The Core iOS Developer’s Cookbook, Fifth Edition

User Permission Descriptions

To protect privacy, the end user must explicitly permit your applications to access calendar data, the camera, contacts, photos, location, and other functionality. To convince the user to opt in, it helps to explain how your application can use this data and describe your reason for accessing it. Assign string values to the following keys at the top level of your Info.plist file:

NSBluetoothPeripheralUsageDescription

NSCalendarsUsageDescription

NSCameraUsageDescription

NSContactsUsageDescription

NSLocationUsageDescription ...