I need to customize the iphone keyboard. How can I do it? Also it is needed to place the return key of the keyboard with my project logo. How is it possible?
You cannot customize the apple iOS's default keyboard.
As such you can create a custom control similar to apple iOS's keyboard and make it look and customize as you want but then there ar more chances than not that your app may be rejected when you try to submit your app on the Apple's app store.
So it is not preferable to create custom keyboard.
Hope this helps you.