iOS tabBarView的隐藏以及自定义tabBarViewController

概述：

1、隐藏：系统方法隐藏；自定义容器随意隐藏

2、自定义：干掉tabBar 的view，并替换；完全自定义一，把pageViewController作为容器

 

第一种需求，需要二级界面隐藏tabBar，三级界面再显示出来（很奇葩的需求）

在UITabbarController包含的UINavigationController应用中，如果UINavigationController某一页（某个level）需要隐藏Tabbar，之前的做法是在push那一页之前，将那一页的ViewController中的hidesBottombarWhenPushed参数设为YES，这样当那一页push进UINavigationController中时，底部的Tabbar就会隐藏掉。

但是这种方法有一个潜在的而又巨大的问题，假设现在我有3个ViewController A,B,C，其中A为Navigation的RootViewController，A中push B，B中push C。这时，如果我想要在B中隐藏Tabbar，而在C中显示Tabbar，根据最朴素的想法就是：

//SecondLevel即为B，此代码在A中进行
SecondLevelViewController *_2vc = [[SecondLevelViewController alloc]init];
_2vc.hidesBottomBarWhenPushed = YES;
[self.navigationController pushViewController:_2vc animated:YES];  

//ThirdLevel即为C，此代码在B中进行
ThirdLevelViewController *_3vc = [[ThirdLevelViewController alloc] init];
_3vc.hidesBottomBarWhenPushed = NO;
[self.navigationController pushViewController:_3vc animated:YES];

然而很可惜，虽然A中push B能让Tabbar隐藏，但是B中push C，就没办法让Tabbar显示出来了。这是一个比较郁闷的问题，我只能猜想其中的原理是，当设置某一层hidesBottomBarWhenPushed = YES之后，UITabbarController就像不存在一样，就连调用self.tabbarController或者self.navigationController.tabbarController也应该是nil。

所以解决办法只能是手动隐藏Tabbar。

- (void) hideTabBar:(UITabBarController *) tabbarcontroller {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5];
    for(UIView *view in tabbarcontroller.view.subviews)
    {
        if([view isKindOfClass:[UITabBar class]])
        {
            [view setFrame:CGRectMake(view.frame.origin.x, HEIGHTIPHONE, view.frame.size.width, view.frame.size.height)];
        }
        else
        {

            [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, HEIGHTIPHONE)];
        }
    }
    [UIView commitAnimations];
}

- (void) showTabBar:(UITabBarController *) tabbarcontroller {
    
    
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5];
    for(UIView *view in tabbarcontroller.view.subviews)
    {

        if([view isKindOfClass:[UITabBar class]])
        {
            [view setFrame:CGRectMake(view.frame.origin.x, HEIGHTIPHONE-view.frame.size.height, view.frame.size.width, view.frame.size.height)];
        }
        else
        {
            [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, HEIGHTIPHONE-49)];
        }
    }
    
    [UIView commitAnimations];
}

 

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    if (_isPush) {
        
        [self showTabBar:self.tabBarController];
        
    }
    _isPush = NO;
}

 

- (void)viewWillAppear:(BOOL)animated  {
    
    [super viewWillAppear:animated];
    [self hideTabBar:self.tabBarController];  

}

上面是在一篇文章里学到的，原文地址点击打开链接，很给力，给我门找到了一个平滑的方法，看着很流畅

1 、 在做显示动画的时候我建议写在viewDidAppear里面，这样看着舒服。

2、 两个方法分开，需要隐藏的视图光写隐藏就好了，

 

第二种需求，二级界面都隐藏，TabBar样式可自定义（颜色、图标，甚至tabBar的高度）

下面是我自己的一套实现思路，仅供参考

用一个UIPageViewController替代UITabBarViewController，把几个控制器放在Page里面，然后在pageVC下面放一个CollectionView来自定义我们下面Bar的样式。Demo就不写了，好好读一下，能更好的去自定义这些东西

1、PageViewController实现及属性、接口暴漏

.h文件：

@interface GPPageViewController : UIViewController

/** 当前页 */
@property (nonatomic, assign, readonly) NSInteger currentPageIndex;

