Hello Angelo,
I think this code might help you:
@protocol BackgroundObjDelegate
@optional
- (void)showText:(NSString*)text;
@end
@interface BackgroundObj : NSObject
{
id _delegate;
}
@property(assign) id delegate
- (void) sayHi;
@end
@implementation BackgroundObj
@synthesize delegate=_delegate;
- (void) sayHi
{
if ([_delegate respondsToSelector:@selector(showText:)])
[_delegate showText:@"Hi"];
}
@end
Then, you could implement your delegate class, for example:
@interface ForegroundObj : NSObject
{
// Insert your instance variables
}
- (void)showText:(NSString*)text;
@end
@implementation ForegroundObj
- (id)init
{
if (![super init])
return nil;
BackgroundObj *obj = [[BackgroundObj alloc] init];
obj.delegate = self;// set the background object delegate
return self;
}
- (void)showText:(NSString*)text
{
// Insert your code
}
@end
If you have any questions, just ask, and please read Apple Docs, since
it's already quite complete in explaining these.
Regards,
Jesse
-
barablu (www.barablu.com), iPhone developer (http://jessearm.blogspot.com)
2008/6/10 Angelo Chen <[EMAIL PROTECTED]>:
> Hi,
>
> I have a code like this:
>
> @interface BackgroundObj : NSObject
> {
>Controller *mc;
> }
>
> - (void) sayHi;
>
>
> @implementation BackgroundObj
>
> - (void) sayHi
> {
>[mc showText:@"Hi"];
> }
> @end
>
> As you can see, the code is hard coded to use class Controller, can not be
> used with any other object, I'd like to add a delegate which will have a
> showText method, sayHi method will just call the delegate instead of hard
> coded Controller, any idea how to add delegates to this object? or, any
> tutorials for this? Thanks,
>
> Angelo
>
>
>
>
> Yahoo! Mail具備一流的網上安全保護功能，請前往 http://hk.antispam.yahoo.com/ 了解更多相關資訊!
> ___
>
> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
>
> Please do not post admin requests or moderator comments to the list.
> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>
> Help/Unsubscribe/Update your Subscription:
> http://lists.apple.com/mailman/options/cocoa-dev/mnemonic.fx%40gmail.com
>
> This email sent to [EMAIL PROTECTED]
>
___
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [EMAIL PROTECTED]
