自定义实现UITabBarController

需求如下 效果图

屏幕快照 2019-04-03 上午10.00.36.png

思路

这个需求是,通过切换标签来切换不同的页面,如果在一个controller管理这些view,代码的耦合度就很高。
我就想到了,通过addChildViewController来管理。首先创建一个APTabBarVC继承UITabBarController

  • 将这不同的vc添加到Controller的ChildViewController,建立父子关系,可以通过parentViewController访问vc的父类,调用addChildViewController方法.
  • 创建首页、应用、数据、我的VC 将首页VC与UINavigationController结合的方式initWithRootViewController。
  • 中间那个+号 作为占位用。
    直接将这个VC addChildViewController中。
    中间按钮的Button是通过继承UITabBar,进行重构实现的。

具体实现如下

添加自定义子控制器的方法

@implementation APTabBarVC

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self addChildViewControllers];
}

- (void)selectAppListMenu{
    [self setSelectedIndex:1];
}


- (void)addChildViewControllers{
    [self addChildViewController:[[APPortalVC alloc] init] andTitle:@"首页" andImageName:@"sc_tabbar_portal_noselected" addSelectImage:@"sc_tabbar_portal_selected" tag:1000];
    [self addChildViewController:[[APAppListVC alloc] init] andTitle:@"应用" andImageName:@"sc_tabbar_app_noselected" addSelectImage:@"sc_tabbar_app_selected" tag:1001];
    [self addChildViewController:[[APAppDataDisplayVC alloc] init] andTitle:@"数据" andImageName:@"sc_tabbar_data_noselected" addSelectImage:@"sc_tabbar_data_selected" tag:1002];
    [self addChildViewController:[[APUserVC alloc] init] andTitle:@"我的" andImageName:@"sc_tabbar_me_noselected" addSelectImage:@"sc_tabbar_me_selected" tag:1003];
    self.tabBar.tintColor = [UIColor blackColor];

}

- (void)addChildViewController:(UIViewController *)childVC andTitle:(NSString *)title andImageName:(NSString *)imageName addSelectImage:(NSString *)selectedImaga tag:(NSInteger)tag{
    childVC.tabBarItem.image = [UIImage imageNamed:imageName];
    childVC.tabBarItem.selectedImage = [UIImage imageNamed:selectedImaga];
    childVC.title = title;
    childVC.tabBarItem.tag = tag;
    UINavigationController *baseNav = [[UINavigationController alloc] initWithRootViewController:childVC];
    [self addChildViewController:baseNav];
}

效果图如下:


屏幕快照 2019-04-08 下午3.27.02.png

如果想要在tabbar上面增加一个按钮(注意!!!不是item,tabBarItem是图片在上,文字在下的格式),产品需求的这个按钮和item样式不一样,占据了和item上文字加图片的大小。由于添加到tabbar上面的item是从左到右的顺序排列的,如果是直接添加一个item,那么不能达到我们想要的效果,这个时候,我们就要考虑通过自定义tabbar来实现。
效果图如下:


屏幕快照 2019-04-08 下午4.01.49.png
  • 由于tabber是read-only属性,所以只能通过KVC模式更换tabbar
@property(nonatomic,readonly) UITabBar *tabBar NS_AVAILABLE_IOS(3_0); // Provided for -[UIActionSheet showFromTabBar:]. Attempting to modify the contents of the tab bar directly will throw an exception.

具体实现步骤:

  • 创建一个继承自UITabbar的类
  • 添加一个UIButton属性。
  • 然后设置centerX坐标

代码如下:

#import "APTabBar.h"

@implementation APTabBar
- (instancetype)init{
    if (self = [super init]) {
        [self initView];
    }
    return self;
}

- (void)initView{
    self.centerBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [self.centerBtn setFrame:CGRectMake(([UIScreen mainScreen].bounds.size.width-46)/2.0, 3, 46, 46)];
    [self.centerBtn setImage:[UIImage imageNamed:@"sc_portal_tabbar_add_btn"] forState:UIControlStateNormal];
    [self.centerBtn setBackgroundColor:[UIColor whiteColor]];
    self.centerBtn.layer.cornerRadius = self.centerBtn.frame.size.height/2;
    self.centerBtn.adjustsImageWhenHighlighted = NO;
    [self addSubview:self.centerBtn];
}

