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iOS

Please help me to Understanding of the mvc

not completely clear what part on Xcode does what I know the view is where you put the buttons etc the part you see in the centre of Xcode, So I have three questions. ..... the "view" is the centre part where you put your objects and buttons .etc the "model" is on the right ? where you write your code functions etc. I think you can call your stored files from here? Mainly where is the "controller" ? I know it communicates between the model and view but Can you see the controller and do we add any code to it when writing a program . Hope you can help . many thanks