I am using a split view controller and have an issue when replacing my detail view controller with a new view controller. When I start the app I get my empty view controller as my detail view controller and hit the button on the navigation bar to show the master view controller. When I select a row in master view controller my detail view controller is replaced with the appropriate controller. It works fine the first time you select a row, but every time after that, when a row is selected from the master controller, the master controller doesn't go away so it just stays on top of the detail controller.
AppDelegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
MasterViewController *masterVC = [[MasterViewController alloc]initWithNibName:#"MasterViewController" bundle:nil];
UINavigationController *masterNavController = [[UINavigationController alloc]initWithRootViewController:masterVC];
DetailViewController *detailVC = [[DetailViewController alloc]initWithNibName:#"DetailViewController" bundle:nil];
UINavigationController *detailNavController = [[UINavigationController alloc]initWithRootViewController:detailVC];
masterVC.detailViewController = detailVC;
self.splitViewController = [[UISplitViewController alloc]init];
self.splitViewController.delegate = detailVC;
self.splitViewController.viewControllers = #[masterNavController, detailNavController];
self.window.rootViewController = self.splitViewController;
[self.window makeKeyAndVisible];
return YES;
}
MasterViewController:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
ActionAlertsViewController *rootView = [[ActionAlertsViewController alloc]initWithNibName:nil bundle:nil];
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];
NSMutableArray *details = [self.splitViewController.viewControllers mutableCopy];
if (indexPath.section == 0) {
if (indexPath.row == 0) {
rootView.title = #"Action Alerts";
rootView.background = [UIImage imageNamed:#"capitol"];
rootView.urlString = #"http://kyfbnewsroom.com/category/public-affairs/notifications/feed/";
[rootView fetchEntries];
UINavigationController *detailNav = [[UINavigationController alloc]initWithRootViewController:rootView];
if (details.count > 1) {
[details replaceObjectAtIndex:1 withObject:detailNav];
} else {
[details insertObject:detailNav atIndex:1];
}
appDelegate.splitViewController.viewControllers = details;
appDelegate.window.rootViewController = self.splitViewController;
appDelegate.splitViewController.delegate = rootView;
[appDelegate.splitViewController viewWillAppear:YES];
}
}
}
I don't know where to start:
Don't copy/clone UIViewControllers: [self.splitViewController.viewControllers mutableCopy]
Don't invoke system-initiated messages: [appDelegate.splitViewController viewWillAppear:YES]
Don't reset the root view controller" appDelegate.window.rootViewController
Don't go back to the AppDelegate to find out which view you are
#beyowulf noted: You shouldn't be calling viewWillAppear that is a view controller lifecycle method that is called by the system. You should say something like [self.splitViewController showDetailViewController:detailNav sender:self]
Do read the documentation and follow the tutorials:
Raywenderlich
NSHipster
Related
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
So in my App.Delegate I'm doing this -
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.loginViewController = [[LoginViewController alloc] initWithNibName:#"LoginView" bundle:[NSBundle mainBundle]];
UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController: self.loginViewController];
self.window.rootViewController = navigation;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
and in my login controller I'm doing this -
- (IBAction)login:(UIButton *)sender {
NSString *username = self.userName.text;
NSString *password = self.password.text;
[AccountUtils emailLogin:username password:password useCookie:true callback:^(NSDictionary *loginResponseJSON){
if([loginResponseJSON count] != 0){
[self performSelectorOnMainThread:#selector(displaySearchController) withObject:nil waitUntilDone:YES];
// [self performSelectorOnMainThread:#selector(switchState) withObject:nil waitUntilDone:YES];
} else {
//incorrect entry info view here.
}
}];
}
- (void) displaySearchController {
SearchViewController *searchViewController = [[SearchViewController alloc] initWithNibName:#"SearchView" bundle:[NSBundle mainBundle]];
UINavigationController *navigator = self.navigationController;
[navigator popViewControllerAnimated: YES];
[navigator pushViewController: searchViewController animated:YES];
}
If I correctly login, I go to the second controller's view, but at the top I'm still allowed to go 'back' to the login page. I don't want that to happen and I thought this case would be taken care off by the popViewControllerAnimated line. How do I make it so that when I login, I am not allowed to go back to the login page?(in other words, I guess pop the login controller off the navigation controller's stack?)
