Xcode 4: nib files not loading when run

So, I just downloaded Xcode 4 and installed it. I was actually quite looking forward to the single window and integrated IB...

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However, when I open and run one of my projects, the nib files that the project uses don't seem to load. Instead I'm left looking at a blank white screen (iPhone). This project ran well and fine on Xcode 3.2.

If I background and un-background the app, the view loads fine. But this happens every time I build, on both iPhone and iOS simulator, i.e. the app doesn't work properly until it's been backgrounded. All the code for loading the view follows from

 - (void)applicationDidFinishLaunching:(UIApplication *)application.

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Did anyone else have the same nib file problems - is there a fix (or something stupidly simple that 开发者_StackOverflow社区I'm forgetting about)?

Ok after a lot of messing around, I figured out the nib problem.

I had a stray line of code in the appDelegate class:

self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

This line of code doesn't affect anything when compiling with Xcode 3.2, but with Xcode 4 causes the loading problem. Just remove it (I don't even remember why it was there...) and it's fixed :)

I'm not sure what's going on with your nibs, but this XCode 4 transition guide should be of some help for finding missing panels, menus etc...

I had the same problem. In my case, for some reason Xcode had decided to hide the view in question. It cleared up when I put the following into the viewDidAppear method of the view controller:

self.view.hidden = NO;

For anyone with the same error. If upper won't help - check if you did not overwrite the view attribute of your ViewController.