IOS之UITabBarController

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：

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];          }      }