViewStylePlain];
rootViewController.window = window;
window.rootViewController = rootViewController;
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
}
Any help is appreciated.
It's quite strange how do use your applicationDidFinishLaunching method.
If you wanto to add a UINavigationController as a rootViewController for your window and then initialize that navigation controller with an instance of MyCustomViewController do the following:
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// code for creating a window
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
MyCustomViewController* myCustomViewController = [[[MyCustomViewController alloc] initWithStyle:UITableViewStylePlain] autorelease];
UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:myCustomViewController] autorelease];
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
}
window within your application delegate .h is like
#property (nonatomic, strong) UIWindow* window; // using ARC
or
#property (nonatomic, retain) UIWindow* window; // using not ARC
The property is also synthesised in your application delegate .m like
#synthesize window;
Some notes:
When you use window.rootViewController you don't need to call [window addSubView:someview]. It is already handled for you by iOS 4.
Are you sure that your code works in older sdks?
Hope it helps.
The "normal" way to initialize window is like this:
window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
window.rootViewController = [Myclass alloc] init...
You're doing it other way round with
rootViewController.window = window;
and then
window.rootViewController = rootViewController; ???
Did that really work with the old xcode?
Related
I am a newbie in iOS Development trying to learn how to create and set views programmatically.
i am trying to do swift statement in Obj-C
window?.rootViewController = UINavigationController(rootViewController : ViewController())
Project: Single View Application . Trying to link default Created ViewController.h
As per Krunals Answer i updated code but Navigation Controller is not shown in simulator
Cmd+Click on controller does not navigate to ViewController File
#import "AppDelegate.h"
#import "ViewController.h"
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
UIScreen *screen=[[UIScreen alloc]init];
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.makeKeyAndVisible;
ViewController *controller = [[ViewController alloc] init];
window.rootViewController = [[UINavigationController alloc] initWithRootViewController:controller] ;
Initialise your view controller ViewController before you add (use as root controller of navigation) into navigation controller stack.
Here is sample code to initialise simple view controller
UIViewController *controller = [[UIViewController alloc] init];
Here is sample code to initialise using storyboard
ViewController *controller = [[UIStoryboard storyboardWithName:#"Main" bundle:nil] instantiateViewControllerWithIdentifier:#"<ViewController - string identifier of your view controller>"];
Here is sample code to initialise using NIB/Bundle
ViewController *controller = [[ViewController alloc] initWithNibName:#"<ViewController - string NIB name>>" bundle:nil];
According to your code and following comment try this code only (remove other codes from your app delegate launch):
// make sure your NIB name is 'ViewController'
ViewController *controller = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
if (controller != nil) {
self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController: controller];
self.window.makeKeyAndVisible;
} else {
//print - your view controller is nil
}
Thanks to Krunal for detailed answer .
Thanks to dan for support
i found issue instead of self.window.rootViewController , i typed window.rootViewController.
setting self.window.rootViewController solved issue.
i dont know difference between self.window.rootViewController and window.rootViewController and reason for issue.
If some one knows answer please provide answer on comment
#import "AppDelegate.h"
#import "ViewController.h"
#interface AppDelegate ()
#end
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
UIScreen *screen=[[UIScreen alloc]init];
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.makeKeyAndVisible;
ViewController *controller = [[ViewController alloc] init];
self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:controller] ;
Delele the file Main.storyboard and let the Main interface option empty before you do it.
And add this code:
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.window.backgroundColor = [UIColor whiteColor];
ViewController *vc = [[ViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
UPDATE: If you want to use storyboard with UINavigationController, try this:
Adding UIViewController and adding with UINavigationController
UIStoryboard *storyboard = self.window.rootViewController.storyboard;
UIViewController *rootViewController= [storyboard instantiateViewControllerWithIdentifier:kIdentifier];
[self setRootViewController:rootViewController];
#pragma mark - Set RootView Controller
-(void)setRootViewController:(UIViewController *)rootViewController {
self.window.rootViewController = rootViewController;
[self.window makeKeyAndVisible];
}
UIStoryboard *storyboard = self.window.rootViewController.storyboard;
UIViewController *rootViewController= [storyboard instantiateViewControllerWithIdentifier:kIdentifier];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
[self setRootViewController:navController];
-(void)setRootViewController:(UINavigationController *)rootViewController {
self.window.rootViewController = rootViewController;
[self.window makeKeyAndVisible];
}
I copied the example from View Controller Catalog for iOS made some changes to the colour and expected to see them reflected on the simulator. Nothing happens ???
