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EDIT2: I try to summarize my problem and the solutions:

I've got a TableViewController named DetailedViewController. My intention was to activate TouchesBegan to recognize actions like sliding etc, and normally, the method touchesbegan is replaced with the DidSelectRow method. In many posts on stackoverflow, subclassing the UITableView is the only possibility to realize this.

So i created a SpecificTable with .xib file and i used this as a subclass of UITableViewController by adding the SpecificTable as the nib-file. Selecting a row works fine, and also the TouchesBegan method (i called a method IN the SpecificTable.m with an Alert.) But now i want to call a Method in the UITableViewController (DetailedViewController) where moveToNextItem is declared like

 -(void)moveToNextItem:(id)sender { [self.navigationController pushViewController:bbarChart animated:YES]; }

But by calling this method with [self moveToNextItem] the App crashes by touching. (in the Debugger-Mode, the App crashes in the line of [self moveToNextItem]. What is the right way to call the method of DetailedViewController.m?

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4 Answers 4

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Update: You should probably subclass UITableViewCell rather than UITableView. Then in your table view controller's cellForRowAtIndexPath: method, return an instance of this subclass rather than an instance of UITableViewCell.

You will also need to pass a DetailedViewController pointer on to the cell, so that you can invoke its moveToNextItem method in the touchesBegan, etc. methods.

Adapt this example to your needs:

MyTableViewCell.h

@class DetailedViewController; @interface MyTableViewCell : UITableViewCell { DetailedViewController *dvc; } @property (nonatomic, retain) DetailedViewController *dvc; @end

MyTableViewCell.m

#import "MyTableViewCell.h" #import "DetailedViewController.h" @implementation MyTableViewCell @synthesize dvc; - (void)someMethod { // This would be your touchesBegan, etc. methods [dvc moveToNextItem]; } - (void)dealloc { [dvc release]; // We retained dvc so we have to release it when we're done with it [super dealloc]; } @end

DetailedViewController.h

@interface DetailedViewController : UITableViewController { // iVars here } // Methods and properties here - (void)moveToNextItem; @end

DetailedViewController.m

#import "DetailedViewController.h" #import "MyTableViewCell.h" @implementation DetailedViewController - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { MyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MyTableViewCell"]; if(cell == nil) { cell = [[[MyTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"MyTableViewCell"] autorelease]; cell.dvc = self; // This gives the cell a reference to the detailed view controller } return cell; } - (void)moveToNextItem { // ... } @end

There are probably far better ways to achieve what you want, but this is the best I can do without more information.

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10 Comments

+1 precise :), would not it be good to explanation of WHY as well?
sry, this doesn't work, i also thought that this would works.
This does work, and it how you do what you say you are trying to do. Post your code, because either you have a strange error somewhere, or you are trying to something other than what you describe.
Ok, i try to write all connections... In the IB, i've got a UITableViewController named DetailedViewController, an the NIB File is the SpecificTable, a new class containing ".h, .m, .xib" In This Class, i overwrite the TouchesBegan, TouchesMoved etc methods including this in the TouchesMoved method: if (mystartTouchPosition.x < currentTouchPosition.x) { isProcessingListMove = YES; [self moveToNextItem]; return; } In The Implementation File of the UITableViewController (DetailedViewController) i added the method like i posted in my Edit-Party of my question.
oh, sry, i always forgot to write the error, sry. First, there is a warning named "'SpecificTable' may not respond to '-moveToNextItem'" and if i call the method (by touching) the App crashes..
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Declare the method in DetailedViewController.h, and @import that file in SpecificTable.h.

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sry, but this doesn't work. I tried this even before i asked.
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if SpecificTable is really a subclass of DetailedViewController you can call 

[self moveToNextItem];

as already mentioned.

but i think you mean a subview or not? so SpecificTable.view is a subview ob DetailedViewController.view

you have several options then. for example using NSNotificationCenter.

or what is probably also a good way for you is to setup an instance variable of DetailedViewController in your SpecificTable and assign it when you init your SpecificTable.

as an example:

// the parent view .m testTVC *tableview = [[testTVC alloc] initsomething]; tableview.parentVC = self; [self.view addSubView:tableview.view]; [tableview release];

now in your testTVC

// the .h @interface testTVC : UITableViewController { testVC *parentVC; } @property(nonatomic,retain) testVC *parentVC; @end // the .m [parentVC moveToNextItem];

you also have to synthesize and release your parentVC.

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Thank you a lot, but i'm very sure that i mean subclass. So i've got an UITableViewController named DetailedViewController and there i declared the tableView. In The IB, the NIB is the subclass, SpecificTable (type:UITableView) and there the tableView is declared. (I used this to enable TouchesBegan and so on in the TableViewCell).
so you have to provide us more code and/or the way your stuff is conneted in IB. normally [self moveToNextItem]; should work.
i posted the connection in the IB under the answer of robinjam, i hope that can help, otherwise ask, thank you.
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Is [NSNotificationCenter defaultCenter] something you are looking for?

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I'm not really sure how this relates to the question. Care to elaborate?
To communicate between two different view controller, sometimes there is no convenient way to access to another view controller's instance / methods. One way to communicate is to broadcast a notification, other interested view controller can subscribe/listen to such notifications. I don't understand why my answer is down-voted. Down-voter please explain.

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