有时候项目需求TabBar在侧边,不在底部,当需要的时候显示出来,不需要的时候隐藏

基于这种需求,自定义一个侧边栏和UITabController

第一步:

首先封装一个侧边栏的控件

.h文件

#import <UIKit/UIKit.h>

@protocol LeftViewDelegate <NSObject>
/**
 点击侧边栏按钮调用方法(必写)

 @param selectedIndex 按钮tag
 */
@required
- (void)didClickChildButton:(int)selectedIndex;

@end

@interface LeftView : UIView

@property(nonatomic, strong) NSArray *itemArray;
@property(nonatomic, strong) id <LeftViewDelegate>delegate;

@end

@interface TabButton : UIButton

@end

.m文件

#import "LeftView.h"

#define VIEW_WIDTH self.bounds.size.width
#define VIEW_HEIGHT self.bounds.size.height

@interface LeftView()

@property(nonatomic, strong) UIButton *selectedButton;

@end

@implementation LeftView

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

- (void)setUp
{
    self.backgroundColor = [UIColor whiteColor];
}

- (void)setItemArray:(NSArray *)itemArray
{
    _itemArray = itemArray;
    int n = 0;
    for (NSDictionary *dict in itemArray) {
        TabButton *button = [TabButton buttonWithType:UIButtonTypeCustom];
        [button setTitle:dict[@"title"] forState:UIControlStateNormal];
        [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [button setImage:[UIImage imageNamed:dict[@"image"]] forState:UIControlStateNormal];
        [button setImage:[UIImage imageNamed:dict[@"selectImage"]] forState:UIControlStateSelected];
        button.tag = 999 + n;
        [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:button];
        // 默认第一个按钮点击,跟tabbarController默认选中的控制器index一致
        if (n == 0) {// 0
            self.selectedButton = button;
            self.selectedButton.selected = YES;
        }
        n ++;
    }
}

- (void)buttonClick:(UIButton *)button
{
    int tag = (int)button.tag - 999;
    NSLog(@"点击了%d个按钮",tag);
    if ([self.delegate respondsToSelector:@selector(didClickChildButton:)]) {
        [self.delegate didClickChildButton:tag];
        self.selectedButton.selected = NO;
        self.selectedButton = button;
        self.selectedButton.selected = YES;
    }
}

-(void)layoutSubviews
{
    CGFloat height = [UIScreen mainScreen].bounds.size.height / 4;
    
    for (UIView *child in self.subviews) {
        Class class = NSClassFromString(@"UIButton");
        if ([child isKindOfClass:class]) {
            int tag = (int)child.tag - 999;
            child.frame = CGRectMake(0, height * tag, VIEW_WIDTH, height);
        }
    }
}

@end

#pragma mark - 自定义tabBar按钮
@implementation TabButton

- (void)layoutSubviews{
    [super layoutSubviews];
    
    self.imageView.frame = CGRectMake(0, VIEW_HEIGHT * 0.1, VIEW_WIDTH, VIEW_HEIGHT * 0.5);
    self.imageView.contentMode = UIViewContentModeScaleAspectFit;
    self.titleLabel.frame = CGRectMake(0, VIEW_HEIGHT * 0.6, VIEW_WIDTH, VIEW_HEIGHT * 0.2);
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
    
}

@end

第二步:自定义UITabController

.m文件

#import "MainTabBarController.h"
#import "OneViewController.h"
#import "TwoViewController.h"
#import "ThreeViewController.h"
#import "FourViewController.h"
#import "LeftView.h"

// 侧边栏的宽度
#define LEFT_WIDTH 100

@interface MainTabBarController ()<LeftViewDelegate>

@property(nonatomic, strong) LeftView *lefeView;
@property(nonatomic, strong) UIView *bgView;
@property (assign, nonatomic,getter=isHidden)  BOOL hidden;
// tabBar 的标题+图片字典数组
@property(nonatomic, strong) NSMutableArray *tabItems;

