隐藏系统的uitabbar

继承UITabBarController   在ctrl里面执行如下语句 

-(void)removeSystemBar

{

    UIView *transitionView = [self.view.subviews objectAtIndex:0];

    transitionView.frame = CGRectZero;

    

    UIView *systemBarView = [self.view.subviews objectAtIndex:1];

    systemBarView.hidden = YES;

}