I'm trying to use a navigation controller in my iOS-Project. Here is the setup of my AppDelegate class:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Generate RootViewController (some auto-layout stuff is going on here)
MyLayoutDescriptionGeneratorClass *generator = [MyLayoutDescriptionGeneratorClass new];
MyViewControllerClass *vc = [generator generateViewController];
self.navController = [[UINavigationController alloc] initWithRootViewController:vc];
[self.window setRootViewController:self.navController];
[self.window makeKeyAndVisible];
return YES;
}
The viewDidLoad of my view controller looks like this:
-(void)viewDidLoad{
[super viewDidLoad];
// Generate all subviews and their constraints
self.view = [MyObjectManagerClass viewForParentViewDescription:_parentViewDescription];
self.title = #"Hello";
}
When I Build & Run the navigation bar is shown and its title is set to Hello - unfortunately the view controllers view is not displayed.
If I take out the navigation controller like this
[self.window setRootViewController:self.navController];
everything works great. Can anyone help me please?
I just had to modify my viewDidLoad:
-(void)viewDidLoad{
[super viewDidLoad];
// Generate all subviews and their constraints
UIView *view = [RuiObjectManager viewForParentViewDescription:_parentViewDescription];
self.title = #"Hello";
// Add generated view to self.view and create constraints
[self.view addSubview:view];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[view]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(#"view", view)]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[view]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(#"view", view)]];
}
Related
I am trying to make a clean implementation of programmatically created UI.
I start off with my AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
MainViewController *mainVC = [[MainViewController alloc] init];
UINavigationController *navC = [[UINavigationController alloc] initWithRootViewController:mainVC];
self.window.rootViewController = navC;
[self.window makeKeyAndVisible];
return YES;
}
Then the MainViewController.m is a subclass of UIViewController implements the following:
- (void)loadView {
CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];
MenuView *contentView = [[MenuView alloc] initWithFrame:applicationFrame];
self.view = contentView;
}
And the custom UIView in MenuView.m implements the following
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
NSLog(#"init got called");
NSLog(#"frame size %f %f", self.frame.size.width, self.frame.size.height);
self.backgroundColor = [UIColor greenColor];
}
return self;
}
...
- (void)loadView {
NSLog(#"loadView got called");
UIButton *newButton = [[UIButton alloc] init];
newButton.titleLabel.text = #"New Button";
newButton.backgroundColor = [UIColor blueColor];
[self addSubview:newButton];
NSDictionary *views = NSDictionaryOfVariableBindings(newButton);
[newButton setTranslatesAutoresizingMaskIntoConstraints:NO];
NSDictionary *metrics = #{#"buttonWidth": #(150), #"buttonHeight": #(150)};
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(100)-[newButton(buttonWidth)]"
options:0 metrics:metrics views:views]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:[newButton(buttonHeight)]-(100)-|"
options:0 metrics:metrics views:views]];
}
When I run this, the simulator shows me a green screen - but there is no button. The NSLogs in the init method fire and show a frame size of 320 x 548, but the loadView method does not get called.
What am I doing wrong?
Thanks
- (void)loadView;
is a method of UIViewController class, not UIView's.
So you need to setup its subviews inside init method where you already set background color.
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
// Initialization code
}
return self;
}
When I add a view controller embedded by navigation controller, to a tab bar, its icon + title disappear briefly when coming back to the More tab.
However when the view controller is added as such, the icon+image are okay and don't disappear.
I've tried many things already, and am out of options. Any ideas?
Here's my AppDelegate code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.tabBarController = [[UITabBarController alloc] init];
// Must be placed here, just before tabs are added. Otherwise navigation bar
// will overlap with status bar.
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationSlide];
[self addViewControllersToTabBar];
self.window.rootViewController = self.tabBarController;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
- (void)addViewControllersToTabBar
{
NSArray* tabBarClassNames =
#[
NSStringFromClass([FirstViewController class]),
NSStringFromClass([SecondViewController class]),
NSStringFromClass([FirstViewController class]),
NSStringFromClass([FirstViewController class]),
NSStringFromClass([FirstViewController class]),
NSStringFromClass([SecondViewController class]),
NSStringFromClass([FirstViewController class]),
];
NSMutableArray* viewControllers = [NSMutableArray array];
for (NSString* className in tabBarClassNames)
{
UIViewController* viewController = [[NSClassFromString(className) alloc] init];
UINavigationController* navigationController;
navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
[viewControllers addObject:navigationController];
}
[viewControllers addObject:[[FirstViewController alloc] init]]; // This one is fine.