/** 转场动画 默认yes */
@property (nonatomic, assign) BOOL animated;
/** 可否滚动 默认yes */
@property (nonatomic, assign) BOOL scrollEnabled;
// 实现pageVC的两个条件
/** 子控制器集合 */
@property (nonatomic, strong) NSMutableArray *viewControllers;
/** inset （默认全屏）*/
@property (nonatomic, assign) CGRect contentInset;


- (void)selectItemAtIndex:(NSInteger)index ;

- (void)pageDidChange:(NSInteger)page;


/** 滚动 */
@property (nonatomic, strong, readonly) UIScrollView *scrollView;

@end

.m文件

#import "GPPageViewController.h"

@interface GpPageViewController () 

/** 页面控制 */
@property (nonatomic, strong) UIPageViewController *pageViewController;
/** 页面 */
@property (nonatomic, strong) UIPageControl *pageControl;

@end


@implementation GPPageViewController

- (instancetype)init {
    
    if (self = [super init]) {
        CGSize mainSize = [UIScreen mainScreen].bounds.size;
        self.contentInset = CGRectMake(0, 0, mainSize.width, mainSize.height);
        self.scrollEnabled = YES;
        self.animated = YES;
        self.automaticallyAdjustsScrollViewInsets = NO;
    }
    return self;
}

- (void)viewDidLoad {
    
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    
}

- (BOOL)shouldAutorotate {
    return NO;
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
}

- (void)backForward_default_navigation {
    
    if (self.navigationController.topViewController == self &&
        self.navigationController.viewControllers.count > 1) {
        [self.navigationController popViewControllerAnimated:YES];
    } else {
        [self dismissViewControllerAnimated:YES completion:nil];
    }
}

- (void)setScrollEnabled:(BOOL)scrollEnabled {
    _scrollEnabled = scrollEnabled;
    [self findScrollView];
}


- (void) setContentInset:(CGRect)contentInset {
    
    _contentInset = contentInset;
    
    self.pageViewController.view.frame = contentInset;
    
}

- (void)setViewControllers:(NSMutableArray *)viewControllers {
    
    if (viewControllers.count > 0) {
        _viewControllers = viewControllers;
        [self configurePageViewController];
    }
}


#pragma mark  - >> public <<
//选择
- (void)selectItemAtIndex:(NSInteger)index {
    
    if (index != self.currentPageIndex) {
        [self selectViewControllerAtIndex:index];
    }
    
    [self pageDidChange:self.currentPageIndex];
}
- (void)pageDidChange:(NSInteger)page {
    
}


#pragma mark  - >> pageControl <<

//取控制器和控制器序号
- (UIViewController *)viewControllerAtIndex:(NSUInteger)index {
    
    return (UIViewController *)[self.viewControllers objectAtIndex:index];
}

- (NSUInteger)indexOfViewController:(UIViewController *)viewController {
    
    return [self.viewControllers indexOfObject:viewController];
}

#pragma mark  - >> pageViewController <<
- (void)selectViewControllerAtIndex:(NSInteger)index {
    
    if (index >= _viewControllers.count) {
        index = _viewControllers.count - 1;
    }
    if (index < 0) {
        index = 0;
    }
    
    UIViewController *startingViewController = (UIViewController *)[self viewControllerAtIndex:index];
    NSArray *viewControllers = @[startingViewController];
    if (index > self.currentPageIndex) {
        [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:self.animated completion:nil];
    } else if (index < self.currentPageIndex) {
        [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionReverse animated:self.animated completion:nil];
    }
    
    _currentPageIndex = index;
    
}

- (void)configurePageViewController {
    
    if (!_pageViewController) {
        _pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
        _pageViewController.delegate = self;
        _pageViewController.dataSource = self;
        
        [self addChildViewController:_pageViewController];
        [self.view addSubview:_pageViewController.view];
        
        _pageViewController.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    }
    
    _pageViewController.view.frame = _contentInset;
    
