1.What is the difference between SensorEvent and SensorEventListener? 2.List and explain views and controllers in iOS 3.List the steps to create the Xcode Project.

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1.What is the difference between SensorEvent and SensorEventListener?
2.List and explain views and controllers in iOS
3.List the steps to create the Xcode Project.
4.Write down the steps along with the code for monitoring the battery.
5.Save a string into the NSUserDefaults and then Read it back.