self.tabBarController.viewControllers = viewControllers;
self.tabBarController.selectedViewController = viewControllers[2];
}
and the view controllers are literally nothing more than:
#implementation SecondViewController
- (instancetype)init
{
if (self = [super init])
{
self.title = #"second";
self.tabBarItem.image = [UIImage imageNamed:#"second.png"];
}
return self;
}
#end
Holy shit, spent so much time on this bug, but here's my workaround. Instead of:
navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
I created my own NavigationController as subclass of UINavigationController:
#implementation NavigationController
- (instancetype)initWithRootViewController:(UIViewController*)rootViewController
{
if (self = [super initWithRootViewController:rootViewController])
{
NSString* className = NSStringFromClass([rootViewController class]);
NSString* name = [className stringByReplacingOccurrencesOfString:#"ViewController" withString:#""];
self.tabBarItem.image = [UIImage imageNamed:[NSString stringWithFormat:#"%#Tab.png", name]];
}
return self;
}
#end
and then do:
navigationController = [[NavigationController alloc] initWithRootViewController:viewController];
Prerequisite is that tab images have the same base name as the view controller class name, which was already the case in my app.
I was setting self.tabBarItem.image inside the view controllers' init method, and this seems to cause the effect I was seeing. So in addition to using my own navigation controller, I also simply deleted setting the tabBarItem in each individual view controller.
I created a navigation controller but i can not set title or add button to the navigation bar.How to do that?
This is the code of application DidFinishLauchingOption in file AppDelegate.m :
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:view];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
self.view = [[ViewController alloc] init];
self.window.rootViewController = self.view;
[self.window addSubview:navController.view];
[self.window makeKeyAndVisible];
return YES;
}
Thanks in advance.
You need to set the rootViewController property of your window object to the navigation controller, rather than your instance of `ViewController. This should point you in the right direction:
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Create and configure a window
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
// Create a view controller
UIViewController *viewController = [[ViewController alloc] init];
// Create a navigation controller and set its root view controller to the instance of `ViewController`
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewController];
// Add the navigation controller to the window
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}
// ...
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Set the view controller's title
self.title = NSLocalizedString(#"View Controller", #"");
// Add a navigation bar button
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:#selector(refreshButtonPressed:)];
}
- (void)refreshButtonPressed:(id)sender
{
// Do something when the refresh button is pressed.
}
// ...
#end
To create your initial setup, you create a navigation controller with your view controller and set it as the root view controller of your app delegate window:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//create window
[self setWindow:[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]];
//create and set root view controller
[[self window] setRootViewController:[[UINavigationController alloc] initWithRootViewController:[[RootViewController alloc] init]]];
//make window key and visible
[self.window makeKeyAndVisible];
//bail
return YES;
}
Then in your view controller, set the title and add your navigation item:
- (void)viewWillAppear:(BOOL)animated
{
//call parent implementation
[super viewWillAppear:animated];
//set view controller title
[self setTitle:#"Root View Controller"];
//add navigation bar button
[[self navigationItem] setRightBarButtonItem:[[UIBarButtonItem alloc] initWithTitle:#"Button Title" style:UIBarButtonItemStyleBordered target:self action:#selector(handleBarButtonItemEvents:)]];
}
And listen for button events via:
- (void)handleBarButtonItemEvents:(id)sender
{
//
}
The problem is pretty simple to understand with pictures.
I have a UINavigationController that allow the user to switch between to views.
The first view contains a search bar and a table view like so :
The second is a basic view where information about the cell are display
When I click on the search bar, the navigation controller gets hidden and the search bar is now at the top.
Now, if I click on a cell, it goes to the second views, but the navigation bar is first hidden like below :
And then, it automatically appears like that :
I have tried a couple of things like show the navigation bar before pushing the next view controller but it is quite ugly..
Does anyone know how to have the show the navigation bar directly on the second view (like in the contact application)?
[UPDATE] : Code
AppDelegate.m (I'm talking about navigationcontroller2)
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
FirstViewController *viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
SecondViewController *viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
viewController1.managedObjectContext = [self managedObjectContext];
viewController2.managedObjectContext = [self managedObjectContext];
viewController1.viewController2 = viewController2;
UINavigationController *navigationcontroller1 = [[UINavigationController alloc] initWithRootViewController:viewController1];
[navigationcontroller1.navigationBar setTintColor:[UIColor lightGrayColor]];
UINavigationController *navigationcontroller2 = [[UINavigationController alloc] initWithRootViewController:viewController2];
[navigationcontroller2.navigationBar setTintColor:[UIColor lightGrayColor]];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:navigationcontroller1, navigationcontroller2, nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
FirstView.m
- (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar {
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (!noResultsToDisplay) {
PinDetailsViewController *pinDetailsViewController = [[PinDetailsViewController alloc] initWithNibName:#"PinDetailsViewController" bundle:nil];
NSManagedObject *managedObject = [fetchedResultsController objectAtIndexPath:indexPath];
Pin *pin = (Pin *) managedObject;
[self.navigationItem setTitle:#"Pins"];
[self.navigationController pushViewController:pinDetailsViewController animated:YES];
[pinDetailsViewController updateWithPin:pin];
}
}
If you need anything else, just ask but I think it's all there.
