如何自己寫一個容器來實現viewController之間的切換

</pre>視圖控制器：ViewController<p></p><p><span style="font-size:18px"></span></p><p><span style="font-size:18px">在iOS程序開發中官方提供了四種切換ViewController的方法：</span></p><p><span style="font-size:18px"></span></p><p><span style="font-size:18px">01   模態視圖切換</span></p><p><span style="font-size:18px">02    <span style="font-family:Menlo">UINavigationController</span></span></p><p><span style="font-size:18px"><span style="font-family:Menlo">03 </span><span style="font-family:Menlo">UITabBarController</span></span></p><p><span style="font-size:18px"><span style="font-family:Menlo">04 </span><span style="color:rgb(52,149,175); font-family:Menlo">addChildViewController</span></span></p><p><span style="font-size:18px"><span style="color:rgb(52,149,175); font-family:Menlo">   在子視圖控制中如何獲取容器視圖控制器呢？</span></span></p><p><span style="font-size:18px"><span style="color:rgb(52,149,175); font-family:Menlo"><span style="white-space:pre">	</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 18px; font-family: 'Heiti SC Light'; color: rgb(0, 143, 0);"><span style="font-family: 'Helvetica Neue';"><span style="white-space:pre">	</span>//</span>找到當前視圖控制器所在的容器</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 18px; font-family: Menlo; color: rgb(52, 149, 175);"><span style="color: #000000">    </span>PSBMedicalViewController<span style="color: #000000"> * mvc = (</span><span style="font-family: 'Helvetica Neue'; color: rgb(4, 51, 255);">id</span><span style="color: #000000">)</span><span style="font-family: 'Helvetica Neue'; color: rgb(4, 51, 255);">self</span><span style="color: #000000">.</span>parentViewController<span style="color: #000000">;</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 18px; font-family: Menlo; min-height: 21px;">    </p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 18px; font-family: Menlo; color: rgb(52, 149, 175);"><span style="color: #000000">    [mvc </span>popRightDrawer<span style="color: #000000">];</span></p><p><span style="font-size:18px; color:#cc0000"><span style="font-family:Menlo">第四種方式我們用來自定義容器時，切換ViewController。</span></span></p><p><span style="font-size:18px"><span style="color:rgb(52,149,175); font-family:Menlo"></span></span></p><p><span style="font-size:18px"><span style="font-family:Menlo">視圖控制器有兩類：1：顯示的視圖控制器 2：不顯示的視圖控制器，用來管理其他子視圖控制器的視圖控制器。稱爲：容器視圖控制器。</span></span></p><p></p><p><span style="white-space:pre">	</span><span style="font-size:24px;color:#cc0000;">注意：自定義的容器視圖控制器，是不能被釋放的。爲此，有多種方式讓其不被釋放，1：單例，2：交給NavigationBar中ViewControllers這個數組。</span></p><p></p><p></p><pre name="code" class="objc">#import "PSBRootViewController.h"

/**自定義的容器控制器，管理其他的視圖控制器，本身不顯示*/
@interface AZMedicalViewController : PSBRootViewController


//彈出右側的抽屜
-(void)popRightDrawer;

//收起右側抽屜
-(void)hideRightDrawer;
@end

#import "AZMedicalViewController.h"
#import "AZFirstLayerModel.h"

@interface AZMedicalViewController ()
{
    //判斷當前抽屜是否顯示
    BOOL _isDrawerShow;

}

@end

@implementation AZMedicalViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
   
    //創建相關子視圖
   [self createSubView];
    
    //在這裏，添加被管理的子視圖控制器
    [self createChildViewcontrollers];
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
//創建相關子視圖
-(void)createSubView
{
    PSBBarButtonItem *backButton=[PSBViewFactory backButton];
    [backButton addTarget:self action:@selector(backButtonOnClick:) forControlEvents:UIControlEventTouchUpInside];
    [_nvgItem addSubview:backButton];
}


-(void)backButtonOnClick:(PSBBarButtonItem *)item
{
    
    if (!_isDrawerShow)
    {
       [self.navigationController popViewControllerAnimated:YES];
    }
    else
    {
        [self hideRightDrawer];
    }
}

#pragma mark -- 容器視圖控制器的相關方法
//添加子視圖控制器
-(void)addChildViewControllers:(NSArray *)vcs
{
    if (vcs.count!=2) {
        return;
    }
    
    for (NSUInteger i=0; i<2; i++)
    {
        PSBRootViewController *vc=vcs[i];
        
        //讓出導航條
        CGRect frame=self.view.bounds;
        frame.origin.y += 64;
        frame.size.height -=64;
        if (i==0) {
            vc.view.frame=frame;
        }
        else
        {
            
            frame.size.width=frame.size.width/2;
            frame.origin.x=self.view.bounds.size.width;
            vc.view.frame=frame;
        }
        
        [self.view addSubview:vc.view];
        //但是需要注意：如果在ARC下，self.view 只添加了vc.view的話，那麼arc會自動釋放掉VC。
        
        //解決辦法：
        //官方視圖控制器，提供方法保留子視圖控制器。
        //使當前視圖控制器作爲容器，子視圖控制器不會被釋放。其實內部實現也是很簡單，就是一個數組，管理着這些子視圖控制器，強引用。
        [self addChildViewController:vc];
        
    }
 
}

//彈出右側的抽屜
-(void)popRightDrawer
{
    if (_isDrawerShow) {
        return;
    }
    
    [UIView beginAnimations:nil context:NULL];
    
    [UIView setAnimationDuration:0.25];
    
    //設置動畫結束的效果
    PSBRootViewController *vc1=self.childViewControllers[0];
    CGRect frame=vc1.view.frame;
    frame.size.width=frame.size.width/2;
    vc1.view.frame=frame;
    
    PSBRootViewController *vc2=self.childViewControllers[1];
    frame=vc2.view.frame;
    frame.origin.x=vc1.view.frame.size.width;
    vc2.view.frame=frame;

    [UIView commitAnimations];
  
    _isDrawerShow=YES;
}

//收起右側抽屜
-(void)hideRightDrawer
{
    if (!_isDrawerShow) {
        return;
    }
    [UIView beginAnimations:nil context:NULL];
    
    [UIView setAnimationDuration:0.25];
    
    //設置動畫的效果
    CGRect frame=self.view.bounds;
    frame.origin.y +=64;
    frame.size.height -=64;
    
    PSBRootViewController *vc1=self.childViewControllers[0];
    vc1.view.frame=frame;
    
    PSBRootViewController *vc2=self.childViewControllers[1];
    frame.origin.x=vc1.view.frame.size.width;
    frame.size.width=self.view.bounds.size.width/2;
    vc2.view.frame=frame;
    
    [UIView commitAnimations];
    
    _isDrawerShow=NO;
    
}


#pragma mark -- 子視圖控制器
//創建子視圖控制器
-(void)createChildViewcontrollers
{
    NSArray *tempArray=@[@"AZFirstViewController",@"AZSecondViewController"];
    id obj1,obj2;
    
    for (NSUInteger i=0; i<tempArray.count; i++)
    {
        Class cls=NSClassFromString(tempArray[i]);
        id obj=[[cls alloc] init];
        if (i) {
            obj2=obj;
        }
        else
        {
            obj1=obj;
        }
    }
    
    //添加到當前容器
    [self addChildViewControllers:@[obj1,obj2]];
}

@end

//選中了一個cell
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //找到當前視圖控制器所在的容器
    PSBMedicalViewController * mvc = (id)self.parentViewController;
    
    [mvc popRightDrawer];
}