IOS之UITabBarController

2019-11-14 18:08:27

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　　在学习IOS开发过程中，针对于UITabBarController的使用也不少出现，UITabBarController和UINavigationController类似,UITabBarController也可以轻松地管理多个控制器,轻松完成控制器之间的切换

　　使用步骤：

1初始化UITabBarController
2设置UIWindow的rootViewController为UITabBarController
3创建相应的子控制器（viewcontroller）
4把子控制器添加到UITabBarController

　　代码如下

//初始化视图控制器    UIViewController * vc1=[[UIViewController alloc] init];    vc1.view.backgroundColor=[UIColor redColor];          UIViewController * vc2=[[UIViewController alloc] init];    vc2.view.backgroundColor=[UIColor greenColor];            UIViewController * vc3=[[UIViewController alloc] init];    vc3.view.backgroundColor=[UIColor yellowColor];        UIViewController * vc4=[[UIViewController alloc] init];    vc4.view.backgroundColor=[UIColor orangeColor];        UIViewController * vc5=[[UIViewController alloc] init];    vc5.view.backgroundColor=[UIColor purpleColor];           //为tabbarController添加控制器    UITabBarController * tabVC=[[UITabBarController alloc] init];    tabVC.delegate=self;    tabVC.viewControllers=@[vc1,vc2,vc3,vc4,vc5 ];            //初始化系统UITabBarItem    UITabBarItem * item1=[[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:101];    vc1.tabBarItem=item1;        UITabBarItem * item2=[[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemBookmarks tag:102];    vc2.tabBarItem=item2;      //初始化带图片的UITabBarItem    UIImage * selImage=[UIImage imageNamed:@"tabbar_cate_f"];    selImage=[selImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];    UITabBarItem * item3=[[UITabBarItem alloc] initWithTitle:@"最近" image:[UIImage imageNamed:@"tabbar_cate"] selectedImage:selImage];    NSDictionary * dic=@{NSFontAttributeName:[UIFont systemFontOfSize:20],NSForegroundColorAttributeName:[UIColor redColor]};    [item3 setTitleTextAttributes:dic forState:UIControlStateSelected];    vc3.tabBarItem=item3;        //初始化带图片的UITabBarItem    UITabBarItem * item4=[[UITabBarItem alloc] initWithTitle:@"你好" image:[UIImage imageNamed:@"tabbar_fov"] tag:104];    vc4.tabBarItem=item4;         UITabBarItem * item5=[[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemSearch tag:105];    vc5.tabBarItem=item5;       //将TabBarController设置为窗口的根控制器self.window.rootViewController=tabVC;

2.UITabBar自己有一些方法是可以改变自身状态，但是对于UITabBarController自带的tabBar还是不能满足需求的,因此们需要用到自定义

　　思路如下：我们需要自定义一个tabbar，这里我们用UIView来替代，同时我们需要在tabbar上面来增加Item，从而达到点击控制视图控制器的目的。Item涉及到点击事件因此我们可以考虑用Button来完成，同时在button上面添加图标和标题。

　　1 我们自定义类JRTabBarController.h

　　2 分别实现三个方法

代码如下

#PRagma mark - loadVC- (void) _loadVC{        self.tabBar.hidden=YES;        //1 创建视图控制器    JRViewController * vc1=[[JRViewController alloc] init];            UIViewController * vc2=[[UIViewController alloc] init];    vc2.view.backgroundColor=[UIColor greenColor];        UIViewController * vc3=[[UIViewController alloc] init];    vc3.view.backgroundColor=[UIColor yellowColor];        UIViewController * vc4=[[UIViewController alloc] init];    vc4.view.backgroundColor=[UIColor blueColor];         self.viewControllers=@[vc1,vc2,vc3,vc4];    }#pragma mark - _makeTabBar- (void)_makeTabBar{        //1 >定制tabbar    UIView * bgview=[[UIView alloc] initWithFrame:CGRectMake(0, kHeight-49, kWidth, 49)];    bgview.backgroundColor=[UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];    [self.view addSubview:bgview];        //2 >定制btn    CGFloat space=(kWidth-2*kLeftSpace-5*kBtSize)/4.0+kBtSize;        for(int i=0;i<5;i++){                NSDictionary * dic=_array[i];        //1 初始化button大小        JRButton * button= [[JRButton alloc] initWithFrame:CGRectMake(kLeftSpace+i*space, 49/2.0-kBtSize/2.0, kBtSize, kBtSize)];                //2 初始化button的标题和图片        [button initButtonWithTitle:dic[@"title"] andImage:dic[@"image"]];                //3 为button 设置tag 和代理        button.tag=i;        button.delegate=self;        [bgview addSubview:button];                //4 将button 加入到数组，来调整选中背景的位置        [_btArray addObject:button];                    }        //3 >增加选中图标    _selectView=[[UIImageView alloc] initWithFrame:CGRectMake(10, 49/2.0-(kBtSize+2)/2.0, kBtSize+4, kBtSize+4)];    UIButton * button=_btArray[0];    _selectView.center=button.center;    _selectView.image=[UIImage imageNamed:@"bg"];    [bgview addSubview:_selectView];    [bgview sendSubviewToBack:_selectView];    }#pragma mark - 加载数据- (void) _loadData{        _btArray=[NSMutableArray array];        NSDictionary * dic1=@{@"title":@"电影",@"image":[UIImage imageNamed:@"movie_cinema"]};    NSDictionary * dic2=@{@"title":@"新闻",@"image":[UIImage imageNamed:@"msg_new"]};    NSDictionary * dic3=@{@"title":@"top",@"image":[UIImage imageNamed:@"star_top250"]};    NSDictionary * dic4=@{@"title":@"影院",@"image":[UIImage imageNamed:@"icon_cinema"]};    NSDictionary * dic5=@{@"title":@"更多",@"image":[UIImage imageNamed:@"more_select_setting"]};        _array=@[dic1,dic2,dic3,dic4,dic5];    }

　　2、这里还有一个需要完成的功能就是点击事件，当每个Item被点击的时候我们需要进行视图控制器的切换，在切换视图控制器的同时我们还需要控制黑色背景小图片的移动，下面我们来实现这个方法

#pragma mark - ButtonDelegate- (void)changePage:(NSInteger)index{        //1 改变选中图片    UIButton * button=_btArray[index];    [UIView beginAnimations:nil context:nil];    _selectView.center=button.center;    [UIView commitAnimations];        //2 切换视图控制器    self.selectedIndex=index; }

3 、Item的定义，这里我们自定义一个button用来自定义Item,分别在button上面增加图片和标题来达到我们的效果，同时，通过代理实现控件的控制，代码如下：

/** *  初始化图片和标题 * *  @param title 标题 *  @param image 图片 */- (void) initButtonWithTitle:(NSString *) title andImage:(UIImage *) image{    if(self) {       //1> 添加Image        UIImageView * imageView=[[UIImageView alloc] initWithFrame:CGRectMake(self.frame.size.width/2.0-kImageSize/2.0, 2, kImageSize, kImageSize)];        imageView.contentMode=UIViewContentModeScaleaspectFit;        imageView.image=image;        [self addSubview:imageView];               //2> 添加title        UILabel * label=[[UILabel alloc] initWithFrame:CGRectMake(0, kImageSize, self.frame.size.width, self.frame.size.height-kImageSize)];        label.text=title;        label.textColor=[UIColor whiteColor];        label.textAlignment=NSTextAlignmentCenter;        label.font=[UIFont boldSystemFontOfSize:13];        [self addSubview:label];        [self addTarget:self action:@selector(showClick) forControlEvents:UIControlEventTouchUpInside];        }    }