Try to use this code in each viewcontroller.
- (void) viewWillAppear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:NO animated:animated];
}
- (void) viewWillDisappear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:YES animated:animated];
}
Before you push the new view controller, you should unhide the navigation bar:
[self.navigationController setNavigationBarHidden:NO animated:YES];
I had a similar problem with the position of my navbar. Mine was moving up behind the status bar, and I fixed the issue by manually setting the navbar frame:
-(void)adjustNavBarOrigin
{
CGRect r = self.navigationController.navigationBar.frame;
r.origin = CGPointMake(0, 20); // 20 is the height of the status bar
self.navigationController.navigationBar.frame = r;
}
I had to call this method in a number of places, including viewWillAppear: and didRotateFromInterfaceOrientation:, but it worked a treat :)
Hiding the UINavigationBar can disturb the properties sometimes. Try using the property alpha instead of hidden.
I am working on a small app, according to the requirement the app should have a tabBarItem with 3 items. For this I have programmatically created the tabBarController in the AppDelegate.m file and added the 3 different viewControllers, instantiated them and everything is working good. I see the tabBarItems and all views are working. In one of the views lets say in SecondViewController I show a popOverController where I used a UITableView and populate it with items. When I click one of the items it should show another view lets say sendFeedback. Until there everything is working fine, but as soon as this sendFeedback is presented as the modal view, it occupies the whole app i.e it hides the tabBarItem.
I present the important pieces of code here for review:
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
viewController1.title = #"First";
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
viewController2.title = #"Second";
UITableViewController *tableView3 = [[tableViewController alloc]initWithNibName:#"tableViewController" bundle:nil];
tableView3.title = #"Third";
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, tableView3 ,nil];
self.tabBarController.delegate = self;
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
[viewController1 release];
[viewController2 release];
[tableView3 release];
return YES;
}
In my popOverViewController.m file I am checking which row is selected in the table according to that I present the view
#pragma mark - TableView Delegate Methods
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
sendFeedback *sendEmailViewController = [[sendFeedback alloc]initWithNibName:#"sendFeedback" bundle:nil];
downLoad *downloadFilelViewController = [[downLoad alloc]initWithNibName:#"downLoad" bundle:nil];
if (indexPath.row == 0)
[self presentModalViewController:sendEmailViewController animated:YES];
else
[self presentModalViewController:downloadFilelViewController animated:YES];
}
Can anyone guide me how to overcome this with the multiple views. In case if anyone requires more information from my side I would be glad to provide.
NOTE: It is the same with the other view (downLoad) as well
EDIT: Here is how I am initializing my PopOverController in the AppDelegate.m file
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
if([viewController isKindOfClass:[SecondViewController class]]){
NSInteger index = [[self tabBarController] selectedIndex];
CGRect buttonFrame = [[[[[self tabBarController] tabBar] subviews] objectAtIndex:index+1] frame];
PopOverViewController *popoverView = [PopOverViewController new];
popoverView.contentSizeForViewInPopover = CGSizeMake(250, 85);
popover = [[UIPopoverController alloc]initWithContentViewController:popoverView];
NSLog(#"X:%f Y:%f",buttonFrame.origin.x,buttonFrame.origin.y);
[popover presentPopoverFromRect:buttonFrame inView:self.tabBarController.tabBar permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
}
Thanks
Modal view controllers are used to "block" your application and fulfill a task before you can proceed. So modal view controllers are not what you want to use.
Instead wrap your controllers which have to be shown in the popover in a navigation controller. In the tableView:didSelectRowAtIndexPath: method you can push the corresponding view controller to the navigation stack.
To slove your problem:
At the place where you create the popovercontroller initialize it with a new UINavigationController. And the navigation controller you have to initialize with a rootviewcontroller namely PopOverViewController.m.
PopOverController *popoverContentController = [[PopOverController alloc] init];
UINavigationController *navcon = [[UINavigationController alloc] initWithRootViewController:popoverContentController];
popoverController = [[UIPopoverController alloc] initWithContentViewController:popoverContentController];
And in PopOverController.m
if (indexPath.row == 0)
[self.navigationController pushViewController:sendEmailViewController animated:YES];
else
[self.navigationController pushViewController:downloadFilelViewController animated:YES];