iOS----自定义的TabBarController底部导航栏

底部的模块视图 继承自UIView

CustomTabBar.h

//自定义的CustomTabBar视图   在该视图上添加 按钮
#import 
@protocol CustomTabBarDelegate 

//参数就是传递当前点击的是哪一个按钮，controller根据index来切换子视图控制器
-(void) changeViewControllerWithIndex:(NSInteger) index;

@end
@interface CustomTabBar : UIView
@property (nonatomic,assign) id  delegate;//协议代理
@end

CustomTabBar.m

//  自定义的CustomTabBar视图   在该视图上添加 按钮

#import "CustomTabBar.h"
@interface CustomTabBar ()

//数组
@property (nonatomic,strong) NSArray* btnArray;//按钮数组
@property (nonatomic,strong) NSArray* image1;//初始图片数组
@property (nonatomic,strong) NSArray* image2;//点击后图片数组
@property (nonatomic,strong) NSArray* titleArray;//下部标题

@end
@implementation CustomTabBar

#pragma mark--懒加载
//按钮数组
-(NSArray*)btnArray{

    if (!_btnArray) {
         _btnArray = [[NSArray alloc] initWithObjects:[UIButton buttonWithType:(UIButtonTypeSystem)],[UIButton buttonWithType:(UIButtonTypeSystem)],[UIButton buttonWithType:(UIButtonTypeSystem)],[UIButton buttonWithType:(UIButtonTypeSystem)],[UIButton buttonWithType:(UIButtonTypeSystem)], nil];
    }
    return _btnArray;
}
//初始图片数组
-(NSArray*)image1{
    
    //图片数据且取消渲染
    if (!_image1) {
        _image1 = [[NSArray alloc] initWithObjects:[[UIImage imageNamed:@"homePage1"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)],[[UIImage imageNamed:@"classify1"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)],[[UIImage imageNamed:@"find1"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)],[[UIImage imageNamed:@"shopping1"]imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)],[[UIImage imageNamed:@"mine1"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)], nil];
    }
    return _image1;
}
//点击后图片数组
-(NSArray*)image2{
    
    //图片数据且取消渲染
    if (!_image2) {
       _image2 = [[NSArray alloc] initWithObjects:[[UIImage imageNamed:@"homePage2"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)],[[UIImage imageNamed:@"classify2"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)],[[UIImage imageNamed:@"find2"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)],[[UIImage imageNamed:@"shopping2"]imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)],[[UIImage imageNamed:@"mine2"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)], nil];
    }
    return _image2;
}

#pragma mark--初始化方法
-(instancetype)initWithFrame:(CGRect)frame{

    //判断传递的frame高度   默认为50
    if (frame.size.height != 50) {
        frame.size.height = 50;
    }
    //默认宽度为屏宽
    frame.size.width = [UIScreen mainScreen].bounds.size.width;
    //父类继承
    self = [super initWithFrame:frame];
    //是否存在
    if (self) {
        //为当前视图添加子视图方法
        [self mySubViews];
        //背景色
        self.backgroundColor = [UIColor whiteColor];
    }
    return self;
   
}

#pragma mark---为当前视图添加子视图
-(void)mySubViews{
    //循环添加 按钮
    for (int i = 0; i < self.btnArray.count; i++) {
        //获取数组中按钮，设置按钮大小
        UIButton* btn = self.btnArray[i];
        btn.frame = CGRectMake(self.frame.size.width / 5 * i, 0, self.frame.size.width / 5, self.frame.size.height );
           //设置按钮图片  tag值    回调方法
        //判断是否为第一个
        if (i == 0) {
            [btn setImage:self.image2[i] forState:(UIControlStateNormal)];
            btn.tag = 1000 + i;
            [btn addTarget:self action:@selector(changeIndex:) forControlEvents:(UIControlEventTouchDown)];
        }else{
            [btn setImage:self.image1[i] forState:(UIControlStateNormal)];
            btn.tag = 1000 + i;
            [btn addTarget:self action:@selector(changeIndex:) forControlEvents:(UIControlEventTouchDown)];
        }
        //图片自适应大小
        btn.imageView.contentMode = UIViewContentModeScaleAspectFill;
        btn.imageView.autoresizingMask = UIViewAutoresizingFlexibleHeight;
        btn.imageView.clipsToBounds = YES;
        
