Question

我刚刚开始学习Objective-C和iOS开发，并且在尝试将iPhone应用程序迁移到iPad时遇到了一些麻烦。

我一直在阅读Head First iPhone＆amp; iPad开发第2版，但第7章“迁移到iPad”已经过时了xcode 4.2。该应用程序演示了如何使用带有表视图和详细视图的splitview 将iOS应用程序目标从iPhone更改为通用时，它们具有MainWindow-iPad.xib自动创建功能。但是xcode 4.2中没有发生这种情况。我在AppDelegate中以编程方式创建了一个splitview控制器。这是代码：

- (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;
    }
}

splitview的左侧（表格视图）表现良好，但是当我在左侧选择不同的行时，我无法改变右侧（细节侧）。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];
        }
    }
}

这是我在DetailViewController类中的代码

-(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];
}

如果我需要澄清任何事情，请告诉我。

谢谢

Answer 1

我也在阅读“Head First iPhone和iPad Development”。在KevinM的代码的帮助下我已经以编程方式创建了一个没有xib的UISplitController。这是我的解决方案。

以下是我在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;
}

以下是我在MasterViewController.m中的代码：

- (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];
    }
}

并在第345页上添加代码（方法refreshView）和第346页（属性splitViewDetailView）

iOS SplitView / Universal帮助需要xcode 4.2

1 个答案: