iOS显示和隐藏TabBar

显示UITabBar

- (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;
    }
}

隐藏UITabBar

- (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;
    }
}