If you want just to remove the loginVC you could set the new navigationController as the rootViewController of the AppDelegate after the user has logged in. So you could move the displaySearchController method in the AppDelegate and call this method (from the loginVC) after the user has logged in:
-(void)displaySearchController{
SearchViewController *searchViewController = [[SearchViewController alloc] initWithNibName:#"SearchView" bundle:[NSBundle mainBundle]];
UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController: searchViewController];
self.window.rootViewController=navigation;
}
Otherwise, if you really want the push animation, you can remove the loginVC from the navigationController viewControllers stack in the viewDidAppear of SearchDispalyController:
-(void)viewDidAppear:(BOOL)animated{
NSMutableArray *stackVCs=[self.navigationController.viewControllers mutableCopy];
int idx=[stackVCs indexOfObject:self];
//this remove the previous viewcontroller from the stack
[stackVCs removeObjectAtIndex:idx-1];
self.navigationController.viewControllers=stackVCs;
[super viewDidAppear:animated];
}
Also in the loginVC just before push the searchVC you should call this to hide the back button:
[navigation.navigationItem setHidesBackButton:YES];
You don't want to use a UINavigationController with the LoginViewController and you don't want to push the SearchViewController. Instead, use a UINavigationController with SearchViewController and when you display it, make it the rootViewController.
Do this to achieve what you want.
Move the displaySearchController method to your AppDelegate.m file
Do declare the displaySearchController method in AppDelegate.h file
Now Define the displaySearchController method in AppDelegate.m file as :
- (void) displaySearchController {
SearchViewController *searchViewController = [[SearchViewController alloc] initWithNibName:#"SearchView" bundle:[NSBundle mainBundle]];
UINavigationController *navigator = [[UINavigationController alloc]initWithRootViewController:searchViewController];
self.window.rootViewController = navigator;
}
Call a new local method showNewViewController from your loginController as :
[self performSelectorOnMainThread:#selector(showNewViewController) withObject:nil waitUntilDone:YES];
Now define showNewViewController in your loginController.m file as
-(void)showNewViewController {
AppDelegate *appDele = [UIApplication sharedApplication].delegate;
[appDele displaySearchController];
}
Don't forget to import the AppDelegate.h file to your loginController.m
This will certainly help you.
I create my TabBarController programatically, because I want the same Controller in every tab displaying different content. The content is fetched by an ID.
I use the storyboard id the same way as one would use initWithNibName:.
I do this in the AppDelegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard_iPhone" bundle:nil];
UITabBarController *tabBarController = [[UITabBarController alloc] init];
for (int i = 0; i < 7; i++) {
MyViewController *svc = [storyboard instantiateViewControllerWithIdentifier:#"MyView"];
[svc setID: i];
[tabBarController addChildViewController:svc];
}
[self.window makeKeyAndVisible];
[self.window setRootViewController: tabBarController];
return YES;
}
But the TabBar shows only 5 of the 7 Tabs. This is fine, because only 5 tabs can be visible the same time. Unfortunately the ... More button is not visible. So the last 2 tabs are not accessible.
Does anyone have an idea how to force the More button to show up, or why it does not show up?
Regards!
It's not showing up because you are adding viewcontrollers to the tab bar controller using addChildViewController method which is a UIViewController method and not a tab bar controller method. So i think what's happening is the tab bar controller doesn't really know that it has more than 5 view controllers.
If you want the more view controller to show up, set the viewControllers array of the tab bar controller directly. Modify your code to something like below:
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
UITabBarController *tabBarController = [[UITabBarController alloc] init];
NSMutableArray *vcArray = [NSMutableArray array];
for (int i = 0; i < 7; i++) {
ViewController *svc = [storyboard instantiateViewControllerWithIdentifier:#"MyView"];
[svc setID: i];
[vcArray addObject:svc];
}
[tabBarController setViewControllers:vcArray]; //This is the important part.
[self.window setRootViewController: tabBarController];
[self.window makeKeyAndVisible];
Following is simple example for How can you use UITabBarController
Firsts Create all object of UIViewController and UINavigationController in AppDelegate.h file and use following method of AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window=[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds ]];
self.viewCon=[[ViewController alloc] init];
self.navCon=[[UINavigationController alloc] initWithRootViewController:self.viewCon];
self.navCon.navigationBar.tintColor=[UIColor blackColor];
self.viewCon.title=#"First View";
self.fView=[[FirstViewController alloc] init];
self.FnavCon=[[UINavigationController alloc] initWithRootViewController:self.fView];
self.FnavCon.navigationBar.tintColor=[UIColor blackColor];
self.fView.title=#"Secound View";
self.sView=[[SecoundViewController alloc] init];
self.SnavCon=[[UINavigationController alloc] initWithRootViewController:self.sView];
self.SnavCon.navigationBar.tintColor=[UIColor blackColor];
self.sView.title=#"Third View";
.
.
// create UIViewController and UINavigationController As you need
.
.
.
