Question

I am working with a split view controller with a master and detail view. I have a view on my detail view controller that contains a user input field which should call a method on the master view controller to update an array. I am having trouble setting up the communication between the two sides. I have tried to simply call that method using [masterViewController updateCalcs], but that doesnt seem to work and errors out with the below:

 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-
[UINavigationController updateCalcs]: unrecognized selector sent to instance 0xb08d130'

Can anyone help me out by some sample code or a source to explain how exactly to call a method on one view from the other?

Answer 1

The best practice is to use delegates. In your detailview.h add:

@protocol TestDelegate <NSObject>
-(void)doSomeThing;
@end

@property (nonatomic, weak) id <TestDelegate> delegate;

In detailview.m:

[self.delegate doSomeThing];

In masterview.m after the detailview is created add:

detailView.delegate = self;

In masterview.h add the delegate like:

@interface MasterView : UIViewController <TestDelegate> {