Il giorno 09/dic/2009, alle ore 01.49, Luke the Hiesterman ha scritto: >> >> So, just to understand, why can I do that through IB but not (legally) via >> code? The ability to choose a class for the navigation bar in a navigation >> controller should have been blocked in IB? >> >> You says about change Navigation Bar class to my subclass in IB "recommend >> avoiding even using this approach in IB", why? Should I read this in >> documentation or I would have inferred by readonly navigationBar property >> (because next time I would not ask the list similar question/problem)? >> >> I started working with Cocoa Touch a few days ago and I will not only learn >> the techniques but also best practices, philosophy and so on... > > Yes, the readonly is the key. Using IB to set the class of the navBar can be > thought of as a sort of work-around to the issue that a readonly property > isn't meant to be directly changed. Note, though, that you can safely modify > writeable properties of a readonly property. Example: > > UINavigationController has a navigationBar property, which is readonly, so > you can't change it, but... > UINavigationBar has a tintColor property which IS writeable, so while you > can't provide a different navigationBar, you can modify some properties of > the bar itself. >
Yes, I know, but no backgroundImage property :-) And Apple documentations says, for example: "It is permissible to modify the barStyle or translucent properties of the navigation bar but you must never change its frame,bounds, or alpha values directly." so very restrictive... > Hope that helps, and I wish you the best writing great iPhone code! > Many thanks for the tips and the good wishes > Luke Duccio _______________________________________________ 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