UIImage *img1=[UIImage imageNamed:#"Australia.gif"];
self.tbItem1=[[UITabBarItem alloc] initWithTitle:#"First Page" image:img1 tag:1];
self.viewCon.tabBarItem=self.tbItem1;
UIImage *img2=[UIImage imageNamed:#"Cameroon.gif"];
self.tbItem2=[[UITabBarItem alloc] initWithTitle:#"Secound Page" image:img2 tag:2];
self.fView.tabBarItem=self.tbItem2;
UIImage *img3=[UIImage imageNamed:#"Canada.png"];
self.tbItem3=[[UITabBarItem alloc] initWithTitle:#"Third Page" image:img3 tag:3];
self.sView.tabBarItem=self.tbItem3;
NSMutableArray *viewArr=[[NSMutableArray alloc] init];
[viewArr addObject:self.navCon];
[viewArr addObject:self.FnavCon];
[viewArr addObject:self.SnavCon];
self.tbCon=[[UITabBarController alloc] init];
self.tbCon.viewControllers=viewArr;
[self.window addSubview:tbCon.view];
[self.window makeKeyAndVisible];
return YES;
}
I'm trying to determine which tab has been selected by the user. I melded this together from a couple of tutorials on iOS tab bars. In my appDelegate I have this code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
//We need to implement the view controllers within the tab controller and make the tab controller the root controller of our app - note we are only using view 1-3 at first.
FirstViewController *fistView = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
SecondViewController *secondView = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
ThirdViewController *thirdView = [[ThirdViewController alloc] initWithNibName:#"ThirdViewController" bundle:nil];
FourthViewController *fourthView = [[FourthViewController alloc] initWithNibName:#"FourthViewController" bundle:nil];
NSArray *viewControllersArray = [[NSArray alloc] initWithObjects:fistView, secondView, thirdView, fourthView, nil];
self.tabController = [[UITabBarController alloc] init];
[self.tabController setViewControllers:viewControllersArray animated:YES];
self.window.rootViewController = self.tabController;
//end custom code
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
Is viewControllerArray the delegate for my tabController?
When I place this code on the page nothing happens:
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
if (tabBarController.selectedIndex == 0) {
NSLog(#"ok");
}
}
In this case, your app delegate should be the delegate for the tabBarController.
You can simply add self.tabController.delegate = self and make sure that your AppDelegate conforms to the UITabBarControllerDelegate protocol.
I also suggest placing a log outside the if in your delegate method, to confirm that it is actually called.
I'm new to UISplitView development, so I'm sure there is something obvious I'm doing wrong. I have a basic UISplitView iPad app that loads up with two UITableView controllers when the app launches. This works just fine.
What I am trying to do is immediately upon launch, presenting an "authentication" view modally so that a user will need to login before continuing. Here is the code I have so far which compiles and works without breaking, but the view is not showing.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
MasterViewController *masterViewController = [[MasterViewController alloc] initWithNibName:#"MasterViewController" bundle:nil];
UINavigationController *masterNavigationController = [[UINavigationController alloc] initWithRootViewController:masterViewController];
DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:#"DetailViewController" bundle:nil];
UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];
self.splitViewController = [[UISplitViewController alloc] init];
self.splitViewController.delegate = detailViewController;
self.splitViewController.viewControllers = [NSArray arrayWithObjects:masterNavigationController, detailNavigationController, nil];
masterViewController.detailViewController = detailViewController;
masterViewController.managedObjectContext = self.managedObjectContext;
self.window.rootViewController = self.splitViewController;
[self presentAuthenticate];
[self.window makeKeyAndVisible];
applicationDidLaunch = YES;
return applicationDidLaunch;
}
- (void) presentAuthenticate {
AuthenticateViewController *loginController = [[AuthenticateViewController alloc] initWithNibName:#"AuthenticateViewController" bundle:nil];
[loginController setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[loginController setModalPresentationStyle:UIModalPresentationFormSheet];
if ([self.splitViewController respondsToSelector:#selector(presentViewController:animated:completion:)]) {
[self.splitViewController presentViewController:loginController animated:NO completion:nil];
} else {
[self.splitViewController presentModalViewController:loginController animated:NO]; //iOS 4 works fine with or without animation
}
}
I defined the AuthenticateViewController as a View with a few textfields in it and have it wired to the File's Owners view.
Thanks ahead of time!
A viewcontroller will not allow to push/present on anotherview unless and until the view is complete loading.
Simple saying we are not allow to call presentModalViewController/pushViewController in a viewcontroller viewDidLoad/viewWillAppear. we need to call this in viewDidAppear.
I had the same issue you said.
Some Solution I can say are,
Do the loading of AuthenticateViewController after [self.window makeKeyAndVisible]; and in a performSelctor (may be with a delay).
Move the code to display AuthenticateViewController in SplitView's DetailView controller viewDidAppear.
thanks,
Naveen Shan