@end

在APTabBarVC中增加这一段代码,就可以实现效果图的效果了。

 self.centerNav = [[UINavigationController alloc] initWithRootViewController:[UIViewController new]];
    [self addChildViewController:self.centerNav];

点击中间的按钮 会弹出一个视图效果如下:


屏幕快照 2019-04-08 下午4.40.01.png

再次点击×图片 视图关闭。

具体实现如下:

-自定义一个继承UIView的视图

  • 创建一个UICollectionView和cancleBtn
  • 实现cancleBtn的回调
  • 设置数据源dataArrayM用于展示开门、提报、扫码等

APTabBarCenterPresentView
代码如下:

@interface APTabBarCenterCollectionCell:UICollectionViewCell
@property (nonatomic, strong) UIButton *btn;
@property (nonatomic, strong) UILabel *titleLabel;
@end

@implementation APTabBarCenterCollectionCell

- (instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        [self addSubViews];
        [self setupFrame];
    }
    return self;
}

- (void)addSubViews{
    [self.contentView addSubview:self.btn];
    [self.contentView addSubview:self.titleLabel];
}

- (void)setupFrame{
    self.btn.frame = CGRectMake(self.frame.size.width/2, 20, 40, 40);
    self.titleLabel.frame = CGRectMake(0, self.btn.frame.size.height, self.frame.size.width, 25);
}

#pragma mark 填充数据
- (void)setCellWithModel{
    self.titleLabel.text = @"开门";
    [self.btn setImage:[UIImage imageNamed:@""] forState:UIControlStateNormal];
}

- (UIButton *)btn{
    if (!_btn) {
        _btn = [UIButton buttonWithType:UIButtonTypeCustom];
        _btn.backgroundColor = [UIColor whiteColor];
        [_btn setTitle:@"+" forState:UIControlStateNormal];
        [_btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        _btn.layer.cornerRadius = 20;
        _btn.titleLabel.font = [UIFont systemFontOfSize:35];
        _btn.userInteractionEnabled = NO;
    }
    return _btn;
}

- (UILabel *)titleLabel{
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] init];
        _titleLabel.textColor = [UIColor grayColor];
        _titleLabel.textAlignment = NSTextAlignmentCenter;
    }
    return _titleLabel;
}

@end


@interface APTabBarCenterPresentView()<UICollectionViewDelegate,UICollectionViewDataSource>
@property (nonatomic, strong)UIButton *cancelBtn;
@property (nonatomic, strong)UICollectionView *collectionView;

@end

@implementation APTabBarCenterPresentView
- (instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        [self addSubViews];
        [self setupFrame];
    }
    return self;
}

- (void)addSubViews{
    //毛玻璃的效果
    UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
    UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
    effectView.alpha = 0.9;
    effectView.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
    [self addSubview:effectView];
    
    [self addSubview:self.collectionView];
    [self addSubview:self.cancelBtn];
    self.collectionView.backgroundColor = [UIColor clearColor];
}

- (void)setDataArrayM:(NSMutableArray *)dataArrayM{
    _dataArrayM = dataArrayM;
    [self.collectionView reloadData];
}

- (void)setupFrame{
    self.collectionView.frame = CGRectMake(0, 10, self.frame.size.width, self.frame.size.width/3);
    self.cancelBtn.frame = CGRectMake(self.frame.size.width/2-20, self.frame.size.height-60, 40, 40);
}

- (void)cancleAction{
    self.cancleBlock?self.cancleBlock():nil;
}

#pragma mark 懒加载
- (UIButton *)cancelBtn{
    if (!_cancelBtn) {
        _cancelBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [_cancelBtn setImage:[UIImage imageNamed:@""] forState:UIControlStateNormal];
        [_cancelBtn addTarget:self action:@selector(cancleAction) forControlEvents:UIControlEventTouchUpInside];
        [_cancelBtn setTitle:@"×" forState:UIControlStateNormal];
        _cancelBtn.titleLabel.font = [UIFont systemFontOfSize:20];
        _cancelBtn.layer.cornerRadius = 20;
        _cancelBtn.layer.backgroundColor = [UIColor lightGrayColor].CGColor;
        _cancelBtn.layer.borderWidth = 1;
        _cancelBtn.backgroundColor = [UIColor whiteColor];
    }
    return _cancelBtn;
}

