I am new to iOS app development.

I want to develop a popup screen, that should popup when a button is pressed. In this popup I want to show a Login screen, where user will enter username and password and will submit the credentials. I have following requirements to be fulfilled.

1. It should support all iOS 5.1 and upwards.
2. It should also support any device orientation.
3. It should work for both iPhone and iPad.
4. It is to be delivered in the form of a library `.a file`.
5. It will contain a logo(image) also.

I am not able to find out how should i proceed for this, for BB10 I have used `sheets` for the same purpose. 

Any suggestion on how to develop this for the iOS apps.

thanks.