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Re: One Question
From: |
Pascal Bourguignon |
Subject: |
Re: One Question |
Date: |
Thu, 26 Apr 2001 05:31:52 +0200 (CEST) |
"Yen-Ju Chen" <yjchen@ms7.url.com.tw> wrote:
> I met a strange question.
> I design a Delegate class as the delegate of NSApplication,
> and this Delegate will create one or more Window class to show up the
> window.
> Then if Window class has a method, Black,
^^^^^^^^^^^^
> and the Delegate want to use this Black method,
> I write this code in Delegate class:
>
> - (void) Red {
>
> Window *myWin = [NSApp keyWindow];
> [myWin Black];
^^^^^ is a Window instance!
>
> NSLog (@"Red");
>
> }
>
> When no Window created, the program just shows "Red", which is expected.
> When I create the Window, the program has a error:
> NSWindow can't recognize Black.
> Is it right ?
>
> I set one menu to use the Red method, action: @selector(Red);
> but I don't think it matters.
>
> So how could I call Black in Window from Delegate ?
>
> PS. Delegate is inherited from NSObject,
> and Window from NSWindow.
>
> Thanx a lot!!
Class methods are used by the classes to answer to class messages,
ie. messages sent to the class.
Instance methods are used by the instances of a class to answer to
instance messages.
@interface AClass
{
}
+(id)alloc;
-(id)init;
+(void)aClassMethod;
-(void)anInstanceMethod;
@end
{
AClass* anInstance=[[AClass alloc] init];
// ^^^^^ ^^^^
// | |___ an instance method
// |___________a class method
[anInstance anInstanceMethod];
[AClass aClassMethod];
[[anInstance class] aClassMethod];
}
--
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- One Question, Yen-Ju Chen, 2001/04/25
- Re: One Question,
Pascal Bourguignon <=