Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Deploy components of an application into a separate process or container to provide isolation and encapsulation. This pattern can also enable applications to be composed of heterogeneous components and technologies. This pattern is named Sidecar because it resembles a sidecar attached to a motorcycle.
In the pattern, the sidecar is attached to a parent application and provides supporting features for the application. The sidecar also shares the same lifecycle as the parent application, being created and retired alongside the parent.
The sidecar pattern is sometimes referred to as the sidekick pattern and is a decomposition pattern. Applications and services often require related functionality, such as monitoring, logging, configuration, and networking services.
These peripheral tasks can be implemented as separate components or services. If they are tightly integrated into the application, they can run in the same process as the application, making efficient use of shared resources. As you can with other secondary displays, you can choose to use your iPad to expand or mirror your Mac's desktop, as we briefly mentioned above. Using the iPad as a secondary display works in the same way you would use any other second display.
You can move your mouse cursor from one screen to another when they are side-by-side and you can choose to position the Dock and menu bar on either screen, as well as drag apps back and forth. When used as an extended desktop, users can spread their workspace across the iPad and their Mac, such as work on a document on the iPad and reference a webpage on their Mac, or place a Photoshop canvas on one display and the tools and palettes on another.
When mirroring your Mac desktop on your iPad, you can showcase features without everyone huddled around your computer screen, for example. In addition to expanding your desktop real-estate, Sidecar adds extra functionality through a feature called Sidebar. The Sidebar feature is designed to help you create with Apple Pencil, without moving your hands from the iPad. The Sidebar feature gives you access to your most commonly used controls, which include modifier keys like Command, Option, Control and Shift to enable shortcuts in supported apps.
If you double tap a modifier key in the Sidebar, it will keep that key active, allowing you to work without having to hold it down, while an additional tap will deactivate the key. There are also controls like undo on the Sidebar and you can also display or hide the Dock, menu bar or keyboard with simple taps. The Touch Bar feature will place app functions close at hand on the iPad's display so you don't have to reach for the keyboard or switch displays.
The Touch Bar will appear at the top or bottom of your iPad, or you can choose to hide it. You can swipe, scroll and pinch to zoom, as you can on the Mac trackpad. For example, you could enlarge your artwork by pinching out to zoom in on a detail on your iPad, or use the iPadOS text editing features to copy, paste and undo without moving your hands from the iPad's onscreen keyboard. One of other the key Sidecar features is Apple Pencil for tablet input, allowing you to use your iPad as a digital notepad, marking up images or drawing using supported apps.
Take advantage of sidebar shortcuts. Use the sidebar on your iPad to quickly reach commonly used buttons and controls. Tap the buttons to undo actions, use keyboard shortcuts, and display or hide the menu bar, Dock, and keyboard. Use Touch Bar controls—with or without a Touch Bar.
For apps that have Touch Bar support, the controls appear at the bottom of the iPad display, whether or not your Mac has a Touch Bar. Learn more. This is why you should download Bartender. Bartender provides a quick and simple way to customize your Mac menu bar, hiding all the disparate icons behind a single, familiar three-dot menu.
Clicking the menu will surface all of your menu bar icons, which can be easily reordered with Bartender, too. Using your Apple Pencil with Sidebar is just as seamless and simple as it is with your iPad. Apple Pencil in Sidecar is essentially like a mouse pointer; you can do things like edit images or markup documents. Apps like Pixelmator and Notes also allow for sketching with Apple Pencil.
If you use double-tap on your Apple Pencil for iPad, Sidecar can support that as well. Sidecar mirrors your mac display. That means any Mac app will work with Sidecar. Some have unique capabilities; photo editing apps, for instance, would benefit greatly from Sidecar when used on an iPad with Apple Pencil.
By default, any Mac app can be moved to your iPad screen, and interacting with it there — either with Apple Pencil or by touch — will be just like interacting with it using a mouse or trackpad. Simply swipe up from the bottom of your iPad display to bring up the dock or navigate to the home screen. You can also use iPad apps floating over your screen, just as you can when using iPad apps natively.
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