I have been using .storyboard file and corresponding .h and .m files to show a simple barcode scanner in my application.
What is the issue behind this?
try creating new reference from UIWindow.
`- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
CGRect windowFrame = UIScreen.mainScreen.bounds;
UIWindow *theWindow = [[UIWindow alloc] initWithFrame:windowFrame];
UIViewController *viewController = [[UIViewController alloc] initWithNibName:nil bundle:nil];
theWindow.rootViewController = viewController;
[self setWindow:theWindow];
return YES;
}
I think you should use SceneDelegate class
#implementation SceneDelegate
- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
self.window = [[UIWindow alloc] initWithWindowScene:(UIWindowScene *)scene];
UIViewController *vc = [[UIViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:vc];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
}
Related
this is demo ,I set RootViewController in didFinishLaunchingWithOptions,but viewController's viewWillAppear is not called! I guess it's because the NavigationController added the ViewController that the response chain of the message failed?
I know it should be set to
self.window.rootViewController = navigationController
But I want to know what I set to
self.window.rootViewController = mainViewController
Why not call mainViewController's viewWillAppear? Thank you.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.window.backgroundColor = [UIColor whiteColor];
ViewController *mainViewController = [[ViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:mainViewController];
self.window.rootViewController = mainViewController;
[self.window makeKeyAndVisible];
return YES;
}
viewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
}
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
NSLog(#"viewWillAppear");
}
#end
Hm... interesting.
Keeping the following:
[[UINavigationController alloc] initWithRootViewController:mainViewController];
even though it's not used, seems to be stealing the ViewController's viewDidAppear.
If you comment that line then it works as you want.
i.e:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.window.backgroundColor = [UIColor whiteColor];
ViewController *mainViewController = [[ViewController alloc] init];
//Comment the navigationController instantiation
//UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:mainViewController];
self.window.rootViewController = mainViewController;
[self.window makeKeyAndVisible];
return YES;
}
Maybe the navigationController was set to own the ViewController but since it's not presented on the screen, neither the viewDidLoad nor viewDidAppear occurs until later, but... when you reassign the ViewController to the window, the internal view loading logic feels viewDidAppear is no longer needed to be called.
Maybe a bug or intentional, I don't know.
Note: I don't really have a reason for this behavior. I am just shedding light on what caused it.
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];
}
My MainViewController loads another view modally.
#implementation MainViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UIViewController *uiViewController = [storyboard instantiateViewControllerWithIdentifier:#"splashViewController"];
[uiViewController setModalPresentationStyle:UIModalPresentationCustom];
[uiViewController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentViewController:uiViewController animated:YES completion:nil];
}
When I load the MainViewController directly from the AppDelegate, the modal view is loaded.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
UIViewController *rootController = [[RootViewController alloc] init];
navigationController = [[UINavigationController alloc] initWithRootViewController:rootController];
[navigationController setNavigationBarHidden:true];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.window setRootViewController:navigationController];
[self.window makeKeyAndVisible];
return YES;
}
If I load the MainViewController as a child controller of another controller, then the modal view fails to load.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.drawerViewController.leftViewController = self.leftDrawerViewController;
self.drawerViewController.centerViewController = self.mainViewController;
self.drawerViewController.animator = self.drawerAnimator;
UIViewController *rootController = self.drawerViewController;
navigationController = [[UINavigationController alloc] initWithRootViewController:rootController];
[navigationController setNavigationBarHidden:true];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.window setRootViewController:navigationController];
[self.window makeKeyAndVisible];
return YES;
}
The main view still loads. It's only that the modal view is not created.
What's causing the problem and how can I resolve this?
You should not present another view controller from viewDidLoad method ,
by that time , current view is NOT finished with its view-hieararchy changes ,
You can present new viewcontroller after viewDidAppear is called ,
so you can move that code to viewDidAppear
I am having a little hard time here, forgive me if you think my problem is so easy for you.
I am trying to create app using UISplitView. The 1st View on the left is a TableView and the other one on the right is just a normal view.
This is my Code for in AppDelegate.m for UISplitView.
#import "AppDelegate.h"
#import "MasterViewController.h"
#import "DetailViewController.h"
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
MasterViewController *masterVC = [[MasterViewController alloc]init];
DetailViewController *detailVC = [[DetailViewController alloc]init];
UISplitViewController *splitVC = [[UISplitViewController alloc]init];
[splitVC setViewControllers:[NSArray arrayWithObjects:masterVC,detailVC,nil]];
[self.window setRootViewController:splitVC];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
Now, I want to add a Navigation Bar on the TableView, I just don't know how to add if I am using SplitView,but I can when I am using a single TableView.
This is my Code in AppDelegate.m using a single View Application that uses TableView. (This is working)
#import "AppDelegate.h"
#import "ViewController.h"
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
//create UINavigationController
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.viewController];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
return YES;
}
Hope you can understand what I'm trying to say. I can't post images since i don't have enough reputation. AGAIN.. The question is "How can I add Navigation Controller in my TableView if I used UISplitView?"
Do you think it will be easy for me if I use storyboards instead of using two XIB files?Hope you can help me.
Thanks in advanced!
try this code
in AppDelegate.h file
UINavigationController *detailNavigationController;
UINavigationController *masterNavigationController;
UISplitViewController *HomeSpilitView;
HomeSpilitViewController *HomeMster;
HomeDetailsViewController *HomeDetailsViewControllers;
in AppDelegate.m file
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
NSMutableArray *array = [NSMutableArray array];
HomeSpilitView = [[[UISplitViewController alloc] init]autorelease];
HomeMster = [[HomeSpilitViewController alloc] initWithNibName:#"HomeSpilitViewController" bundle:nil];
masterNavigationController = [[[UINavigationController alloc] initWithRootViewController:HomeMster] autorelease];
HomeMster.title=#"Title home";
masterNavigationController.navigationBar.tintColor =[UIColor colorWithRed:255/255.0 green:108/255.0 blue:61/255.0 alpha:0.1];
[array addObject:masterNavigationController];
HomeDetailsViewController *HomeDetailsViewControllers = [[HomeDetailsViewController alloc] initWithNibName:#"HomeDetailsViewController" bundle:nil];
detailNavigationController = [[[UINavigationController alloc] initWithRootViewController:HomeDetailsViewControllers] autorelease];
detailNavigationController.navigationBar.tintColor =[UIColor colorWithRed:255/255.0 green:108/255.0 blue:61/255.0 alpha:0.1];
HomeDetailsViewControllers.title=#"details title";
HomeMster.objHomeDetailsViewcontroller=HomeDetailsViewControllers;
HomeSpilitView.delegate = HomeDetailsViewControllers;
[array addObject:detailNavigationController];
[HomeSpilitView setViewControllers:array];
[self.window setRootViewController:HomeSpilitView];
[self.window makeKeyAndVisible];
return YES;
}
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?