Iphone隐藏和显示TabBar的方法

- (void)hideTabBar {
    if (self.tabBarController.tabBar.hidden == YES) {
        return;
    }
    UIView *contentView;
    if ( [[self.tabBarController.view.subviews objectAtIndex:0] isKindOfClass:[UITabBar class]] ) {
        contentView = [self.tabBarController.view.subviews objectAtIndex:1];
    }else {
        contentView = [self.tabBarController.view.subviews objectAtIndex:0];
    }
    
    contentView.frame = CGRectMake(contentView.bounds.origin.x,
                                   contentView.bounds.origin.y,
                                   contentView.bounds.size.width,
                                   contentView.bounds.size.height + self.tabBarController.tabBar.frame.size.height);
    self.tabBarController.tabBar.hidden = YES;
    
}


- (void)showTabBar

{
    if (self.tabBarController.tabBar.hidden == NO)
    {
        return;
    }
    UIView *contentView;
    if ([[self.tabBarController.view.subviews objectAtIndex:0] isKindOfClass:[UITabBar class]]) {
        contentView = [self.tabBarController.view.subviews objectAtIndex:1];
    }else {
        contentView = [self.tabBarController.view.subviews objectAtIndex:0];
    }
    contentView.frame = CGRectMake(contentView.bounds.origin.x,
                                   contentView.bounds.origin.y,
                                   contentView.bounds.size.width,
                                   contentView.bounds.size.height - self.tabBarController.tabBar.frame.size.height);
    self.tabBarController.tabBar.hidden = NO;
    
}