- (UICollectionView *)collectionView{
    if (!_collectionView) {
        UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
        flowLayout.minimumLineSpacing = 0;
        flowLayout.minimumInteritemSpacing = 0;
        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:flowLayout];
        _collectionView.backgroundColor = [UIColor whiteColor];
        _collectionView.delegate = self;
        _collectionView.dataSource = self;
        [_collectionView registerClass:APTabBarCenterCollectionCell.class forCellWithReuseIdentifier:@"APTabBarCenterCollectionCell"];
    }
    return _collectionView;
}

//设置分区数
- (NSInteger)collectionView:(nonnull UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.dataArrayM.count;
}

//设置返回每个item的属性
- (nonnull __kindof UICollectionViewCell *)collectionView:(nonnull UICollectionView *)collectionView cellForItemAtIndexPath:(nonnull NSIndexPath *)indexPath {
    APTabBarCenterCollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"APTabBarCenterCollectionCell" forIndexPath:indexPath];
    cell.contentView.backgroundColor = [UIColor clearColor];
    return cell;
    
}

//已经选中某个item时触发的方法
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    if (self.dataArrayM.count > indexPath.row) {
        self.addBlock?self.addBlock():nil;
    }
}

//是否可以选中某个Item,返回NO,则不能选中
- (BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    return YES;
}

//通过调整inset使单元格顶部和底部都有间距(inset次序: 上,左,下,右边)
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{
    return UIEdgeInsetsMake(0, 0, 0, 0);
}

//设置每个单元格的大小
- (CGSize)collection:(UICollectionView *)collection layout:(nonnull UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(nonnull NSIndexPath *)indexPath{
    return CGSizeMake(self.frame.size.width/3, self.frame.size.width/3);
}

@end

APTabBarVC

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.centerBar = [[APTabBar alloc] init];
    [self.centerBar.centerBtn addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
    self.centerBar.tintColor = [UIColor redColor];
    self.centerBar.translucent = NO;
    [self setValue:self.centerBar forKey:@"tabBar"];
    self.delegate = self;
    [self addChildViewControllers];
    [self.view addSubview:self.presentView];
    
    NSMutableArray *presentApplist = [NSMutableArray array];
    NSArray *list;
    list = @[@{@"title":@"开门",@"color":@"0x6D9FFF",@"action":@"goRemoteOpenDoorAction",@"icon":@"sc_portal_openDoor"},
             @{@"title":@"扫码",@"color":@"0xF89656",@"action":@"scanInspectionDeviceQRCode",@"icon":@"sc_portal_scan"},];
    [presentApplist addObjectsFromArray:list];
    self.presentView.dataArrayM = presentApplist;
    
    __weak __typeof(&*self)weakSelf = self;
    self.presentView.addBlock = ^{
        __strong __typeof(&*weakSelf)strongSelf = weakSelf;
        strongSelf.presentView.hidden = YES;
    };
}

在这个方法里面addChildViewControllers 增加

self.centerNav = [[UINavigationController alloc] initWithRootViewController:[UIViewController new]];
    [self addChildViewController:self.centerNav];

懒加载

- (void)buttonAction:(UIButton *)button{
    self.presentView.hidden = NO;
    [self.view bringSubviewToFront:self.presentView];
}

-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
    if (item.tag<=0) {
        [self buttonAction:nil];
    }
}

- (APTabBarCenterPresentView *)presentView{
    if (!_presentView) {
        _presentView = [[APTabBarCenterPresentView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height-250, self.view.frame.size.width, 250)];
        _presentView.hidden = YES;
        __weak __typeof(&*self)weakSelf = self;
        _presentView.cancleBlock = ^{
            __strong __typeof(&*weakSelf)strongSelf = weakSelf;
            strongSelf.presentView.hidden = YES;
        };
    }
    return _presentView;
}

最后效果就是这样


屏幕快照 2019-04-12 下午3.21.27.png

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