Re: Allocating outlets from NIB file
Re: Allocating outlets from NIB file
- Subject: Re: Allocating outlets from NIB file
- From: Johan Kool <email@hidden>
- Date: Tue, 24 Jun 2008 14:43:29 +0200
You do not allocate outlets. Outlets point to instances in your nib.
These instances are instantiated(/allocated) when the nib is loaded.
You usually set the File's Owner to be a your own subclass of
NSWindowController. Next control-drag from the File's Owner icon to
the window and the view to connect the outlets. (Btw, you can probably
better use the window outlet from the NSWindowController instead of
your spriteWindow outlet, though the latter may be needed if you
manage multiple related windows with one controller.)
You create your controller with this:
spriteController = [[SpriteController alloc]
initWithWindowNibName:@"YourNib"];
and to show the window you use:
[[spriteController window] makeKeyAndOrderFront:self];
or
[[spriteController spriteWindow] makeKeyAndOrderFront:self];
The drawRect: method of your SpriteView will get called automatically.
You do not need to do this yourself. You can force a view to update
its drawing using the method setNeedsDisplay:.
Btw, this:
[self setSpriteView: [[SpriteView alloc] init]];
will cause you to leak memory. Use this pattern:
SpriteView *mySpriteView = [SpriteView alloc] init];
[self setSpriteView: mySpriteView];
[mySpriteView release];
thought it should be noted that this is an uncommon way to instantiate
a view. (Usually done in nibs, and through the initWithFrame: method,
after which it is added as a subview to another view.)
Hth,
Johan
Op 24 jun 2008, om 14:17 heeft Joseph Ayers het volgende geschreven:
I am quite confounded with regard to how/when to allocate outlets
which are classes existing as instances in
another class. Consider
@interface SpriteController : NSWindowController {
IBOutlet SpriteView* spriteView;
IBOutlet NSWindow* spriteWindow;
}
SpriteController* spriteController;
- (id)spriteWindow;
- (id)spriteView;
-(void)setSpriteView:(SpriteView*)view;
}
SpriteView is defined in another subclass as:
@interface SpriteView: NSView
{
NSImage *spriteImage;
}
SpriteController and SpriteView are defined and connected in the NIB
When I open the NIB with
-(void)loadSpriteController{
if (spriteController == NULL) {
spriteController = [[SpriteController alloc] init];
if (![NSBundle loadNibNamed:@"spriteWindow"
owner:spriteController]) {
NSLog(@"Error loading SpriteController");}
else{
NSLog(@"SpriteController NIB Loaded"); }
}
}
spriteController gets a pointer, but spriteView is NIL. All
subsequent messages to spriteView are
messages to NIL
How/where should I be allocating spriteView. I've tried adding:
[self setSpriteView: [[SpriteView alloc] init]];
to loadSpriteController with no consequence. spriteView gets a
pointer but
[[spriteController spriteView] drawRect:[[spriteController
spriteWindow] bounds]];
does not get to drawRect
ja
--
Joseph Ayers, Professor
Department of Biology and
Marine Science Center
Northeastern University
East Point, Nahant, MA 01908
Phone (781) 581-7370 x309(office), x335(lab)
Cellular (617) 755-7523, FAX: (781) 581-6076 Boston Office 444RI,
(617) 373-4044
eMail: email@hidden
http://www.neurotechnology.neu.edu/
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