It is the first time I am going to sumbmit my app. I know from a document that launch images should be specified, but I have created my own launch view (a viewcontroller wit
To submit your app to the app store, you need a launch image. You don't need to build it in Interface Builder or programatically, it's just a picture. You can do this quickly and easily by running the iPhone Simulator and taking a screenshot. Then all you have to do is copy the image into your target folder and specify that image to be used as a launch image:
Just drag your image file into the box.
Here is the apple documentation on image requirements for applications: Custom Icon and Image Creation Guidelines.