        //添加按钮
        [self addSubview:btn];
    }
  
}

#pragma mark--按钮回调方法
-(void)changeIndex:(UIButton*)sender{
    NSLog(@"按钮回调方法");
    
    //恢复初始
    [self initial];
    //设置一个初始值   通过循环获取到该按钮位置
    int num = 0;
    for (int i = 0; i < self.btnArray.count; i++) {
        if (sender == [self viewWithTag:i + 1000]) {
            num = i;
        }
    }
    //更改选中按钮的状态    图片
    [sender setImage:self.image2[num] forState:(UIControlStateNormal)];
    //调用协议方法
    [self delegateAction:num];
}

#pragma mark--按钮恢复初始状态
-(void)initial{
    //循环恢复按钮初始状态
    for (int i = 0; i < self.btnArray.count; i++) {
        UIButton* btn = self.btnArray[i];
        [btn setImage:self.image1[i] forState:(UIControlStateNormal)];
    }
}

#pragma mark--需要调用协议方法
-(void)delegateAction:(int)index{
    //判断协议是否存在以及是否有协议对应方法
    if (self.delegate && [self.delegate respondsToSelector:@selector(changeViewControllerWithIndex:)]) {
        //带有选中位置参数的协议方法
        [self.delegate changeViewControllerWithIndex:index];
    }
}
@end

MyTabBarController.h

//自定义的MyTabBarController   在该TabBarController上添加自定义tabbar视图  （CustomTabBar）

#import 

@interface MyTabBarController : UITabBarController

@end

MyTabBarController.m

/自定义的MyTabBarController   在该TabBarController上添加自定义tabbar视图  （CustomTabBar）
#import "MyTabBarController.h"
#import "CustomTabBar.h"//自定义tabbar视图

@interface MyTabBarController ()

@property (nonatomic,strong) NSArray* allNavcTitleArray;//所有导航控制器的storyboard文件名
@property (nonatomic,strong) NSArray* allSBArray;//所有的storyboard文件名  (左侧文件夹中storyboard的创建名)
@end

@implementation MyTabBarController

#pragma mark--懒加载
//所有导航控制器的storyboard文件名
-(NSArray*)allNavcTitleArray{
    if (!_allNavcTitleArray) {
        _allNavcTitleArray = [[NSArray alloc] initWithObjects:@"SquareNavc",@"PrivateLetterNavc",@"ChoiceNavc",@"MineNavc", nil];
    }
    return _allNavcTitleArray;
}
//所有的storyboard文件名
-(NSArray*)allSBArray{
    if (!_allSBArray) {
        _allSBArray = [[NSArray alloc] initWithObjects:@"Square",@"PrivateLetter",@"Choice",@"Mine", nil];
    }
    return _allSBArray;
}
#pragma mark--加载视图
- (void)viewDidLoad {
    [super viewDidLoad];
    //循环添加UINavigationController  至自定义的MyTabBarController 中
    for (int i = 0; i < self.allSBArray.count; i++) {
        //获取storyboard
        UIStoryboard* SB = [UIStoryboard storyboardWithName:self.allSBArray[i] bundle:nil];
        //获取导航控制器
        UINavigationController* navc = [SB instantiateViewControllerWithIdentifier:self.allNavcTitleArray[i]];
        //添加导航控制器
        [self addChildViewController:navc];
    }
    //隐藏系统的tabBar隐藏掉
    self.tabBar.hidden = YES;
    //自定义tabbar
    //初始化自己的tabbar，并且添加到当前视图
    CustomTabBar* customTabBar = [[CustomTabBar alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height - 50, 0, 50)];
    [self.view addSubview:customTabBar];
    //声明该协议
    customTabBar.delegate = self;
}
#pragma mark--内存出错
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
#pragma mark--协议方法
-(void) changeViewControllerWithIndex:(NSInteger)index{
    NSLog(@"%ld",index);
    //跳转对应的导航控制器中
    self.selectedIndex = index;
}
@end