@end

@implementation MainTabBarController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    // init child vc
    NSMutableArray *array = [NSMutableArray array];
    OneViewController *onevc = [[OneViewController alloc] init];
    TwoViewController *twovc = [[TwoViewController alloc] init];
    ThreeViewController *threevc = [[ThreeViewController alloc] init];
    FourViewController *fourvc = [[FourViewController alloc] init];
    
    [self setUpChildViewController:onevc array:array title:@"话题" imageName:@"tabbar_topic" selectImageName:@"tabbar_topic_selected"];
    [self setUpChildViewController:twovc array:array title:@"材料" imageName:@"tabbar_material" selectImageName:@"tabbar_material_selected"];
    [self setUpChildViewController:threevc array:array title:@"表单" imageName:@"tabbar_form" selectImageName:@"tabbar_form_selected"];
    [self setUpChildViewController:fourvc array:array title:@"更多" imageName:@"tabbar_more" selectImageName:@"tabbar_more_selected"];
    
    self.viewControllers = array;
    self.selectedIndex = 0;
    self.hidden = YES;
    
    // ori tabbar set nil ......
    [self setValue:nil forKeyPath:@"tabBar"];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

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

- (void)setUpChildViewController:(UIViewController *)viewController array:(NSMutableArray *)array title:(NSString *)title imageName:(NSString *)imageName selectImageName:(NSString *)selectImageName
{
    UINavigationController *navVC = [[UINavigationController alloc] initWithRootViewController:viewController];
    viewController.view.backgroundColor = [UIColor colorWithRed:arc4random_uniform(255)/255.0 green:arc4random_uniform(255)/255.0 blue:arc4random_uniform(255)/255.0 alpha:1.0];
    viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"item.png"] style:UIBarButtonItemStylePlain target:self action:@selector(tabHiddenOrShow)];
    [array addObject:navVC];
    
    NSDictionary *dict = @{@"title":title,
                           @"image":imageName,
                           @"selectImage":selectImageName
                           };
    [self.tabItems addObject:dict];
}

- (void)tabHiddenOrShow
{
    [self.tabBarController.tabBar setHidden:YES];
    self.hidden = !self.isHidden;
    
    if (self.lefeView == nil) {
        self.lefeView = [[LeftView alloc] initWithFrame:CGRectMake(-LEFT_WIDTH, 0, LEFT_WIDTH, [UIScreen mainScreen].bounds.size.height)];
        self.lefeView.delegate = self;
        self.lefeView.itemArray = self.tabItems;
        [[UIApplication sharedApplication].keyWindow addSubview:self.lefeView];
    }
    if (self.bgView == nil) {
        self.bgView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
        self.bgView.backgroundColor = [UIColor colorWithWhite:0.3 alpha:0.5];
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
        [self.bgView addGestureRecognizer:tap];
    }
    
    CGRect leftFrame = self.lefeView.frame;
    if (self.isHidden == YES) {
        leftFrame.origin.x = -LEFT_WIDTH;
        [self.bgView removeFromSuperview];
    } else {
        [[UIApplication sharedApplication].keyWindow insertSubview:self.bgView belowSubview:self.lefeView];
        leftFrame.origin.x = 0;
    }
    [UIView animateWithDuration:0.5 animations:^{
        self.lefeView.frame = leftFrame;
        [self.view setNeedsLayout];
    }];
}

- (void)tapClick:(UITapGestureRecognizer *)tap
{
    [self tabHiddenOrShow];
}


#pragma mark - LeftViewDelegate
-(void)didClickChildButton:(int)selectedIndex
{
    self.selectedIndex = selectedIndex;
    [self tabHiddenOrShow];
}


#pragma mark - set & get
-(NSMutableArray *)tabItems
{
    if (_tabItems == nil) {
        _tabItems = [NSMutableArray array];
    }
    return _tabItems;
}

@end

在你需要添加UITabController的地方使用

我这里在APPDELAGE里使用到的

self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    
    MainTabBarController *mainVC = [[MainTabBarController alloc]init];
    self.window.rootViewController = mainVC;
    
    [self.window makeKeyAndVisible];

详细代码请看:
https://github.com/Vanessa1990/SideBar