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[操作系统]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:

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];    }  }

 

作者:杰瑞教育
出处:http://www.cnblogs.com/jerehedu/ 
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