I have a UIWebView displaying the contents of a local html file. When the user presses a button, I'd like to transition, with a fade, to another UIWebView (also displaying local content; no need to wait for the network.) The UIView transitions will not do a fade, but a CATransition on a CALayer would do the trick. Of course, I'd need to apply to the CATransition to a layer containing both of the webViews, but that's fine; the UIWebViews are both subviews of another UIView that serves simply to contain both of them. As I understand, when a subview is added to a view, the layer calls -[CALayer actionForKey:], which goes through the following search (self refers to the CALayer on which actionForKey: was called): 1. [self.delegate actionForLayer:forKey:] 2. [self.actions valueForKey:] 3. Recursively search self.style for an actions dictionary, then [actions valueForKey:] 4. [self defaultActionForKey:]
If any of these steps returns a non-nil result, that value is used. Especially relevant in this case is the fact that when an NSNull is returned, the search stops and nil is returned from [CALayer actionForKey:]. The problem is that, as near as I can tell, UIView's implementation of actionForLayer:forKey: returns an NSNull. I would have liked to add a CATransition to the container view's layer's action dictionary (view.layer.actions) for the key kCAOnOrderIn. However, since UIView's actionForLayer:forKey: returns NSNull, the search always bails out after the first step. This seems odd, since it seems that defaultActionForKey: never actually gets the chance to return a default action unless you're already changing things. Am I missing something here, or is a UIView's layer's actions dictionary only usable if you're subclassing UIView? -BJ Homer _______________________________________________ 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 arch...@mail-archive.com
