iPhone Status BAR change as orientation rotates.

1. //Hide
2. [UIApplication sharedApplication].statusBarHidden = YES;
4. //Show
5. [UIApplication sharedApplication].statusBarHidden = NO;
   
   
   上面這段 code 在 (void)willAnimateSecondHalfOfRotationFromInterfaceOrientation: 裡面去跑的話,
   無法正確執行該功能.
   
   
   在willRotateToInterfaceOrientation 裡面可以