I have tried this for past few days and have not got any success yet.
I am loading various XML Data once the application is launched. But currently I have not loaded any loading page to show the loading of the page. I would like to add a page which shows loading of my data and then push that loading view page to the tab bar controller page.
Does anyone have any example or any idea to share it, will be really helpful.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions {
[navController.navigationBar setTintColor:[UIColor blackColor]];
LoadingViewController *lvc = [[LoadingViewController alloc] initWithNibName:#"LoadingView" bundle:nil];
// Adding the modal view controller to loading View controller on Main Tab bar controller. Hope its correct
[self.rootController presentModalViewController:lvc animated:YES];
[window addSubview:rootController.view];
[window makeKeyAndVisible];
[self URL];
[lvc release];
return TRUE;
}
There are lots of ways to do something like this. One option is to create a viewcontroller that shows your loading view. add your tab bar controller to the window. Then present the loading view controller as a modal view controller over the tab bar controller. Then start your xml parsing, and dismiss the modal controller when the parsing is finished.
Related
Hihi all,
This could very well be a silly question. I would like to navigate to my "Login View" upon the launching of my application. My current tries:
In my first UIViewController's viewDidAppear method, perform a [self presentModalViewController:LoginView animated:YES], this works, but the screen shows my main UIView first, then slide my LoginView from bottom to top. I can't find a way to perform it without the animation.
In my first UIViewController's viewDidAppear method, perform a [self.view addSubview:LoginView.view], it ends up with exc_bad_access error.
Basically, my requirement is to perform certain checks upon starting of the application, if a login is required, the application shall display the LoginView, otherwise, it should stay as my main UIView.
Please advice what is the best way of achieving this, instead of the above two silly methods. Thanks in advance!
:)
How about trying it in **- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {**
example :
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
LoginViewController *aLoginViewController = [[LoginViewController alloc] init];
[self.navigationController presentModalViewController:aLoginViewController animated:NO];
[aLoginViewController release];
return YES;
}
your 1st step is a good way..
but to stop animation, its very simple. Set animated to NO.
[self presentModalViewController:aLoginViewController animated:NO];
once ur done with ur validation, just dismiss this aLoginViewController.
Instead of -viewDidAppear, it sounds like you want to use -viewWillAppear:, which will allow you to present your login controller before the initial view is displayed.
-presentModalViewController:animated is the right method to display your login controller's view.
I am using a tab based application that shows a presentModalViewController called "overview" that has 2 buttons on it .
In order to call it I am using the following code in app delegate:
Overview *overview = [[Overview alloc] initWithNibName:#"Overview" bundle:nil];
[self.tabBarController presentModalViewController:overview animated:YES];
When overview shows up, it has a button called that gets clicked and I am using the following code:
-(IBAction) btnLoginPressed{
[self dismissModalViewControllerAnimated:YES]; //get rid of view
Login *login = [[Login alloc] initWithNibName:#"Login" bundle:nil];
[self.tabBarController presentModalViewController:login animated:YES];
[login release];
}
However the login prsentModalViewController never shows up. Can someone explain why and what I can do to show it?
Thanks
When you present a modal view controller, you do it from the view controller currently in the view.
Assuming your second modal display of a view controller is happening in Overview.m change your code to the following:
-(IBAction) btnLoginPressed {
Login *login = [[Login alloc] initWithNibName:#"Login" bundle:nil];
[self presentModalViewController:login animated:YES];
[login release];
}
You don't need to dismiss Overview first, and in fact you shouldn't as it the animations won't work in conjunction with each other.
When you ultimately dismiss login (or however deep you want to go), you send dismissModalViewController:animated: as high up as you need to. To get back to the tab bar's controller use:
[self.tabBarController dismissModalViewController:animated]
It would be well beyond the scope of your question and the time I have to answer but you should take some time and really study the docs on implementing View Controllers. I definitely recommend following Apple's code style guidelines as one suggestion to make your code much more readable (e.g. overviewViewController vs overview). It's also clear you're just learning so keep at it.
In an application I'm developing, everything starts from a navigation controller, which then loads up several pages.
