Day.03.08 UITabBarController 自定义标签控制器

AppDelegate.m


#import "AppDelegate.h"

#import "CustomTabBarController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    
    self.window.backgroundColor = [UIColor whiteColor];
    
    [self.window makeKeyAndVisible];
    
    /*——————————————————————————————————————————————————————————————————————————————-*/
    
    UIViewController *vc0 = [[UIViewController alloc]init];
    UIViewController *vc1 = [[UIViewController alloc]init];
    UIViewController *vc2 = [[UIViewController alloc]init];
    UIViewController *vc3 = [[UIViewController alloc]init];
    UIViewController *vc4 = [[UIViewController alloc]init];

    vc0.title = @"HOME";
    vc0.tabBarItem.image = [UIImage imageNamed:@"home.png"];
    vc1.title = @"INFO";
    vc1.tabBarItem.image = [UIImage imageNamed:@"myinfo.png"];
    vc2.title = @"payticket";
    vc2.tabBarItem.image = [UIImage imageNamed:@"payticket"];
    vc3.title = @"discover";
    vc3.tabBarItem.image = [UIImage imageNamed:@"discover"];
    vc4.title = @"store";
    vc4.tabBarItem.image = [UIImage imageNamed:@"store"];
    
    UINavigationController *nav0 = [[UINavigationController alloc]initWithRootViewController:vc0];
    UINavigationController *nav1 = [[UINavigationController alloc]initWithRootViewController:vc1];
    UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:vc2];
    UINavigationController *nav3 = [[UINavigationController alloc]initWithRootViewController:vc3];
    UINavigationController *nav4 = [[UINavigationController alloc]initWithRootViewController:vc4];
    
    
    //1.
    CustomTabBarController *tbc = [[CustomTabBarController alloc]initWithSelectedImge:[UIImage imageNamed:@"选中"] tabBarBackgroundImage:[UIImage imageNamed:@"tab_bg_all"]];
    
    //2.
    tbc.viewControllers = @[nav0,nav1,nav2,nav3,nav4];
    
    tbc.selectedIndex = 2;
    
    /**
     *  分析空间功能和信息来源
     
        1.当设置viewControllers的时候 -> 按钮个数 按钮宽度
     
        2.item的image和title 来源是 -> VC控制器
     
        3.选中图片的位置 -> 点击item调用的代理方法 index
     
        4.背景图 -> 子类化得标签控制器的属性
     */
    
    self.window.rootViewController = tbc;

    
    return YES;
}


@end

CustomTabBarController.h

#import <UIKit/UIKit.h>

@class CustomTabBarItem;

@interface CustomTabBarController : UITabBarController

- (instancetype)initWithSelectedImge:(UIImage *)selectedImage tabBarBackgroundImage:(UIImage *)bgImage;

@end

@interface CustomTabBarItem : UIButton

/**
 *  通过frame和tabBarItem创建按钮的方法
 */

- (instancetype)initWithFrame:(CGRect)frame tabBarItem:(UITabBarItem *)tabBarItem;

@end

CustomTabBarController.m

#import "CustomTabBarController.h"

#define KScreenWidth [UIScreen mainScreen].bounds.size.width

#define KScreenHeight [UISreen mainScreen].bounds.size.height

@interface CustomTabBarController ()

@property (nonatomic,strong) UIView *customTabBar;

@property (nonatomic,strong) UIImage *selectImg;

@property (nonatomic,strong) UIImage *bgImg;//私有属性保存背景图片

@property (nonatomic,strong) UIImageView *selectIV;//选中item背景图片视图

@end

@implementation CustomTabBarController


- (void)viewWillAppear:(BOOL)animated{

    [super viewWillAppear:animated];
    
    _selectIV.frame = CGRectMake(10 +self.selectedIndex *KScreenWidth/self.viewControllers.count, 5, KScreenWidth/self.viewControllers.count -20, 44);
}

- (instancetype)initWithSelectedImge:(UIImage *)selectedImage tabBarBackgroundImage:(UIImage *)bgImage{

    if (self = [super init]) {
        
        _selectImg = selectedImage;
        
        _bgImg = bgImage;
    }
    return self;
}

//重
- (void)setViewControllers:(NSArray<__kindof UIViewController *> *)viewControllers{

