如果您的显示器空间不足，可能是时候考虑使用第二台显示器了。这将提高您的工作效率，但它不是一个特别便携的选项。对于端口有限的Mac用户，如果不将昂贵的适配器也添加到成本清单中，使用第二台显示器是相当困难的。
然而，苹果(Apple)领先一步。如果您是拥有Mac和备用 iPad 的用户，则可以使用Apple Sidecar将 iPad 作为第二个屏幕。此功能是内置的，可供运行 macOS 10.15 Catalina的 macOS 用户和运行 iPadOS 13 的 iPad 用户使用。
Apple Sidecar 的最低系统要求(Minimum System Requirements For Apple Sidecar)
要在 macOS 设备上使用Apple Sidecar，您需要两件东西——Mac和 iPad。但是，Sidecar仅在更新的Mac和 iPad 设备上可用。
您需要一台运行 macOS 10.15 Catalina的 macOS 设备。对于MacBook和MacBook Pro用户，您的设备需要是 2016 年或更新机型。MacBook Air用户需要 2018 年或更新机型才能获得Sidecar支持。
iMac（2017 及更新机型）、i Mac Pro(Mac Pro)（所有机型）、Mac mini（2018 及更新机型）和Mac Pro（2019 及更新机型）也支持 Sidecar 。
也不是每个 iPad 都支持Sidecar。iPad Pro(Pro)的所有型号都支持Apple Sidecar，但只有第 6 代 iPad 及更高版本支持它。iPad Mini用户需要第 5 代或更新机型，而 iPad Air用户需要第 3 代机型。
要使用Sidecar，您的 iPad 和Mac都需要使用同一个Apple帐户和启用了双重身份验证(two-factor authentication enabled)的帐户登录。如果不是，Sidecar 将无法工作。
使用 Apple Sidecar 连接到 iPad(Connecting To An iPad Using Apple Sidecar)
如果您的Mac和 iPad 都能够支持Apple Sidecar并且都是最新的，您几乎可以立即开始使用Sidecar，但您需要先连接到 iPad。
有两种方法可以将 iPad 连接到Mac。您可以使用蓝牙(Bluetooth)进行无线连接，确保两台设备都启用了蓝牙(Bluetooth)，或者您可以使用支持的充电线将 iPad 直接连接到Mac 。
- 要连接到 iPad，请按 Mac 菜单栏中的AirPlay图标。如果 iPad 在范围内（几米内），您的 iPad 将出现在下拉列表中。按下 iPad 连接选项。
- 如果连接成功，您的 iPad 屏幕将变为显示您的桌面背景。您可以使用触控板或鼠标将打开的窗口手动拖动到屏幕上，或者将鼠标悬停在打开的窗口中的绿色图标上并按下“(green icon)移至 iPad(Move to iPad ) ”选项，从而将打开的窗口移动到其中。
- 您还可以选择镜像您的Mac显示器，而不是扩展它，以便您的 iPad 显示与您的Mac相同的内容。
按菜单栏中的屏幕图标( screen icon)（这将取代AirPlay 图标(AirPlay icon)）。在AirPlay: Sidecar Display的列表下，按Mirror Built-in Retina Display选项。这将开始在您的 iPad 上镜像您的显示。
- 要断开Apple Sidecar显示器并让 iPad 恢复正常使用，请按镜像栏中的屏幕图标(screen icon)（替换AirPlay 图标(AirPlay icon)），然后按断开连接(Disconnect )选项。Sidecar将断开连接，您的 iPad 屏幕应恢复正常。
在 iPad 上使用 Sidebar、Touch Bar 和 Apple Pencil 和 Sidecar(Using The Sidebar, Touch Bar & Apple Pencil With Sidecar On iPad)
使用Apple Sidecar(Apple Sidecar)连接到 iPad时，您的第二台显示器将显示两个额外的菜单（取决于您拥有的设备类型）。这些是Sidebar和Touch Bar。
边栏(Sidebar)是 iPad 侧面的菜单，当它用作边车(Sidecar)显示器时会出现。这使您可以快速使用常用的Mac键（如Command和Option键）、撤消某些操作，以及快速隐藏或显示Mac Dock或菜单栏。
- 您可以在Sidecar设置菜单中启用此功能，方法是按Apple icon menu > System Preferences > Sidecar并启用Show Sidebar复选框。您可以在下拉菜单中选择放置Sidecar的位置。(Sidecar)
