Re: Responder Chain Patching

[Jonathan Dann]

Have you seen this

http://katidev.com/blog/2008/04/17/nsviewcontroller-the-new-c-in-mvc-pt-2-of-3/

and this thread

http://www.cocoabuilder.com/archive/message/cocoa/2008/3/19/201743

All of this is covered, with automatic insertion of view controllers into the responder chain. If you want to set up the view controller as the next responder of the view (not done in the above) then you might be better with this code (thanks, Ali Lalani)

#import "MyViewController.h"


@implementation MyViewController
- (void)loadView;
{
    [super loadView];


}

- (void)dealloc;
{
    [[self view] removeObserver:self forKeyPath:@"nextResponder"];
    [super dealloc];
}

{
    if ([keyPath isEqualToString:@"nextResponder"])
    {

        if ([[self view] nextResponder] != self)
        {
            [self setNextResponder:[[self view] nextResponder]];
            [[self view] setNextResponder:self];
        }
    }
    else
    {

    }
}
@end

[[self view] addObserver:self forKeyPath:@"nextResponder" options:0 context:NULL]; - (void)observeValueForKeyPath:(NSString *)keyPath ofObject: (id)object change:(NSDictionary *)change context:(void *)context // when we get called due to setting next responder as ourselves we ignore it (could also unobserve right before and re- observe right after...) [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];

HTH

Jon

In this way the view controller will 'jump' in whenever the view's nextResponder is set.

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