Setting the Datepicker in IOS to pick only the Month and Year

Your question mentions date and year so I it seemed like UIDatePickerModeDate would suffice but as you are looking for month and year which is not an available option. I suggest you consider using a two component UIPickerView object.

Original Answer

You can do this by changing the Mode property under Date Picker to Date in the Attributes Inspector in the right bar ( Cmd + Option + 4 ). You can also do this programmatically,

datePicker.datePickerMode = UIDatePickerModeDate;