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
UIViewController *myViewController = [[MyViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:myViewController];
[navigationController setNavigationBarHidden:NO animated:YES];
navigationController.title = #"Hello";
navigationController.navigationBar.barStyle = UIBarStyleBlack ;
navigationController.navigationBar.translucent = NO;
navigationController.navigationBar.tintColor = [UIColor blackColor];
navigationController.navigationBar.barTintColor = [UIColor greenColor];
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
window.rootViewController = navigationController;
[window makeKeyAndVisible];
return YES; }
What do I do wrong?
Several things: First: be sure than in the General information of your target app, in Main Interface field is blank. (If you don´t find it, delete all *.storyboard files that you have).
Second: In your AppDelegate.h should be this property:
#property (strong, nonatomic) UIWindow *window;
And last: Change this in your code:
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
In order to know changes is better step by step. (.title is in ViewController).
I am new to iOS. And I want to use navigation controller in my application but I have no any idea how to do it. So can any one guide me step by step for creating navigation in my application.
In appDelegate.h
#property (strong, nonatomic) UINavigationController *navController;
and set the delegate UINavigationControllerDelegate and synthesise object in appDelegate.m
now,
appDelegate.m
you can set navigation controller in didFinishLaunchingWithOptions method
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
frstVwCntlr = [[firstViewController alloc] initWithNibName:#"firstViewController" bundle:nil];
self.navController = [[UINavigationController alloc] initWithRootViewController:self.frstVwCntlr];
self.window.rootViewController = self.navController;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
In the above code , your firstViewController is set to UINavigationController and UINavigationController added to UIWindow like
self.window.rootViewController = self.navController
Hope this may help you
If you want to create everything programmatically you have to do it in AppDelegate.
But if you don't want to do it programmatically, then just select the ViewController in Storyboard then select menu options:
Editor > Embed In > Navigation Controller
You can creat UINavigationController in Appdelegate and set your first viewcontroller on it.
So for creating a UINavigationController programatically without using storyboards, go to your app delegate and do the following. Create two properties, window and viewController
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor=[UIColor clearColor];
self.viewController = [[YourFirstViewController alloc] initWithNibName:#"YourFirstViewController" bundle:nil];
UINavigationController *navController=[[UINavigationController alloc]initWithRootViewController:self.viewController];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
// Override point for customization after application launch.
return YES;
}
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
ImageViewController2 *dealVC = (ImageViewController2 *)[storyboard instantiateViewControllerWithIdentifier:#"ImageViewController2"];
[self.navigationController pushViewController:dealVC animated:YES];
where ImageViewController2 is a class name
Here is the code that you should write in app delegate.
UIViewController *vc=[[UIViewController alloc]initWithNibName:#"vc1" bundle:nil];
UIView *view=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 568)];
view.backgroundColor=[UIColor redColor];
[vc setView:view];
self.navme=[[UINavigationController alloc]initWithRootViewController:vc];
self.window.rootViewController = self.navme;
For Swift 3.0, using filter:
let desiredController = self.navigationController!.viewControllers.filter { $0 is YourController }.first!
self.navigationController!.popToViewController(desiredController, animated: true)
I have successfully created and implemented a custom UITabBarController with a custom UITabBar following this tutorial. It works fine until I have to hide it.
I'm not using Storyboards or IB and I have to get a reference to my existing UITabBarController which is on screen to hide a custom UIView in it. I'm trying to do it this way but it's only creating a new instance of that UITabBarController and not pointing me to the original instance I see onscreen:
SGTabBarController *tabBarController = [[SGTabBarController alloc] init];
[tabBarController hideCustomTabBar];
SGTabBarController.h
#interface SGTabBarController : UITabBarController
#property (nonatomic) int tabBarHeight;
-(void)hideCustomTabBar;
-(void)showCustomTabBar;
#end
SGTabBarController.m
-(void)hideCustomTabBar{
customTabBarView.hidden = YES;
NSLog(#"HIDDEN!!!");
}
-(void)showCustomTabBar{
customTabBarView.hidden = NO;
}
Any ideas on how to get to it? Thanks in advance!
