Question

I need to create several similar views
In a easy way,I create some views in xib(each full screen)

And I have a view controller to use this xib’s views,code like this:

NSArray* views = [[NSBundle mainBundle] loadNibNamed:@"MyXibName" owner:nil options:nil];
[self.view addSubview:[views objectAtIndex:aIndex]];

At this moment,view shows alright.

Now,there’s some buttons in those views,so I connect a outlet for each view

bad thing happened

app crashed due to

uncaught exception ‘NSUnknownKeyException’, reason: ‘[<NSObject 0x969db50> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key

Analyse:
Although my xib file’s “File Owner” has been set,but there’s no connection between xib and the only view controller.

How could I get the pointer of a view’s button?

Answer 1

You can do it like this:

NSNib*      aNib = [[NSNib alloc] initWithNibNamed:@"MyGreatNib" bundle:nil];
NSArray*    topLevelObjs = nil;

for (SomeClass *obj in myOwnerObjects) {
    topLevelObjs = nil;

    if (![aNib instantiateNibWithOwner:obj topLevelObjects:&topLevelObjs])
    {
        NSLog(@"Warning! Could not load nib file.\n");
        return;
    }

    for (id topLevelObj in topLevelObjs) {
        if ([topLevelObj isKindOfClass:[NSView class]]) {
            NSView *otView = (NSView *)topLevelObj;
            // set frame...
            [self addSubview:otView];
        }
    }
}