Inherits from NSObject
Conforms to INKActivityViewControllerDefaultsDelegate
Declared in INKHandler.h

Overview

INKHandler is the base class for shared groups of behavior for a class of third-party applications. You cannot use the INKHandler class directly. It instead defines the common interface and behavioral structure for all its subclasses.

Subclassing Notes

If you are defining URL schemes for a new discrete class of third-party applications (such as “web browsers” or “mapping applications”, you may want to create your own INKHandler subclass. All custom methods you create that perform actions should ultimately return a UIActivityController created by calling performCommand:withArguments:.

Tasks
  •   defaultApp

    The name of the currently-registered default app. This app might not be able to handle all actions; in that case, a fallback activity view will be shown.

         property
  •   disableSettingDefault

    If YES, when this handler is presented as an activity sheet, it will never show the “Remember My Choice” toggle.

         property
  •   showFirstPartyApp

    By default, if a handler has both a first-party app and an in-app modal view (e.g. Safari and an in-app UIWebView), the first-party app won’t be displayed.

         property
  •   disableInAppOption

    If a handler has an “In App” option (e.g. an in-app UIWebView for INKBrowserHandler), setting this to YES will disable it

         property
  •   useFallback

    If no apps are available to perform a given task, if fallback is set to YES then the handler will attempt to perform the task in a web browser instead. YES by default.

         property
  •   alwaysShowActivityView

    By default, if there is only one valid application, a handler will automatically open that app instead of showing a INKActivityViewController. Setting this to YES overrides that behavior and always shows an activity view.

         property
  •   useSystemDefault

    If true, this handler object will use a system-provided default if the user has not provided one.

         property
  • – canPerformCommand:

    Returns whether or not an action can be performed at all.
  • – performCommand:withArguments:

    Opens a third-party application to perform some task. If there is only one application installed that can respond to that command, it will open that app with the correct URL. Otherwise, it will create a UIActivityViewController to prompt the user to pick an app.
  • + category

    The category of activity handled by the handler. This is used to group handlers in INKDefaultsViewController
  • + name

    The name of the class of applications represented by the handler.
  • – promptToSetDefault

    Prompts the user to pick a default application for the handler

Properties

alwaysShowActivityView

@property (nonatomic, assign) BOOL alwaysShowActivityView
Discussion

By default, if there is only one valid application, a handler will automatically open that app instead of showing a INKActivityViewController. Setting this to YES overrides that behavior and always shows an activity view.

This is mostly useful for demo purposes (e.g. running in the simulator).

Declared In

INKHandler.h

defaultApp

@property (readonly) NSString *defaultApp
Discussion

The name of the currently-registered default app. This app might not be able to handle all actions; in that case, a fallback activity view will be shown.

Declared In

INKHandler.h

disableInAppOption

@property (nonatomic, assign) BOOL disableInAppOption
Discussion

If a handler has an “In App” option (e.g. an in-app UIWebView for INKBrowserHandler), setting this to YES will disable it

Declared In

INKHandler.h

disableSettingDefault

@property (assign, nonatomic) BOOL disableSettingDefault
Discussion

If YES, when this handler is presented as an activity sheet, it will never show the “Remember My Choice” toggle.

Declared In

INKHandler.h

showFirstPartyApp

@property (nonatomic, assign) BOOL showFirstPartyApp
Discussion

By default, if a handler has both a first-party app and an in-app modal view (e.g. Safari and an in-app UIWebView), the first-party app won’t be displayed.

Setting this to YES will show the first-party app as an option.

Declared In

INKHandler.h

useFallback

@property (nonatomic) BOOL useFallback
Discussion

If no apps are available to perform a given task, if fallback is set to YES then the handler will attempt to perform the task in a web browser instead. YES by default.

Declared In

INKHandler.h

useSystemDefault

@property (nonatomic, assign) BOOL useSystemDefault
Discussion

If true, this handler object will use a system-provided default if the user has not provided one.

To be clear: this means that performing an action with this handler will NEVER prompt the user to set a preference. In order to allow user preferences if this option is set, you will need to give users a way to explicitly set preferences, either by using an INKDefaultsViewController or creating your own interface.

Declared In

INKHandler.h

Class Methods

category

+ (INKHandlerCategory)category
Discussion

The category of activity handled by the handler. This is used to group handlers in INKDefaultsViewController

Declared In

INKHandler.h

name

+ (NSString *)name
Discussion

The name of the class of applications represented by the handler.

Declared In

INKHandler.h

Instance Methods

canPerformCommand:

- (BOOL)canPerformCommand:(NSString *)command
Discussion

Returns whether or not an action can be performed at all.

Parameters

command

The name of a command to perform, corresponding with the keys in each application’s plist.

Return Value

YES if the user has at least one application installed that responds to the given command.

Declared In

INKHandler.h

performCommand:withArguments:

- (INKActivityPresenter *)performCommand:(NSString *)command withArguments:(NSDictionary *)args
Discussion

Opens a third-party application to perform some task. If there is only one application installed that can respond to that command, it will open that app with the correct URL. Otherwise, it will create a UIActivityViewController to prompt the user to pick an app.

Parameters

command

The name of a command to perform, corresponding with keys in each application’s plist.

args

The dictionary of arguments used to construct a URL based on the templates defined for each URL scheme.

Return Value

A INKActivityPresenter object to present.

Declared In

INKHandler.h

promptToSetDefault

- (INKActivityPresenter *)promptToSetDefault
Discussion

Prompts the user to pick a default application for the handler

Return Value

An INKActivityPresenter object to present.

Declared In

INKHandler.h