    [super setViewControllers:viewControllers];
    /**
     *  
     执行完上面的方法
     
     可以得到当前本控制器管理的视图控制器个数
     
     1.移除原有的按钮 tabbarItem
     2.添加自定义的 tabbarItem
     3.更改背景图片
     4.自定义的选中图片
     */
    
    [self removeTabBarButtons];
    
    [self createNewTaBar];
    
    [self createTabBarButton];
    
}

#pragma mark --1.移除原有的所有tabBarButton
/**
 *  1.移除tabbar上所有的tabbarItem
 */
- (void)removeTabBarButtons{

    NSLog(@"%@",self.tabBar.subviews);
    
    for (UIView *subView in self.tabBar.subviews) {
        
        /**
         *  NSClassFromString(NSString *aClassName) -> 将字符串转化为对应的类名
         
         UITabBarButton -> 标签控制器定义的内部类[tabbar上的按钮]
         */

        if ([subView isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            
            [subView removeFromSuperview];
        }
    }
}

/**
 *  2.创建新的有背景图的tabbar
 */
- (void)createNewTaBar{

    _customTabBar = [[UIView alloc]initWithFrame:CGRectMake(0, 0, KScreenWidth, 49)];
    
    _customTabBar.backgroundColor = [UIColor colorWithPatternImage:[_bgImg stretchableImageWithLeftCapWidth:160 topCapHeight:25]];
    
    [self.tabBar addSubview:_customTabBar];
}

/**
 *  3.创建标签按钮
 */
- (void)createTabBarButton{

    //1.获取控制器个数
    NSInteger count = self.viewControllers.count;
    
    //2.选中的背景图片
    _selectIV = [[UIImageView alloc]initWithFrame:CGRectMake(10, 5, KScreenWidth/count -20, 44)];
    
    _selectIV.image = _selectImg;
    
    [_customTabBar addSubview:_selectIV];
    
    /*——————————————————————————————————————————————————————————————————————————————-*/
    
    //创建按钮
    //1.根据个数创建按钮
    for (int i = 0; i <count; i++) {
        
        //计算按钮的frame
        CGRect itemFrame = CGRectMake(i *KScreenWidth/count, 0, KScreenWidth/count, 49);
        
        //获取按钮对应的控制器的item
        UITabBarItem *tabBarItem = self.viewControllers[i].tabBarItem;
        
        //创建
        CustomTabBarItem *item = [[CustomTabBarItem alloc]initWithFrame:itemFrame tabBarItem:tabBarItem];
        
        //tag值
        item.tag = 100 +i;
        
        //添加事件
        [item addTarget:self action:@selector(itemClick:) forControlEvents:UIControlEventTouchUpInside];
        
        [_customTabBar addSubview:item];
    }
    
}

- (void)itemClick:(UIButton *)item{

//切换视图控制器
    //1.获取点击按钮的index
    NSInteger index = item.tag - 100;
    
    //2.更改当前显示的VC
    self.selectedIndex = index;
    
    /*——————————————————————————————————————————————————————————————————————————————-*/
    
    //选中图片移动动画
    
    [UIView animateWithDuration:0.25 animations:^{
        
        _selectIV.frame = CGRectMake(10 +self.selectedIndex *KScreenWidth/self.viewControllers.count, 5, KScreenWidth/self.viewControllers.count -20, 44);
    }];
}



- (void)viewDidLoad {
    [super viewDidLoad];

}


@end



@implementation CustomTabBarItem

- (instancetype)initWithFrame:(CGRect)frame tabBarItem:(UITabBarItem *)tabBarItem{

    if (self = [super initWithFrame:frame]) {
        
        /**
         *  tabBarItem:包含创建item所需要的title和image
         */
        //创建ImageView Label
        
        //1.Label
        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, frame.size.width, 20)];
        
        //居中
        label.textAlignment = NSTextAlignmentCenter;
        
        //字号
        label.font = [UIFont systemFontOfSize:10];
        
        //颜色
        label.textColor = [UIColor whiteColor];
        
        //内容 --> 从tabBarItem获取
        label.text = tabBarItem.title;
        
        [self addSubview:label];
        
        //2.Image
        UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake((frame.size.width-29)/2, 20, 29, 29)];
        
        //内容模式
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        
        //图片 --> 从tabbarItem获取
        imageView.image = tabBarItem.image;
        
        [self addSubview:imageView];
    }

    return self;
}

@end
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