CFBundleURLTypes URL scheme

https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html

CFBundleURLTypes

CFBundleURLTypes (Array - iOS, macOS) contains an array of dictionaries, each of which describes the URL schemes (http, ftp, and so on) supported by the app. The purpose of this key is similar to that of CFBundleDocumentTypes, but it describes URL schemes instead of document types. Each dictionary entry corresponds to a single URL scheme. Table 7 lists the keys to use in each dictionary entry.

Table 7  Keys for CFBundleURLTypes dictionaries

Key	Xcode name	Type	Description	Platforms
CFBundleTypeRole	「Document Role」	String	This key specifies the app’s role with respect to the URL type. The value can be Editor, Viewer, Shell, or None. This key is required.	iOS, macOS
CFBundleURLIconFile	「Document Icon File Name」	String	This key contains the name of the icon image file (minus the extension) to be used for this URL type.	iOS, macOS
CFBundleURLName	「URL identifier」	String	This key contains the abstract name for this URL type. This is the main way to refer to a particular type. To ensure uniqueness, it is recommended that you use a Java-package style identifier. This name is also used as a key in the InfoPlist.strings file to provide the human-readable version of the type name.	iOS, macOS
CFBundleURLSchemes	「URL Schemes」	Array	This key contains an array of strings, each of which identifies a URL scheme handled by this type. For example, specifying the URL scheme feed makes other apps aware that this app is capable of viewing RSS content. Types of URL schemes include http, ftp, mailto, and so on.	iOS, macOS

To learn about the converse operation in iOS of declaring the URL schemes an app can open, read the description of the LSApplicationQueriesSchemes key.