On Sat, Oct 4, 2008 at 3:43 PM, Andre Masse <[EMAIL PROTECTED]> wrote:
> Hi,
>
> Can someone explain to me why I get this compiler warning (BigLetterView is
> a subclass of NSView):
>
> 'BigLetterView' may not respond to '-prepareAttributes'
>
>
>
> - (id)initWithFrame:(NSRect)rect {
>
> if(![super initWithFrame:rect]) {
> return nil;
> }
> NSLog(@"intializing view");
> [self prepareAttributes]; // <------------ warning on this line
> bgColor = [[NSColor yellowColor] retain];
> string = @" ";
>
> return self;
> }
>
> while later in the same source file, the following method is defined:
>
> - (void)prepareAttributes
> {
> NSLog(@"prepareAttributes called");
> attributes = [[NSMutableDictionary alloc] init];
> [attributes setObject:[NSFont fontWithName:@"Helvetica" size:75]
> forKey:NSFontAttributeName];
> [attributes setObject:[NSColor redColor]
> forKey:NSForegroundColorAttributeName];
> }
>
> I know I can fix this easily by declaring prepareAttributes in the header
> file or in an @interface block in the '.m' file, but I'm curious why I get
> this warning if an only if I make the call in the initWithFrame method.
> Calling [self prepareAttributes] in any other method doesn't generate any
> warning.
>
> Does calling an instance method in the initialization phase require
> something special?
>
I'm guessing that the times where it doesn't warn occur after "-
(void)prepareAttributes" ?
To avoid those warnings, the method declaration or definition needs to
appear before it's used. I usually add a private category at the top
of my .m files where you can declare private methods - something like
this :
@interface BigLetterView ()
- (void)prepareAttributes;
@end
@implementation BigLetterView
- (id)initWithFrame:(NSRect)rect {
...
}
-(void)prepareAttributes {
...
}
@end
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