My question is, how can I load up a new view ABOVE this? The closest I've got is to do this in the App Delegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self checkAndCreateDatabase];
[self readDataFromDatabase];
[window addSubview:[navigationController view]];
// Add this
[window addSubview:[newViewController view]];
[window makeKeyAndVisible];
return YES;
}
However this will load the view half way across the screen with no way of having it start at (0,0). Do anyone have a better suggestion?
Thanks
You can show regular views on top of everything by showing it as a modal view. Here is a sample project. http://dl.dropbox.com/u/3656129/ModalViewExample.zip
I have an iPhone application that I am currently converting to a universal binary to work with the iPad. I have successfully implemented everything I need in terms of layout so that full landscape functionality is now supported in my app (previously I primarily used portrait mode to display content).
But, I have one strange problem, and it ONLY occurs in landscape mode: when I push a view controller onto the stack, it takes two taps on the back button to return to the previous view controller! The first tap shows a blank view, but with the same name on the left-side back navigation button, the second tap takes the controller back to previous view like it should.
I don't have an iPad to test, so I am relying on the simulator. The problem does not show up on the iPhone and doesn't show up if you rotate back to portrait mode.
My app consists of a tabbarcontroller with navigation controllers loaded for its vc's:
//application delegate
- (void)applicationDidFinishLaunching:(UIApplication *)application
//....
WebHelpViewController *vc8 = [[WebHelpViewController alloc] init];
UINavigationController *nv8 = [[UINavigationController alloc] initWithRootViewController:vc8];
[self.tabBarController setViewControllers:[NSArray arrayWithObjects:nv1,nv2,nv3,nv4,nv5,nv6,nv7,nv8,nil]];
To implement landscape capability, the UITabBarController is overridden to autorotate when required:
//CustomTabBarController.m
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return [[(UINavigationController *)self.selectedViewController topViewController] shouldAutorotateToInterfaceOrientation:interfaceOrientation];
}
... works fine. I navigate into new views using this method
SomeViewController *vc = [[SomeViewController alloc] init];
[self.navigationController pushViewController:vc animated:YES];
[vc release];
Is this only a simulation error? How do I fix this problem?
It sounds like another ViewController is responding to:
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
Check this first.
I am developing a Window Based app for iPhone. I use Interface Builder to build Interface. I want to call a new screen with a Button Action. How can I call the screen with Button action ?
By pushing the new controller onto the top of the stack of windows. For example:
EnterNameController *newEnterNameController = [[EnterNameController alloc] initWithNibName:#"EnterName" bundle:[NSBundle mainBundle]];
[[self navigationController] pushViewController:newEnterNameController animated:YES];
Apple has an extraordinary amount of sample code, and this question (as well as many others) could easily be solved by simply visiting Apple's iPhone dev site.
iPhone Dev Site
If you are using a navigation controller, push it onto the navigation controller's stack, as alamodey suggested.
If you want it to be a modal controller (that is, slide up from the bottom and cover the previous controller's view, like the Bookmarks screen in Safari), present it as a modal view controller:
[self presentModalViewController:myNewController animated:YES];
When you want to bring the old controller back, dismiss the modal view controller. From inside the modal view controller:
[self.parentViewController dismissModalViewControllerAnimated:YES];
If you don't want to do either, just remove the current controller's view from the window and add the new controller's:
UIView * containingView = self.view.superview;
[self.view removeFromSuperview];
[containingView addSubview:myNewController.view];
If you go this route, you may want to look into +[UIView beginAnimations:context:], +[UIView setAnimationTransition:onView:], and +[UIView commitAnimations] (if I recall the method names correctly--check the documentation) to animate the transition. You should almost always animate any switch between screens in iPhone OS.
(work in .m class)
#import "classtocall.h"
- (IBAction)ButtonPressed:(id)sender
{
classtocall *mvc = [[classtocall alloc]initWithNibName:#"classtocall" bundle:nil];
[self presentModalViewController:mvc animated:NO];
}
(for window based application)
define in .h class
- (IBAction)ButtonPressed:(id)sender;
where "classtocall" is the class you want to call.
you just need to download sample applications from XCode help. Try Elements and UIcatalog. There are also other - type 'pushViewController' or 'addSubview' adn 'makeKeyAndVisible' in help and download samples
nextscreenViewController *login = [[self storyboard] instantiateViewControllerWithIdentifier:#"nextscreenidentifier"];
nextscreenidentifier.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController: nextscreenidentifier animated: YES];