Question

I dont want to add a sub view, but instead change the “self.view” to another view eg (A warning view) then after the user suppresses the warning I would like to switch back. When ever i try to switch back to the original view i just get a blank screen for reasons i cant understand.

Here is what i currently have in one of my UITableViewControllers

//Show warning view controller
self.warningViewControler = [[[WarningViewController alloc] init] autorelease];
self.view = self.warningViewController.view;


//Then later
self.view = self.tableView; //<< Dosnt work

Answer 1

If you want to change your view, and if the original view is defined/linked into XCode, you must retain it before changing self.view to another view. If not, the original view is released and using it back can cause bad things to happen.

Warning :

self.warningViewControler = [[[WarningViewController alloc] init] autorelease];
self.view = self.warningViewController.view

is a bad bad call. Because you autorelease the controller but you use its view. So you get a view retained with a released controller after some time. Retain the controller and release it yourself when its view is not needed anymore.