带按钮的 iOS 启动画面

Question

我是 iOS 开发新手。我有一个启动屏幕，想用初始视图替换它，我的意思是用一个图像和两个按钮。如何设置初始视图？我正在将 Xcode 4 与 iOS 4 一起使用。这是我的代码...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 

UIView *backgroundView = [[UIView alloc] initWithFrame: window.frame];
backgroundView.backgroundColor = [UIColor lightGrayColor];
[window addSubview:backgroundView];
[backgroundView release];

// Override point for customization after application launch.

DataController *appController = [DataController sharedObject];

tabController = [[UITabBarController alloc] init];

HomeViewController *hemView = [[HomeViewController alloc] init];
[hemView setTitle:@"Hem"];
hemView.tabBarItem.image = [UIImage imageNamed:@"icon_home.png"];
UINavigationController *homeNavigationController = [[UINavigationController alloc] initWithRootViewController:hemView];
[homeNavigationController.navigationBar setTintColor:[UIColor colorWithRed:(0.96) green:(0.96) blue:(0.96) alpha:0.0]];
[hemView release];


SearchViewController *sdkView = [[SearchViewController alloc] init];
[sdkView setTitle:@"Search"];
sdkView.tabBarItem.image = [UIImage imageNamed:@"icon_search.png"];
UINavigationController *sdkNavigationController = [[UINavigationController alloc] initWithRootViewController:sdkView];
[sdkNavigationController.navigationBar setTintColor:[UIColor colorWithRed:(0.96) green:(0.96) blue:(0.96) alpha:0.0]];
[sdkView release];



NSArray * arrayOfControllers = [[NSArray alloc] initWithObjects:homeNavigationController, sdkNavigationController, nil];
tabController.viewControllers = arrayOfControllers;

SplashScreenViewController *controller = [[SplashScreenViewController alloc] init];
[tabController presentModalViewController:controller animated:YES];
[controller release];


[self.window makeKeyAndVisible];
[window addSubview:tabController.view];


[homeNavigationController release];
[sdkNavigationController release];
[appController release];
return YES;
}

但是此代码不显示启动屏幕，它直接将我带到 HomeViewController ，请帮忙。

Answer 1

（警告，基于 ARC 的代码...不要忘记发布）
我是这样做的：

首先，我将 SplashScreenViewController *controller 和 tabController 作为 appDelegate 的属性。

然后我将 didFinishLaunchingWithOption 更改为仅显示 SplashScreenViewController，

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    UIView *backgroundView = [[UIView alloc] initWithFrame: window.frame];
    backgroundView.backgroundColor = [UIColor lightGrayColor];
    [window addSubview:backgroundView];
    [backgroundView release];

    // Override point for customization after application launch.

    DataController *appController = [DataController sharedObject];

    [self controller] = [[SplashScreenViewController alloc] init];

    [[self controller]setAppDelegate:self];
    self.window.rootViewController = self.controller;
    [self.window makeKeyAndVisible];
    return YES;
}

因此，在您的 SplashScreenViewController 中，添加一个指向您的应用程序 appDelegate 的属性 appDelegate代码>.

然后，在启动屏幕上执行您想要的操作（登录、按钮等...）
在此示例中，这是一个简单的登录按钮。当您单击按钮时，它会在您的 appDelegate 中调用一个函数。

- (IBAction)loginButton:(id)sender 
{
    [[self appDelegate]setMainTabBarControllerOnScreen];
}

该函数现在将加载 tabBarController 并删除启动屏幕登录屏幕

self.tabController = [[UITabBarController alloc] init];

HomeViewController *hemView = [[HomeViewController alloc] init];
[hemView setTitle:@"Hem"];
hemView.tabBarItem.image = [UIImage imageNamed:@"icon_home.png"];
UINavigationController *homeNavigationController = [[UINavigationController alloc] initWithRootViewController:hemView];
[homeNavigationController.navigationBar setTintColor:[UIColor colorWithRed:(0.96) green:(0.96) blue:(0.96) alpha:0.0]];

SearchViewController *sdkView = [[SearchViewController alloc] init];
[sdkView setTitle:@"Search"];
sdkView.tabBarItem.image = [UIImage imageNamed:@"icon_search.png"];
UINavigationController *sdkNavigationController = [[UINavigationController alloc] initWithRootViewController:sdkView];
[sdkNavigationController.navigationBar setTintColor:[UIColor colorWithRed:(0.96) green:(0.96) blue:(0.96) alpha:0.0]];

NSArray * arrayOfControllers = [[NSArray alloc] initWithObjects:homeNavigationController, sdkNavigationController, nil];
self.tabController.viewControllers = arrayOfControllers;

，这就是技巧

[[self window] addSubview:self.tabController.view];
[[self window]setRootViewController:[self tabController]];
[[[self viewController]view] removeFromSuperview];