give some screenshots to create UIBackgroundModes

问题:

I'm new to iPhone development.I have already gone through some of the exploring pages to create UIBackgroundModes key in Info.plist for iOS4 .But it is little bit difficult to understand . Kindly provide some step by step procedure with screenshot example for easy understanding...also specify what the requirements which are needed ie iPhone, OS version 4.0...

回答1:

The UIBackgroundModes key identifies which background tasks your application supports. Its value is an array that contains one or more strings with the following values:

• audio – The application plays audible content to the user while in the background.
• location – The application keeps users informed of their location, even while running in the background.
• voip – The application provides the ability for the user to make phone calls using an Internet connection.

You can edit the Info.plist file on Xcode. To add a new key, click on the + sign and write:

iOS 4

"UIBackgroundModes" as the key, make sure the type is set to string and then in value write audio, location or voip depending on your needs:

iOS 6

"Required background modes" as the key and then set the type in drop down menu.