So I've got one main view with some images on it, and when someone touches one of the images, the image will return an ID number to this main view and then this view will present a modal view controller to display a larger version of this image. But the current way I'm doing it, the function on the modal controller is getting there before the NIB is loaded or something, because when (in that function) i tell it to change the text of some IB labels they are NULL. However, when I, say, press a button that calls a function to do the same it does it just fine. Here's what I'm doing now:
What is the best way to send data to a modal view controller while presenting it? Thanks so much!
- (void)photoViewWasTouchedWithID:(int)imgID {
[self presentModalViewController:singlePhotoView animated:YES];
[singlePhotoView showImageWithID:imgID];
}
Instead of doing the view object manipulation in showImageWithID:, store the parameter into a member variable. Then do your setup work in viewWillAppear, and your view objects should be instantiated.
Related
I'm creating an app using the iPhone Utility App framework, and I'm trying to use a navigation controller on the flipside view, as there will be a lot of drilldown options on this view. When I'm done with this view, I call the following code:
- (IBAction)done:(id)sender
{
[self dismissModalViewControllerAnimated:YES];
}
When I dismiss this view, I want to be able to go back to the place in the navigation I was currently at when I reopen this view again. However, when I dismiss this view using this method, the vc gets deallocated, therefore the menu starts back at the beginning when I try to go back to the menu.
Thoughts?
You'll need to retain a reference to the object (I'm calling it the options controller). I would say the easiest way is to create an iVar in the presenting view controller that references the options controller. Then, when you go to present the options controller again, just present the referenced options controller rather than creating a new controller. If different view controller objects can present the options controller, you'll need to either pass that reference around, or store it in some object that all the other view controllers have access to.
Hmm not much code so maybe I'm misunderstanding your setup, but...
You could use the AppDelegate to store (as a property) your current position (index) in the views collection of the Navigation controller, and then write a method that pushes to that (stored) position when you re-visit it later.
Might be an easier way to do it though..
So what you want is to flip from a view to another view? If you want to keep the navigation bar status between flipping, I recommend you use only one view controller to control this 2 views. you can use + transitionFromView:toView:duration:options:completion: of UIView to flip views.
I have created an application with multiple views. I have my main view (ViewController.h) and a couple of other views.
The way I call the other views is by presenting modal view and then I go back by dismissing the modal view. Therefore the main view does not close, it stays in the background.
Now, I have a function in one of the "secondary" views that should affect the font size of the primary view. But I cannot find a way to refresh the primary view once I close the secondary view. The font size is saved into a global variable, therefore after I close the secondary view that global variable has a new value and I want this new value to be my font size.
Therefore, I would like to reload the primary view. How can I do that? my button for going back to the primary view has the following code
-(IBAction)goBack
{
[self dismissModalViewControllerAnimated:YES];
}
Can anybody help me on that?
Thanks a lot guys
the viewWillAppear method will always be called when you go from second view to first view... try implementing the changes in this method...
might want to try calling [view setNeedsDisplay] after the modal view controller is dismissed.
I have a main controller, and a popover that gets presented from the main controller. My main controller passes an array to my popover. In my viewDidLoad of my popover controller, I take that array, get the image and text data for that entry and put it into an NSDictionary. I do this because I need to resize my pictures for my UITableView to be presented in the popover. It works fine, however, since I now have an NSArray of NSDictionary in my popover, every time I bring up my popover, since this code is in the viewDidLoad, it gets created each time. It seems like an expensive operation since there is a bit of lag in presenting the popover to begin with. Is there a way I can cache the data somewhere once it's loaded once? Thanks.
Couldn't you create it in your main controller and pass it as a parameter to your popover?
My app has a welcome screen that can only be shown in portrait mode. After the user has tapped through the welcome screen I'd like to show another screen that can be used in both portrait mode and landscape.
I have set up a view controller that implements shouldAutorotateToInterfaceOrientation: returning YES only for UIInterfaceOrientationPortrait, and I add the view to the window with [window addSubView:view]. I tag this view with the tag 1.
When the user taps through the welcome view and the app moves on to the new view I do:
[[window viewWithTag:1] removeFromSuperView];
[window addSubView:myViewController.view];
Where myViewController is an instance of the 2nd view's view controller (that handles the shouldAutorotateToInterfceOrientation method properly).
Now when I rotate, it still calls shouldAutorotateToInterfceOrientation on the original view's view controller, and does not call it on the new view's view controller.
This note from Apple says that only one view controller will get rotation notifications; however, I have removed the other view controller.
What am I doing wrong?
actually that note doesn't say that "only one view controller will get the notifications" but instead it says that "Only the first view controller added to UIWindow will rotate.".
So this might be the problem.
To resolve it, i would say to always have a view added to your window (call it permanent), and add your welcome screen and the next views to this permanent view.
Hope this helps.
as the note you link to state:
Only the first view controller added
to UIWindow will rotate.
So put a flag that makes sure that shouldAutorotateToInterfceOrientation returns NO until the user have dismissed the screen - and then returns YES afterwards. This is a simple and working solution - however, from a code readability point it might be confusing that a "dismissed" view actually controll the rotation.
Personally; my experience is that it's not really worthwhile having some views rotating and some don't - and users tend to don't like it.
happy coding
I wrote up a quick test that shows what you are trying to do should work. Here are the basics I did:
Create two view controllers. App starts with the first view controller being set in the AppDelegate into an instance variable viewController through NIB files. It is then added to the window as you have written.
I then setup an action that when called (could be a Timer, button on first view controller, etc.) that performed the following:
Remove view using [self.viewController removeFromSuperview]. This is different than the way you have done with the tag.
Created second view controller and assigned it to self.viewController.
Added to window like you have specified.
Not sure what is incorrect with your code. I would guess that perhaps the first view wasn't really being removed.
I am Using a Navigation based application.
However i don't want to push a view.
I have changed present ModalViewController.
Now, I am confused - how to load previouse view.
My Application's Table View - default in navigation base application
On navigation controller I have added (add employee) button.
On Add(employee) click i have written following code in appDelegate.m
-(IBAction)AddClicked:(id)sender
{
if(self.addData==nil) // addData is a object of my next view
{
addData=[[AddEmpScrn alloc] initWithNibName:#"AddEmpScrn" bundle:nil] autorelease];
}
[self.navigationController presentModalViewController:self.addData animated:YES];
}
This code works successfully & next Add Employee screen load perfactly.
But Now I am confused.
How to get back to previous view?
that is if a user click on "Save" or "Cancel"
it should display again the previous view...
main screen
I dont know how to solve it...
anybody please help me...
i will be thank full.
Have u tried using the dismissModalViewController method? should do what you are asking f or
Have you read "Using Modal View Controllers"?
If you presentModalViewController then the old view is still there "behind" it. You just need to call dismissModalViewControllerAnimated: on the original navigation controller.
If you are directly manipulating the view hierarchy by swapping out subviews, you will need to hold onto the old view in another member variable and make sure to retain it.