Question

For my app, in xcode 4 I set a png for my launch image (in target)…but it appear only when I start app first time; is it possible to appear this launch image every time? Also when I put my app in background and I don’t kill it. Is it possible?

Answer 1

Even if quite some apps have them, there should not be a splash screen at all. Apple is clear about this in their Human Interface Guidelines:

To enhance the user’s experience at application launch, you must
provide at least one launch image. A launch image looks very similar
to the first screen your application displays. iOS displays this image
instantly when the user starts your application and until the app is
fully ready to use. As soon as your app is ready for use, your app
displays its first screen, replacing the launch placeholder image.

Supply a launch image to improve user experience.

Avoid using it as an opportunity to provide:

An “application entry experience,” such as a splash screen An About
window Branding elements, unless they are a static part of your
application’s first screen Because users are likely to switch among
applications frequently, you should make every effort to cut launch
time to a minimum, and you should design a launch image that downplays
the experience rather than drawing attention to it.

Generally, design a launch image that is identical to the first screen
of the application.

To answer your question:
You can implement the UIApplication delegate to take actions when your app did become active or will enter foreground:

- (void)applicationDidBecomeActive:(UIApplication *)application {

}


- (void)applicationWillEnterForeground:(UIApplication *)application {

}