An Action extension helps users view or transform content originating in a host app. For example, an Action extension might help users edit an image in a document that they’re viewing in a text editor. Another type of Action extension might let users view a selected item in a different way, such as viewing an image in a different format or reading text in a different language.
Action
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The system offers an Action extension to users only when the extension declares it can work with the type of content a user is currently using. For example, if an Action extension declares it works only with text, it isn’t made available when a user is viewing images.
To learn how to declare the types of content an Action extension can work with, read Declaring Supported Data Types for a Share or Action Extension).
Before you begin
Make sure the Action extension point is appropriate for your purpose. Action extensions enable targeted, lightweight tasks that display or change content. If you want to help users share content on a social website or give users updates on information they care about, the Action extension point is not the right choice. Apps downloaded mac terminal.
To find out about other types of app extensions you can create, see Table 1-1.
![]() Understand Action Extensions
Action extensions behave differently depending on the platform. In OS X, an Action extension:
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In iOS, an Action extension:
On both platforms, users get access to Action extensions in the system-provided UI. In iOS, an Action extension is listed in the action area of the activity view controller that appears when users tap the Share button. In OS X, there are a few ways in which users can reveal a list of Action extensions. For example, users can:
Note
In OS X, an Action extension that enables content viewing may work on multiple selected items, but an extension that enables editing can work on only one item at a time.
Use the Xcode Action Extension Template
The Xcode Action extension template provides default source files for the principal view controller class (called
ActionViewController ), an Info.plist file, and an interface file (that is, a storyboard or xib file).
By default, the Action template supplies the following
Info.plist keys and values, shown here for an OS X target:
To specify the task your OS X Action extension enables, use one of the following values for the required
NSExtensionServiceRoleType key:
An Action extension uses the view controller’s
extensionContext property to get an NSExtensionContext object. In OS X, the extension context contains the user’s selected content as well as the size and position of that content.
In iOS, an extension context has content specified explicitly by the host app; this can, at the discretion of the host, include user selected content.
To learn more about the extension context, see Respond to the Host App’s Request.
Design the UI
Important
For best results, use Auto Layout to design the UI of an Action extension.
iOS. If you want to present your iOS Action extension full screen, add the following key-value pair to the extension’s
NSExtension dictionary:
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OS X. Consider the size and position of the selected content in the host app when specifying the size and position of the Action extension’s view.
Use the
preferredContentSize property of the NSViewController class to specify the extension view’s preferred size, based on the size of the selected content. (You can also specify minimum and maximum sizes for the extension’s view, to ensure that a host app doesn’t make unreasonable adjustments to your view.) To specify a preferred position for the extension view, set the preferredScreenOrigin https://cdsdgxp.weebly.com/how-to-update-fitbit-app-on-mac.html. property to the lower-left corner of the extension’s view.
Returning Edited Content to the Host
On both platforms, an Action extension uses an Listing 5-1Sending edited items to the host app
NSExtensionContext method to send the user’s edits to the host app. Listing 5-1 shows code that returns edited text to the host app when the user chooses a Done button.
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