The Handoff feature was introduced in iOS 8 allowing you to continue an activity started on one iOS device and continue that activity on another iOS device or on a Mac running OS X Yosemite.
Here’s an in-depth step-by-step tutorial from by Gabriel Theodoropoulos in which you’ll create a simple contacts app that works with Handoff.
The tutorial does a nice job of explaining the handoff feature, the situations you’ll need to tackle for Handoff to work properly, performing a handoff, and in the second part Gabriel gets into continuation streams for communications with the originating app if you need to handle more data than the initial Handoff payload.
A nice in-depth guide on utilizing the new Handoff feature within an app.
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