    [_pageViewController didMoveToParentViewController:self];
    
    UIViewController *startingViewController = (UIViewController *)[self viewControllerAtIndex:self.currentPageIndex];
    NSArray *viewControllers = @[startingViewController];
    [_pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
    
    self.view.gestureRecognizers = _pageViewController.gestureRecognizers;
    
    [self findScrollView];
}


#pragma mark - UIPageViewControllerDataSource
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
    
    NSUInteger index = [self indexOfViewController:viewController];
    if ((index == 0) || (index == NSNotFound)) {
        return nil;
    }
    index--;
    return [self viewControllerAtIndex:index];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
    
    NSUInteger index = [self indexOfViewController:viewController];
    
    if (index == NSNotFound) {
        return nil;
    }
    
    index++;
    if (index == [self.viewControllers count]) {
        return nil;
    }
    return [self viewControllerAtIndex:index];
}


#pragma mark - UIPageViewControllerDelegate
- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation {
    
    UIViewController *currentViewController = self.pageViewController.viewControllers[0];
    NSArray *viewControllers = @[currentViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:self.animated completion:nil];
    self.pageViewController.doubleSided = NO;
    return UIPageViewControllerSpineLocationMin;
}

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed {
    if (completed) {
        
        _currentPageIndex = [self indexOfViewController:[pageViewController.viewControllers lastObject]];
        // 子类如果实现了方法，会收到滚动消息
        [self pageDidChange:self.currentPageIndex];
    }
}

// 偷偷的找到滚动
- (void)findScrollView {
    
    UIScrollView *scrollView;
    for(id subview in self.pageViewController.view.subviews){
        
        if([subview isKindOfClass:UIScrollView.class]){
            
            scrollView = subview;
            scrollView.delegate = self;
            
            break;
        }}
    
    scrollView.scrollEnabled = self.scrollEnabled;
    _scrollView = scrollView;
}

@end

上面是实现一个pageVC的代码

2、然后我们可以创建一控制器AVC，继承于上面的GPPageViewController，然后再给AVC自定义一个tabBarView就可以作为我们的TabBarVC了，下面们简单的写一下主要的代码

- (void)viewDidLoad {
    [super viewDidLoad];
    // 1、设置控制器的展示范围，还有控制器都有哪些，加上collectionView伪装成的tabBarView
    //设置一下控制器的范围， 
    self.contentInset = CGRectMake(0, 0, 屏幕宽度, 屏幕高度 - TabBarHeight - iPhoneX的多余高度);
    self.scrollEnabled = NO;
    self.animated = NO;
    
self.viewControllers = @[vc1, vc2, vc3];

// 添加一个collection创建的View,模拟tabBar
/* 实现... */
}

//2、反向控制：page修改后，让collection刷新（）
- (void)pageDidChange:(NSInteger)page; {

    [_tabBarCollectionView reloadData]
}

//3、正向控制：tabBarCollectionView 控制page的当前选定页，也可以考虑使用block回调等

- (void)didSelectItemAtIndex:(NSInteger)index {
    if (index != self.currentPageIndex) {
        [self selectItemAtIndex:index];
    } else {

     // 可以像微信、京东一样，选定后再点击，就刷新一下当前页面
    }
}

3、回归主题，我们讨论的是如何隐藏tabBar，具体如下

1）如果二级界面都需要隐藏，那么直接找到AVC的导航，去推二级界面，就OK了

2）如果需要部分二级别界面显示tabBar，那就在单个控制器的导航（AVC.viewControllers[index].navigationViewController）上推二级界面

其实tabbar是我们自定义的一个collectionView，那么想怎么玩，你自己随时拿过来搞就可以了，为了方便拿到这个TabBar，可以把AVC的初始化设置成单例，暴漏其tabBar就可以啦。也方便几个控制器之间用代码来回切换。

 

致歉：之前这篇文章属于转载的，存在一定的错误，由于时间问题也没来得及维护，今天翻看发现，存在一些问题，做了修改，同时还增加了一个自定义tabbar的方法，方便使用