calling a parent view's method from a subview

[Journer]

See 4th post

I'm working with a multiple view application. I have a view switching class that handles all the removing and adding of content views to the main window. This work perfectly when linking buttons in the main window view (whose class is the switching class) to the functions in the switching class. However, sometimes I need to call these functions (functions add/remove subviews so they can be displayed) from within a content view (subview). I've tried a lot of different things, but I can't seem to get anything to work.

Creating pointer to the swtich class doesnt work:

//content view class m file
doSomething{
viewSwitcher *v = [[viewSwitcher alloc] init];
[v switchView];

swtichView being the function I want to call. It is (and must be) an instance method ( - ).

I've read about delegates, but can't find any tutorials that are helpful.

Any ideas?

[Tambourin]

MyMainView *myMainView = (MyMainView *)self.superview;
[myMainView switchView];

[Journer]

Originally Posted by Tambourin

MyMainView *myMainView = (MyMainView *)self.superview;
[myMainView switchView];

tried this. got this error:

MainMenuViewController.m:18: error: request for member 'superview' in something not a structure or union

[Journer]

//SwitchViewController.h

#import <UIKit/UIKit.h>
@class MainMenuViewController;
@class GlassRepairsViewController;

@interface SwitchViewController : UIViewController {
	MainMenuViewController *mainMenuViewController;
	GlassRepairsViewController *glassRepairsViewController;

}


@property (retain,nonatomic) MainMenuViewController *mainMenuViewController;
@property (retain,nonatomic) GlassRepairsViewController *glassRepairsViewController;

-(IBAction)goToGlassRepairs;
-(IBAction)goToMainMenu;

@end

//switch view controller m file

#import "SwitchViewController.h"
#import "MainMenuViewController.h"
#import "GlassRepairsViewController.h"


@implementation SwitchViewController
@synthesize MainMenuViewController;
@synthesize GlassRepairsViewController;

- (void)viewDidLoad {
	MainMenuViewController *mainMenuController = [[MainMenuViewController alloc] initWithNibName:@"MainMenuView" bundle:nil];
	self.mainMenuViewController = mainMenuController;
	[self.view insertSubview:mainMenuController.view atIndex:0];
	[mainMenuController release];
    [super viewDidLoad];
}
//These IBActions are linked to buttons on the view that is linked to this class (swtichViewController)  This works perfectly for showing different nibs

-(IBAction) goToGlassRepairs
{
	if(self.glassRepairsViewController.view.superview == nil)
	{
		if(self.glassRepairsViewController == nil)		
		{
			GlassRepairsViewController *glassRepairsController = [[GlassRepairsViewController alloc] initWithNibName:@"GlassRepairsView" bundle:nil];
			self.GlassRepairsViewController =glassRepairsController;
			[glassRepairsController release];		
		}
		[mainMenuViewController.view removeFromSuperview];
		[self.view insertSubview:glassRepairsViewController.view atIndex:0];	
	}	
}

-(IBAction) goToMainMenu
{
	if(self.mainMenuViewController.view.superview == nil)
	{
		if(self.mainMenuViewController == nil)		
		{
			 MainMenuViewController *mainMenuController = [[ MainMenuViewController alloc] initWithNibName:@"MainMenuView" bundle:nil];
			self.mainMenuViewController = mainMenuController;
			[mainMenuController release];		
		}
		[glassRepairsViewController.view removeFromSuperview];
		[self.view insertSubview:mainMenuViewController.view atIndex:0];	
	}	
	
}

//MainMenuViewController.h

#import <UIKit/UIKit.h>

@class SwitchViewController;


@interface MainMenuViewController : UIViewController {

}

-(IBAction)goToGlass;


@end

//MainMenuViewController.m

#import "MainMenuViewController.h"
#import "SwitchViewController.h"


@implementation MainMenuViewController


-(IBAction)goToGlass
{
  //This is where I want to call the goToGlassRepairs method that is inside SwitchViewController's class...

	SwitchViewController *switch= (SwitchViewController *)self.superview;
	[switch goToGlassRepairs];	
	
}

SwitchViewController is the class that handles which nibs to display and remove.
MainMenu and glassRepairs are content views. However, MainMenu needs to access the methods in the switchviewcontroller class to allow navigation from the content view.

[coconnor]

If you are going back to the parent view controller why don't you just pop or dismiss the second controller as in

[self.navigationController popViewControllerAnimated:YES];

or

[self dismissModalViewControllerAnimated:YES];

Good luck
Cheryl

[Journer]

I tried this:

SwitchViewController *s = (SwitchViewController *)[[UIApplication sharedApplication] delegate];
	
[s goToGlassRepairs];

and it compiles with no warnings. however, when you click the button linked to this method, it crashes with the following errors:

[29535:207] *** -[GoAppDelegate goToGlassRepairs]: unrecognized selector sent to instance 0x3b26620

[29535:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '***

-[GoAppDelegate goToGlassRepairs]: unrecognized selector sent to instance 0x3b26620'

.....

[Journer]

Originally Posted by coconnor

If you are going back to the parent view controller why don't you just pop or dismiss the second controller as in

[self.navigationController popViewControllerAnimated:YES];

or

[self dismissModalViewControllerAnimated:YES];

Good luck
Cheryl

not really sure what you are talking about, but I tried the above code. It compiles, but nothing happens when I click the button linked to the method I put this in.

[harrytheshark]

That's because your SwitchViewController isn't your app delegate.

[Journer]

ok, even when I try:

switchViewController *s = [[SwitchViewController alloc] init];
[s goToGlassRepair];

it gives me warnings saying s may not respond to goToGlassRepair

[Journer]

finally got this to work:

what I did was added a function in the app delegate that called the display function in the switchview controller. then i imported the app delegate into my main menu and made a function that called the app delegate's function.