Q:

Why my Storyboard can't initiate on simulator?

I built a storyboard like this:

I didn't write a single line of code, and my settings seem to be correct.

So why do I always get a blank screen on simulator?

Please help me.

A:

Is your app delegate explicitly creating *window? If so, delete that line of code.
// self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

But keep the property definition:
@property (strong, nonatomic) UIWindow *window; // keep this

