iPhone开发实现splash画面非常简单，做一张名为Default.png的欢迎界面图片放在Supporting Files文件夹下替换掉默认的Default.png（为了适配，需要做Default.png、Default@2x.png、Default-568h@2x.png三种尺寸各一张）。 在XXXAppDelegate.m的- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions方法中插入以下一行代码:
// Insert delay of 5 seconds befor the splash screen disappers.
[NSThread sleepForTimeInterval:5.0]; // 其实这一行代码也可以不加，因为默认情况下欢迎界面的时间只有一秒，加这一句是为了延长
欢迎界面的展示时间到5秒，时间大家可以自己定义。
例如：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]autorelease];
// Insert delay of 5 seconds befor the splash screen disappers.
[NSThread sleepForTimeInterval:5.0];
// Override point for customization after applicationlaunch.
// Add the view controller’s view to the window anddisplay.
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}