I've created an almost-empty UIViewController class named MyViewController. In the viewDidLoad I'm setting the title and adding a close-button to the navigationItem.leftBarButtonItem.
I'm presenting my MyViewController like this:
MyViewController *myViewController = [[MyViewController alloc] init];
UINavigationController *nc = [[UINavigationController alloc] myViewController];
nc.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController:nc animated:YES];
When the viewController is presented, the background of it's view is just black. How can I setup it's view to fill-out the screen with an empty view -- just like when the UIViewController is setup in a Storyboard?
I've tried adding the following to the viewDidLoad, but the view is still black:
self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
By default a VC's view gets created in -loadView which you usually neither call, nor override. It gets called automatically the first time you request the the VC's view property.
The view's size is automatically set to the 'empty space', like everything except for the status bar without a NavigationController, minus the navbar when using one etc. You shouldn't worry about its size - usually it's just fine.
You can add your own views in -viewDidLoad and remove them again (for low-memory reasons) in -viewDidUnload.
You can add an UIImageView with custom image and then sent it to back
So in your viewcontrollers viewDidLoad
UIImageView *back = [[UIImageView alloc]initWithImage:[UIImage imageNamed:#"MyBG"]];
[self.view addSubview:back];
[self.view sendSubViewToBack:back];
If you are using a XIB file you should init the view controller through the method initWithNibName: bundle:
Related
I'm trying to go from one xib to another and I'm using TabBar.
When I move from xib to xib with PresentModalViewController I lose the TabBar.
When I use this way, it fail (like force close in android):
FirstViewController *fvc = [[FirstViewController alloc]initWithNibName:#"FirstViewController" bundle:nil];
[fvc setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
fvc.userSelectedLatitude = saveLatitude;
fvc.userSelectedLongitude = saveLongtitude;
UITabBarController *tabControl = [[UITabBarController alloc] initWithNibName:fvc bundle:nil];
[self presentModalViewController:tabControl animated:NO];
When I use:
UITabBarController *tabControl = [[UITabBarController alloc] initWithNibName:#"FirstViewController" bundle:nil];
I get black screen with TabBar.
Since it all fail I guess it is not the right way.
So, what is the right way to do it?
The code above crashes because you are trying to pass a view controller instead of an NSString object in the initWithNibName:bundle: method.
The way to do it depends of what you really want to do. Do you want to present the xib in a modalViewController with or without a tabBar?, or simply present the view controller modally?.
UPDATE:
Fine, you have to create first your view controllers associated to each tabBar button (like you have been doing until now), after, add these view controllers to your tabBar and then present the tabBarController modally. Like this:
FirstViewController *fvc = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
fvc.userSelectedLatitude = saveLatitude;
fvc.userSelectedLongitude = saveLongtitude;
UITabBarController *tabControl = [[UITabBarController alloc] init];
[tabControl setViewControllers:[NSArray arrayWithObjects:fvc, nil]];
[tabControl setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
[self presentModalViewController:tabControl animated:NO];
I think this code should work. So, try it and tell us if something goes wrong.
With UITabBarController, there is no need to manually present viewControllers or call code to switch the views. This is handled for you.
All you need to do is set the viewControllers property of the UITabBarController. Like so:
[tabBarController setViewControllers:[NSArray arrayWithObjects:view1, view2, nil]];
current version of my project :
I have 5 different UIViewControllers in my app. I've set my
FirstViewController to be the Initial View Controller using the
Attributes Inspector. I move back and forth from one ViewController to
another by using buttons to which I assign modal segues, from one
ViewController to another, using the StoryBoard
What I want to change:
I want to keep the navigation buttons obviously, delete the modal segues and use
a UINavigationController instead. If I understand the concept
correctly, when using a UINavigationController I need to go into each
UIButton-IBAction and at the very end of the method I have to push the next
ViewController I want to move to, onto my NavigationController (do I also
have to pop the current one first?). However, I can't figure out how
to implement all that correctly.
