3D Touch adds an additional dimension to touch-based interaction. On supported devices, people can access additional functionality by applying varying levels of pressure to the touchscreen. Apps can respond by displaying a menu, showing additional content, or playing an animation. People don’t need to learn new gestures to interact with 3D Touch. They quickly discover the additional interactive dimension when they press lightly on the screen and get a response.
Home Screen Interaction
On the Home screen, pressing the icon of an app that supports 3D Touch displays an action view. This view lets you quickly perform common app-specific tasks and see interesting information. Calendar, for example, provides a shortcut for creating an event. It also shows the next event on your schedule. For design guidance, see Home Screen Actions and Widgets.
Peek and Pop
A peek lets people use 3D Touch to preview an item, such as a page, link, or file, in a view that appears temporarily above the current context. To peek at an item that supports this functionality, apply a little pressure to the item with your finger. Simply lift your finger to exit the peek. To open the item and see more detail, press a little harder until the item pops and fills the screen. In some peek views, you can swipe up to reveal related action buttons. For example, while peeking at a link in Safari, you can swipe up to reveal buttons for opening the link in the background, adding the link to your reading list, and copying the link.
Use peeking to provide live, content-rich previews. Ideally, peeking gives enough information about an item to augment the current task, or helps you decide whether to fully engage the item. For example, preview a link in a Mail message before deciding to open it in Safari or share it with friends. Peeking is often used in tables to view detailed row information before the row is selected.
Design big-enough peek views. Design a peek view that's large enough so that fingers don’t obscure its content. Make the peek detailed enough for people to decide whether to press a little deeper to fully open (pop) the item.
Adopt Peek and Pop consistently. If you support Peek and Pop in some places but not others, people won’t know where they can use the feature and may think there’s a problem with your app or their device.
Allow every peek to be popped. Even though peeking should give people most of the information they need, always let them transition to the pop if they decide to switch away from the current task and focus on the item. Popping should show the same thing as tapping the item.
Avoid displaying button-like elements in a peek view. If a user lifts a finger to tap an element that looks like a button, the peek disappears.
Apps can incorporate pressure into the photo viewing experience by supporting Live Photos. Live Photos come to life when you press them, using movement and sound to show the moments just before and after the photo was taken. For design guidance, see Live Photos.