give some screenshots to create UIBackgroundModes key in Info.plist for iOS4

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 understand开发者_如何学JAVAing...also specify what the requirements which are needed ie iPhone, OS version 4.0...

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.

In IOS 13. It would be like the list given below.

Here's the link to the documentation:

https://developer.apple.com/documentation/bundleresources/information_property_list/uibackgroundmodes

Name: "Required background modes" Type: Array of strings

Valid values:

• audio
• location
• voip
• external-accessory
• bluetooth-central
• bluetooth-peripheral
• fetch
• remote-notification
• processing