iOS hides tabbar code in detail

-(void)viewWillAppear:(BOOL)animated
{
NSArray *array=self.tabBarController.view.subviews;
UIView *view=array[2];
view.frame=CGRectMake(0, [UIScreen mainScreen ].bounds.size.height, [UIScreen mainScreen ].bounds.size.width, 49);
[UIView commitAnimations];
}
- (void)viewWillDisappear:(BOOL)animated
{
NSArray *array=self.tabBarController.view.subviews;
UIView *view=array[2];
view.frame=CGRectMake(0, [UIScreen mainScreen ].bounds.size.height-49, [UIScreen mainScreen ].bounds.size.width, 49);
[UIView commitAnimations];
}

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