Question

我是iOS开发新手。我有一个启动画面，想用初始视图替换它，我的意思是图像和两个按钮。如何设置初始视图？我在iOS 4上使用Xcode 4.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;
}

但是这段代码没有显示启动画面，它直接带我到HomeViewController，请帮忙。

Answer 1

（警告，基于ARC的代码......别忘了发布）我这样做了：

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

然后我更改didFinishLaunchingWithOption以仅显示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SplashScreenViewController中，添加指向您的应用appDelegate的属性appDelegate。

然后，在你的闪屏上做你想做的事（登录，按钮等......）在此示例中，这是一个简单的登录按钮。当您点击该按钮时，它会将一个功能调入您的appDelegate

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

此功能现在将加载tabBarController并删除splashcreen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;

这就是诀窍

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

带有按钮的iOS启动画面

1 个答案: