iOS SplitView/Universal需要xcode 4.2

问题描述：

我刚刚开始学习Objective-C和iOS开发，并且尝试将iPhone应用程序迁移到iPad时遇到了一些麻烦。iOS SplitView/Universal需要xcode 4.2

我一直在阅读Head First iPhone & iPad Development 2nd Edition，但第7章“迁移到iPad”已过期，因为xcode 4.2已过期。该应用程序演示了如何在表视图和详细视图中使用拆分视图。
将iOS应用程序目标从iPhone更改为Universal时，它们具有自动创建的MainWindow-iPad.xib。但是这在xcode 4.2中并没有发生。我已经在AppDelegate中以编程方式创建了一个splitview控制器。下面是代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]; 
    // Override point for customization after application launch 

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { 
     MasterViewController *firstVC = [[[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil] autorelease]; 
     self.secondVC = [[[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil] autorelease]; 

     UINavigationController *firstVCnav = [[[UINavigationController alloc] initWithRootViewController:firstVC] autorelease]; 
     UINavigationController *secondVCnav = [[UINavigationController alloc] initWithRootViewController:self.secondVC]; 

     UISplitViewController *splitVC = [[UISplitViewController alloc] init]; 
     splitVC.viewControllers = [NSArray arrayWithObjects:firstVCnav, secondVCnav, nil]; 

     self.window.rootViewController= splitVC; 
     [self.window makeKeyAndVisible]; 
     return YES; 
    }else { 
     MasterViewController *masterViewController = [[[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil] autorelease]; 
     self.navigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease]; 
     self.window.rootViewController = self.navigationController; 
     [self.window makeKeyAndVisible]; 
     return YES; 
    } 
}

的SPLITVIEW（表视图）的左侧进行良好的，但我不能让右侧（详细侧），以改变当我选择在不同行左边。这是我在MasterViewController类中的代码。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { 
     AppDelegate *splitVCdetails = [[AppDelegate alloc] init]; 
     [splitVCdetails.secondVC drinkChanged:[self.drinks objectAtIndex:indexPath.row]]; 

    }else { 
     if (!self.editing) { 
      if (!self.detailViewController) { 
       self.detailViewController = [[[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil] autorelease]; 
      } 
      self.detailViewController.drink = [self.drinks objectAtIndex:indexPath.row]; 
      [self.navigationController pushViewController:self.detailViewController animated:YES]; 
     }else { 
      AddDrinkViewController *editingDrinkVC = [[AddDrinkViewController alloc] initWithNibName:@"DetailViewController" bundle:nil]; 
      editingDrinkVC.drink = [self.drinks objectAtIndex:indexPath.row]; 
      editingDrinkVC.drinkArray = self.drinks; 

      UINavigationController *editingNavCon = [[UINavigationController alloc] initWithRootViewController:editingDrinkVC]; 

      [self.navigationController presentModalViewController:editingNavCon animated:YES]; 
      [editingDrinkVC release]; 
      [editingNavCon release]; 
     } 
    } 
}

下面是代码我在DetailViewController类

-(void)refreshView { 
    //Set up our UI with the provided drink 
    self.drinkTextLabel.text = [self.drink objectForKey:NAME_KEY]; 
    self.ingredientTextBox.text = [self.drink objectForKey:INGREDIENTS_KEY]; 
    self.directionTextBox.text = [self.drink objectForKey:DIRECTIONS_KEY]; 
} 

-(void)drinkChanged:(NSDictionary *)newDrink { 
    self.drink = newDrink; 
    [self refreshView]; 
}

请让我知道如果我需要澄清什么。

谢谢

答

我正在阅读“Head First iPhone和iPad Development”。在KevinM的代码的帮助下，我创建了一个没有xib的编程方式的UISplitController。这是我的解决方案。

这里是我在AppDelegate.m开头的代码：

#import "AppDelegate.h" 
#import "MasterViewController.h" 
#import "DetailViewController.h" 

@implementation AppDelegate 

@synthesize window = _window; 
@synthesize navigationController = _navigationController; 
@synthesize splitViewController = splitViewController_; 

- (void)dealloc 
{ 
    [_window release]; 
    [splitViewController_ release]; 
    [_navigationController release]; 
    [super dealloc]; 
} 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]; 

    // Override point for customization after application launch.  
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { 
     MasterViewController *masterViewController = [[[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil] autorelease]; 
     UINavigationController *masterNavigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease]; 

     DetailViewController *detailViewController = [[[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil] autorelease]; 
     UINavigationController *detailNavigationController = [[[UINavigationController alloc] initWithRootViewController:detailViewController] autorelease]; 

     masterViewController.splitViewDetailView = detailViewController; 

     self.splitViewController = [[[UISplitViewController alloc] init] autorelease]; 
     self.splitViewController.viewControllers = [NSArray arrayWithObjects:masterNavigationController, detailNavigationController, nil]; 

     self.window.rootViewController = self.splitViewController; 
    } 
    else { 
     MasterViewController *masterViewController = [[[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil] autorelease]; 
     self.navigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease]; 
     self.window.rootViewController = self.navigationController; 
    } 

    [self.window makeKeyAndVisible]; 
    return YES; 
}

下面是我在MasterViewController.m代码：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    if (!self.editing) { 
     if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { 
      [self.splitViewDetailView drinkChanged:[self.drinks objectAtIndex:indexPath.row]]; 
     } 
     else { 
      self.detailViewController = [[[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil] autorelease]; 
      self.detailViewController.drink = [self.drinks objectAtIndex:indexPath.row]; 
      [self.navigationController pushViewController:self.detailViewController animated:YES]; 
     } 
    } 
    else { 
     AddDrinkViewController *editingDrinkVC = [[AddDrinkViewController alloc] initWithNibName:@"DetailViewController" bundle:nil]; 
     editingDrinkVC.drink = [self.drinks objectAtIndex:indexPath.row]; 
     editingDrinkVC.drinkArray = self.drinks; 

     UINavigationController *editingNavCon = [[UINavigationController alloc] initWithRootViewController:editingDrinkVC]; 

     [self.navigationController presentModalViewController:editingNavCon animated:YES]; 
     [editingDrinkVC release]; 
     [editingNavCon release]; 
    } 
}

而且从书添加代码（方法refreshView）和页面346（属性splitViewDetailView）

iOS SplitView/Universal需要xcode 4.2

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