CODEWITHSUNDEEP
ios
Sai
Sai

Reputation: 128

loadview method is called several times

I create my views programmatically. If I do not put loadView method, the app runs well. However, When I add loadView method like this:

- (void)loadView
{
    NSLog(@"loadView is called");
}

I found this method was called many times! At last, the app crashed.

I wonder why loadView method is called so many time.

Can anyone help? Thanks a lot!

Upvotes: 1

Views: 1091

Answers (2)

jrturton
jrturton

Reputation: 119242

loadView is expected to, at some point, populate the view property of a view controller. The view property is lazily loaded (look at the call stack, you will see a method called something like _loadViewIfNeeded).

If loadView doesn't create a view, then each time the .view property is accessed, the view controller will call loadView again, trying to lazily load the view. At some point everything will go wrong because a view controller needs a view. If you access self.view from within your custom loadView, you'll get an infinite loop.

From the documentation:

You can override this method in order to create your views manually. If you choose to do so, assign the root view of your view hierarchy to the view property. The views you create should be unique instances and should not be shared with any other view controller object. Your custom implementation of this method should not call super.

Upvotes: 7

Matt Rees
Matt Rees

Reputation: 884

In your load view are you calling [self loadView] rather than [super loadView]

Upvotes: 0

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