从超级视图中删除

Question

Just a small question i'm really having a lot of problems with

Basically, what I'm doing is making a view every time I hit a button which works fine. When I want to remove all the images I made when I hit the remove from superview it just removes the last one on the stack. Is there a way i can get rid of all the images I made?

Here is the code

This puts the picture on the screen

- (IBAction)pushBn:(id)sender {


    ZeldaView *newZelda = [[ZeldaView alloc]initWithNibName:@"ZeldaView" bundle:nil];

    theZeldaView=newZelda;
    [self.view insertSubview:theZeldaView.view atIndex:1];

}

this removes it when i touch it

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{


    UITouch *touch =[touches anyObject];
    CGPoint location=[touch locationInView:theZeldaView.view];

    if (CGRectContainsPoint(theZeldaView.theImage.frame, location)) {

        [theZeldaView.view removeFromSuperview];

    }

}

Answer 1

Sure, just iterate through the children of your parent view (self.view) and remove any that are ZeldaView elements.

At it's simplest this would be something like:

for (UIView* subView in [self.view.subviews])
{
    if ([subView isKindOfClass:[ZeldaView class]])
        [subView removeFromSuperview];
}

Though you will probably want to expand on this to not perform the actual removal during the iteration and you may want to use respondsToSelector and a custom method instead of checking the class here so that you can do any cleanup needed from within the ZeldaView class. Hopefully that makes sense to you.

Answer 2

sure, many ways to do this. I would keep an array of ZeldaView objects and when you want to remove them, traverse the array and remove them all.

in your .h:

@property (nonatomic, retain) NSMutableArray *zeldaViews;

when you add a ZeldaView:

// create a newZeldaView and add it to the superview
[self.zeldaViews addObject:newZeldaView];

when you want to remove them all:

for (ZeldaView *zeldaView in self.zeldaViews) {
    [zeldaView.view removeFromSuperview];
}
[self.zeldaViews removeAllObjects];

create the mutable array in viewDidLoad and release it in viewDidUnload and dealloc. Modify as approp if your using ARC.