iphone - 在显示启动画面时从 web 服务加载数据

Question

我正在尝试在显示初始屏幕时从 Web 服务加载一些数据。

我正在尝试使用下面的代码，但我仍然无法找到合适的解决方案。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self backgroundtask];
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]         autorelease];
    splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    splashView.image = [UIImage imageNamed:@"Default.png"];
    [self.window addSubview:splashView];
    [self.window bringSubviewToFront:splashView];

    ViewController *masterViewController = [[[ViewController alloc]         initWithNibName:@"ViewController" bundle:nil] autorelease];
    self.navigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease];
    self.window.rootViewController = self.navigationController;
    [self.window makeKeyAndVisible];
}

Answer 1

如果要显示启动画面，只需将名为“default.png”的图像文件放入资源中。该应用程序将在任何视图加载之前在启动时自动显示。并且有didFinishLaunchingWithOptions你的代码的其余部分

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


 ViewController *masterViewController = [[[ViewController alloc]         initWithNibName:@"ViewController" bundle:nil] autorelease];
 self.navigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease];
 self.window.rootViewController = self.navigationController;
 [self.window makeKeyAndVisible];
}

Answer 2

做这个：

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

  self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]         autorelease];
  //No need of splash View as u add Default.png to bundle and application will autimatically take it as Launch Image
  [self backgroundtask];
  ViewController *masterViewController = [[[ViewController alloc]         initWithNibName:@"ViewController" bundle:nil] autorelease];
  self.navigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease];
  self.window.rootViewController = self.navigationController;
  [self.window makeKeyAndVisible];
}