What I've done so far:
I removed all modal segues from the storyboard and kept the navigation buttons along with their corresponding IBActions
I unchecked the box in the Attributes Inspector that was making my FirstViewController the initial View Controller of my app
I went into my AppDelegate.m and tried to create the Navigation Controller there and make my FirstViewController be the RootViewController
MyAppDelegate.m
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UIViewController *myFirstViewController = [[FirstViewController alloc] init];
UINavigationController *myNavigationController = [[UINavigationController alloc] initWithRootViewController:myFirstViewController];
[myNavigationController pushViewController:myFirstViewController animated:YES];
// Override point for customization after application launch.
return YES;
}
I then tried to test if the above was working by going into the IBAction of a
navigation button on my FirstViewController and implemented the
following in order to move to my SecondViewController when the
button is pressed :
FirstViewController.m
- (IBAction)goRightButton:(UIButton *)sender
{
// some code drawing the ButtonIsPressed UIImageView on the current View Controller
UIViewController *mySecondViewController = [[SecondViewController alloc] init];
[self.navigationController pushViewController:mySecondViewController animated:YES];
}
but nothing happens. What am I doing wrong ?
You are not linking your XIB file. Please add your navigation controller as
UIViewController *myFirstViewController = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:myFirstViewController];
Use following code to move from one view to another
UIViewController *mySecondViewController = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
[self.navigationController pushViewController:mySecondViewController animated:YES];
If you are using a storyboard, you should just drag in the navigation controller there and hook it up to your app delegates. As long as it is the main storyboard, and you have identified a view controller to load first, you do not need to load any views in your app delegate.
In order to push a view programmatically that's in a storyboard, you need to do something like the following:
//bundle can be nil if in main bundle, which is default
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
MyCustomViewController *customVC = (MyCustomViewController *)[mainStoryboard instantiateViewControllerWithIdentifier:#"customVC"];
//standard way
[self.navigationController pushViewController:customVC animated:YES];
//custom animation
[UIView transitionWithView:self.navigationController.view duration:0.5 options:UIViewAnimationOptionTransitionCurlUp animations:^{
[self.navigationController pushViewController:customVC animated:NO];
} completion:nil];
You identify the view controller with the identifier you add in the storyboard editor. Below are some screenshots to help show what I mean.
I want to use a UIPopoverController in my application and was trying this example. The problem is that the view and the controller in that example are created from code.
UIViewController* popoverContent = [[UIViewController alloc]
init];
UIView* popoverView = [[UIView alloc]
initWithFrame:CGRectMake(0, 0, 200, 300)];
popoverView.backgroundColor = [UIColor greenColor];
popoverContent.view = popoverView;
I want to use an existing controller with it's xib file for the popup. How do I link the popup to an existing controller? And do I need to create the controller's view in some special way for it to match the dimension of the popup?
Yes you can:
MyUIViewController* content = [[MyUIViewController alloc] initWithNibName:#"myNib" bundle: nil];
// additional initialization in loadView
UIPopoverController* aPopover = [[UIPopoverController alloc]
initWithContentViewController:content];
If you want to use an existing xib, just initialize your viewController using the nitWithNibName:bundle: method. When you init using the xib your viewController's view hierarchy will be instantiated for you.
UIViewController* popoverContent = [[UIViewController alloc] initWithNibName:#"yourXibName" bundle:nil];
Don't worry about sizing the view when you initialize - the view gets resized in the example code you cite anyway on the next line when the property contentSizeForViewInPopover is set.
I've got a UITabBarController which contains a UINavigationController. Within the visible UIViewController, I'm creating a UITableView programatically as follows:
self.voucherTableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame] style:UITableViewStylePlain];
self.voucherTableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
However, the UITabBar is overlapping the UITableView.
When I output the height of the [[UIScreen mainScreen] applicationFrame], it returns 460.00 whereas it should be 367.00.
In Interface Builder, I'm using the 'Simulated Metrics' which automatically sets the height of the view to 367.00.
Is there something I'm missing, no matter what I try I can't see to get the 367.00 height that I need.
As a temp fix, I've set the frame of the UITableView manually, this isn't really ideal so it would be nice to work out why this isn't working:
self.voucherTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 367) style:UITableViewStylePlain];
You should use self.view.bounds rather than [[UIScreen mainScreen] applicationFrame] as the last one returns you the whole screen frame while self.view.bounds provides you with your view bounds wich seems what you are searching for.
You should add the UINavigationController instance to the UITabBarController and then add a table view controller to the rootViewController property of the UINavigationController instance which should make your life a lot easier.
As a simple example of this, create an empty window-based application (the templates make this a lot more confusing than it really is).
Add your UIViewController/UITableViewController subclasses to the project then use this code as a guide to setting up your project. This code is in your AppDelegate class:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// create our table view controller that will display our store list
StoresViewController *storeListController = [[StoresViewController alloc] init];
// create the navigation controller that will hold our store list and detail view controllers and set the store list as the root view controller
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:storeListController];
[navController.tabBarItem setTitle:#"TableView"];
[navController.tabBarItem setImage:[UIImage imageNamed:#"cart.png"]];
// create our browser view controller
BrowserViewController *webBrowserController = [[BrowserViewController alloc] init];
[webBrowserController.tabBarItem setTitle:#"WebView"];
[webBrowserController.tabBarItem setImage:[UIImage imageNamed:#"web.png"]];
// add our view controllers to an array, which will retain them
NSArray *viewControllers = [NSArray arrayWithObjects:navController, webBrowserController, nil];
// release these since they are now retained
[navController release];
[storeListController release];
[webBrowserController release];
// add our array of controllers to the tab bar controller
UITabBarController *tabBarController = [[UITabBarController alloc] init];
[tabBarController setViewControllers:viewControllers];
// set the tab bar controller as our root view controller
[self.window setRootViewController:tabBarController];
// we can release this now since the window is retaining it
[tabBarController release];
[self.window makeKeyAndVisible];
return YES;
}
In the code sample above the BrowserViewController is a subclass of UIViewController and the StoresViewController class is a subclass of UITableViewController. The UITabBarController and UINavigationController instances are created programmatically and added to the window.
By subclassing the UITableViewController class you avoid having to create a UITableView instance programmatically and get most everything you need out of the box.
When you need to push a detail view onto the UINavigationController instance's stack, you just have use something similar to this:
[self.navigationController pushViewController:YourDetailViewControllerInstance animated:YES];
This will add the detail view UIViewController subclass to the UINavigationController instance's view hierarchy for you and animate the transition.
Lots of controllers in this, but it's totally worth it and will avoid a lot of the problems you're experiencing as this method allows the views to manage resizing and take toolbars/navigation bars into account all by themselves.
I understand modal views cover the entire screen. But I really want a view that covers only half the screen just like the keyboard. So, please tell me why this doesn't work
MyController *controller = [[MyController alloc] initWithNibName:#"MyView" bundle:nil];
CGRect frame = CGRectMake(0,44,768,264);
[controller view].frame = frame;
contoller.delegate = self;
[[self view] addSubView:[controller view]];
[controller release];
I am trying to add a sub view to my current view and make it appear where the keyboard appears.
It throws a BAD ACCESS exception
In my code (above), I was using a custom UIViewController with it's own view [set to UIView on IB]. I couldn't get it to work by setting frame for the view controller's view.
So I added a custom UIView without a Nib file with all the controls (buttons, textfields) added on initWithFrame.
MyCustomView = [[MyCustomView] alloc] initWithFrame:frame delegate:self];
[self.view addSubView:MyCustomView];
Thanks for your comment, Jacob.