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You can follow this same technique with any Handoff-compatible app. To go the other direction — moving content from a Mac to an iOS device — follow the steps appropriate for the version of the operating system you have. We'll use getting directions via the Maps app as the example, but like with the previous section, any Handoff-compatible app will work in basically the same way.
If You're Running iOS 8. Handoff also appears in the Dock on iPads running iOS 11 and up. By Sam Costello. Sam Costello. Sam Costello has been writing about tech since His writing has appeared in publications such as CNN. Tweet Share Email. Was this page helpful? Thanks for letting us know! Email Address Sign up There was an error. Please try again. You're in! However, only the activity object corresponding to the frontmost tab or window is current at a given time, and only the current activity is available for continuation.
In addition, you can use properties such as keywords and contentAttributeSet to provide rich information about an activity to display in search results. The NSUserActivity class defines properties you use to specify the eligibility of an activity for various uses. An NSUserActivity object also has a userInfo dictionary to contain its state data and a flag named needsSave that supports lazy updating of its state by its delegate. Once the system calls this method, it resets needsSave to NO. Change this value to YES if something happens that changes the userInfo or other data-bearing properties again.
This arrangement is preferred if it works for your user activity. Although there are minor behavioral differences between the platforms, the basic mechanism, which enables apps to save and restore user activities, is the same, and the APIs are the same. That is, you provide an activity type for each document type supported by your document-based app. Multiple document types can have the same activity type. It does so if the app delegate method application:continueUserActivity:restorationHandler: returns NO or is unimplemented.
Your responder subclass must override the updateUserActivityState: method to add state data to the user activity object. If multiple responders share a single NSUserActivity object, they all receive an updateUserActivityState: callback when the system updates the user activity object. A responder can set its userActivity property to nil to disassociate itself from an activity. When an NSUserActivity object managed by the app framework has no more associated responders or documents, it is automatically invalidated.
For more information, see Adopting Handoff in Responders. The app delegate is the primary entry point for continuing a user activity in a non-document-based app. The app lets the user know that the activity will continue shortly. Meanwhile, the NSUserActivity object is delivered when the delegate receives an application:continueUserActivity:restorationHandler: message.
You should implement this method to configure your app in such a way that it can resume the activity represented by the user activity object. The application:continueUserActivity:restorationHandler: message includes a block, the restoration handler, that you can optionally call if your app uses auxiliary responder or document objects to perform the resuming user activity. Create these objects or fetch them if cached and pass them to the restoration handler in its NSArray parameter.
The system then sends each object a restoreUserActivityState: message, passing the user activity object. For more information about using this restoration handler, see the description of the application:continueUserActivity:restorationHandler: method in NSApplicationDelegate Protocol Reference. When you continue an activity that was chosen in a search result, you should regenerate the keywords for the activity, if appropriate, because the activity you receive may not have the same properties as the activity that was originally created.
If you do not implement application:continueUserActivity:restorationHandler: or return NO from it, and your app is document-based, AppKit can automatically resume the activity, as described in Supporting User Activity in Document-Based Apps. For more details, see Continuing an Activity.
With Handoff, you can start working on one device, then switch to another nearby device and pick up where you left off. In cellular telecommunications, handover, or handoff, is the process of transferring an ongoing call or data session from one channel connected to the core network to another channel. With Handoff, you can start something on one Apple device (Mac, iPhone, iPad or Apple Watch) and then seamlessly pick it up on another.