I am totally new to app development. I have to make a simple app( sort of a to-do list). I need this app to work on mac desktops and also on ipads and iphones. I need to know how to make a GUI on a mac.will the same prog. be compatible on all 3  devices?

what will you recommend me to learn first? i am getting acquanited with objective C language(done C++ before). but no experience of gui.

It's possible. Just create a second target of the appropriate type and then change the "Base SDK" build setting. Then make sure to add all the necessary files. If you want to build both at the same time, create an aggregate target. So my mean you have to maintain two targets one for iPhone / iPad and Mac also....... May be it helpful to you......

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