How I am able to access a custom UITabBarController anywhere in the app.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Set up the Dashboard
//
_window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[_window makeKeyAndVisible];
UITabBarController *tabBarController = [[UITabBarController alloc] init];
NSMutableArray *tabBarItems = [#[] mutableCopy];
// Repeat this for any amount of ViewControllers
UITableViewController *tableViewController = [UITableViewController alloc] initWithStyle:UITableViewStylePlain];
UINavigationController *navController = [UINavigationController alloc] initWithRootViewController:tableViewController];
[tabBarItems addObject:navController];
tabBarController.viewControllers = tabBarItems;
self.window.rootViewController = tabBarController;
return YES;
}
I really don't know how to explain this without pasting all my code, but ill give it a shot. "Assuming" my .hs and .ms are accurate, i have a feeling my .xib is not set correctly, but i cant really paste the code from that. Instead i've zipped the files and uploaded the source code. (if you are brave enough, it's here: http://bit.ly/ZtDkGi ) Im getting a successful build, but my emulator's screen is just black after the app launches.
Essentially, i had to manually add an appDelegate object. i set the class to the appropriate class - but its still not pulling. If someone would be kind enough to help, that would be great.
here's my Test_TableViewAppDelegate.h
#import <UIKit/UIKit.h>
#interface Test_TableViewAppDelegate : NSObject <UIApplicationDelegate>
{
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UINavigationController *navController;
#end
here's my new Test_TableViewAppDelegate.m
#import "Test_TableViewAppDelegate.h"
#implementation Test_TableViewAppDelegate
#synthesize window=_window;
#synthesize navController=_navController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
//self.window.backgroundColor = [UIColor whiteColor];
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
window.backgroundColor = [UIColor greenColor];
self.window = window;
UIViewController *fvc = [[UIViewController alloc] init];
UIViewController *rootController = [[UIViewController alloc] initWithNibName:#"RootViewController" bundle:nil];
UINavigationController *nc = [[UINavigationController alloc]initWithRootViewController:rootController];
//UINavigationController *nc = [[UINavigationController alloc]initWithRootViewController:fvc];
self.navController = nc;
//[self.window addSubview: nc.view];
//[self.window makeKeyAndVisible];
self.window.rootViewController = self.navController;
[self.window makeKeyAndVisible];
return YES;
}
RootViewController.h
#import <UIKit/UIKit.h>
#interface RootViewController : UITableViewController {
NSMutableArray *petsArray;
}
#end
RootViewController.m
#import "RootViewController.h"
#interface RootViewController ()
#end
#implementation RootViewController
and last but not least, main.m ( i think this might be an issue too)
#import "Test_TableViewAppDelegate.h"
int main(int argc, char *argv[])
{
#autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([Test_TableViewAppDelegate class]));
}
}
thanks in advance. i'd appreciate it :D
in your delegate Test_TableViewAppDelegate
why you adding views two times to the window?
// you could remove these two lines
[self.window addSubview: nc.view];
[self.window makeKeyAndVisible];
//keep these two lines
self.window.rootViewController = self.navController;
[self.window makeKeyAndVisible];
And this view you are adding to the navigationController it is not initalized with any nib name
UIViewController *fvc = [[UIViewController alloc] init];
initialization should be like this instead in your delegate
RootViewController *rootController = [[RootViewController alloc] initWithNibName:#"RootViewController" bundle:nil];
UINavigationController *nc = [[UINavigationController alloc]initWithRootViewController:rootController];
I believe the reason that you're getting a black screen is that you are not properly allocating and initializing your navigation controller!
Instead, you should try this code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
// create the base window
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
window.backgroundColor = [UIColor greenColor];
self.window = window;
[window release];
// this is the home page from the user's perspective
FirstViewController *fvc = [[FirstViewController alloc] init];
UINavigationController *nc = [[UINavigationController alloc]initWithRootViewController:fvc];
self.navigationController = nc;
[fvc release];
[nc release];
// show them
[self.window addSubview: nc.view];
[self.window makeKeyAndVisible];
return YES;
}
Hope this works!