CODEWITHSUNDEEP
objective-cmacoscocoanswindowcontroller
whtlnv
whtlnv

Reputation: 2207

NSWindowController awakeFromNib is being called twice

I have an application that intends to create a popup window when a button is clicked. The popup window will load from a nib file. And so, the button is clicked and the window happily pops up. BUT, its awakeFromNib method gets called twice. Here's the code;

Application Delegate:

...

-(IBAction)myButton:(id)sender{

    printf("[settings]: button pressed\n");

    Config_SelectorSetup *selectorSetup = [[Config_SelectorSetup alloc] initWithWindowNibName:@"Config_SelectorSetup"];

    printf("about to load\n");

    [[selectorSetup window] makeKeyAndOrderFront:sender];

}

Config_SelectorSetup.m

- (id) initWithWindowNibName:(NSString *)windowNibName{

    printf("[initWithWindowNibName]\n");

    if( self = [super initWithWindowNibName:windowNibName] ){

        ...

    }

    return self;

}

- (void)awakeFromNib{

    printf("[awakeFromNib]\n");

    [self startScreen];
}

And here is the output:

[settings]: button pressed
[initWithWindowNibName]
about to load
[awakeFromNib]
[awakeFromNib]

Analyzing the call stack, first time it's called by [NSObject performSelector:] the second one by [NSIBObjectData nibInstantiateWithOwner:topLevelObjects:].

Can someone tell what am I doing wrong?

Thanks

Upvotes: 1

Views: 1191

Answers (3)

w0mbat
w0mbat

Reputation: 2459

If you create an object from a nib and specify the NSWindowController as the owner, the window controller will get an awakeFromNib. For example, a common case is where the controller is a delegate for an NSTableView and the method

(NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row

is making the views like this,

return [tableView makeViewWithIdentifier:tableColumn.identifier
                                                      owner:self];

Note how self (the window controller) is passed as owner, which will cause it to see an awakeFromNib message every time this line is executed. In this case it's better to pass nil as the owner, and not rely on getting awakeFromNib for table cell views here.

I don't know what object is being created with your controller specified as the owner in your case, but this should put you on the right track.

Upvotes: 1

Gobot
Gobot

Reputation: 2480

How many outlets do you have in your class and what is that class subclassing? I found with certain subclasses (NSDocument for instance), if you have multiple outlets connected, each nib object will fire the awakeFromNib method upon loading. NSLog your outlets to see if they output nil or an address.

Upvotes: 1

rob mayoff
rob mayoff

Reputation: 385500

Does Config_SelectorSetup.xib contain a Config_SelectorSetup object besides File's Owner?

Try logging self in awakeFromNib -

NSLog(@"self = %p", self);

Does it print the same address each time? If it's printing different addresses, chances are you have a Config_SelectorSetup object in your nib.

Upvotes: 3

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