Objective C: open and close a subview

Question

This is my code with two IBAction for open and close a subview in two different classes

- (IBAction) showListClient:(id) sender {

if( list == nil){

    list = [[ListClient alloc] initWithNibName:@"ListClient" bundle:nil];
    [list setDelegate:self];
    [self.view addSubview:list.view];
}

}

and for close

-(IBAction)closeListClient {
[self.view removeFromSuperview];
}

now it's ok for the first time, but if I want use more time my list I must write in closeListClient

list = nil;
[list release];

now my problem is this "list" is declared only in the class ListClient as

ListClient *list;

and when I write list in CloseListClient is an error...what can I do?

Answer 1

In ListCLient.h define a protocol for its delegate:

@protocol ListClientDelegate<NSObject>
@optional
- (void)listClientDidClose:(ListClient *)listClient;
@end

and modify the property definition for delegate:

@property (nonatomic, assign) id<ListClientDelegate> delegate;

Then send a message to the delegate when the closeListClient action is called (in ListClient.m):

-(IBAction)closeListClient {
    [self.view removeFromSuperview];
    [self.delegate listClientDidClose:self]
}

Then finally in SomeController.m implement the delegate method:

-(void)listClientDidClose:(ListClient *)listClient {
    [list release];
    list = nil;
}

I hope that solves your proplem.