如果您有新型号的MacBook或MacBook Pro，您的键盘顶部可能会有一个触控板，称为触控栏(Touch Bar)。您可以在 iPad 上的Apple Sidecar(Apple Sidecar)模式下获得此功能，当您在Mac上使用不同的应用程序时显示各种选项和操作。
- 要启用Sidecar Touch Bar，请按Apple icon menu > System Preferences > Sidecar并启用Show Touch Bar复选框，在旁边的下拉菜单中选择位置。
Apple Pencil还可以用作 iPad 的附加控制设备，允许您在某些应用程序上绘图或控制。它还支持Apple Pencil双击以在某些应用程序中的工具之间快速切换，但您需要先在 Sidecar 偏好设置中启用此功能。
- 为此，请按Apple menu icon > System Preferences > Sidecar ，然后在 Apple Pencil复选框上按启用双击。(Enable double tap on Apple Pencil)
在 Apple Sidecar 中使用 Multi-Touch iPad 手势(Using Multi-Touch iPad Gestures With Apple Sidecar)
如果您想充分利用 iPad 的触控功能，您可以在Sidecar模式下使用 iPad 支持的各种多点触控手势来操作您的Mac应用程序。(Mac)
这些将要求您首先在 iPad 上启用手势。您可以在 iPad 设置中检查这一点，方法是点击Settings > Home Screen & Dock > Multitasking，并确保手势(Gestures)切换设置为开(On)。
以下是一些常见的手势，您可以在 iPad 的Sidecar模式下使用它们。
- 要使用 iPad 屏幕滚动，请用两根手指向下按并向上或向下滑动。
- 要撤消操作，请向左滑动或用三个手指双击 iPad 屏幕。要重做操作，请改为向右滑动。
- 您可以使用三指向内捏合的手势复制或剪切文本或图像。执行两次以剪切文本。
- 要粘贴，请改为使用三个手指在 iPad 屏幕上张开。
使用多个显示器和监视器(Using Multiple Displays & Monitors)
使用Apple Sidecar，您不需要昂贵的第二台显示器来镜像或扩展您的 macOS 显示器。借助 Sidecar(Sidecar)，您可以免费将 iPad 用作第二台显示器，为您提供快速便携的显示器供您在家中或旅途中使用。
遗憾的是，Windows 用户没有开箱即用的类似功能。Windows PC(Windows PCs)的最佳选择仍然是考虑使用第二台显示器——幸运的是，在 Windows 上设置双显示器(setting up dual monitors on Windows)很容易。
How To Use Apple Sidecar
If you’re running out of displаy real estate, it mіght be time to consider a seсond mоnitor. This’ll improve yoυr productivity, but it’s not a particularly portable option. For Mac users with limited ports, using a second mоnitor is prеtty difficult without adding an еxpensive adapter to the cost list, too.
Apple is one step ahead, however. If you’re a user with a Mac and a spare iPad, you can use your iPad as a second screen using Apple Sidecar. This feature is built-in and available to macOS users running macOS 10.15 Catalina and iPad users with iPadOS 13.
Minimum System Requirements For Apple Sidecar
To use Apple Sidecar with your macOS device, you’ll need two things—a Mac and an iPad. However, Sidecar is only available on more recent Mac and iPad devices.
You’ll need a macOS device running macOS 10.15 Catalina. For MacBook and MacBook Pro owners, your device needs to be a 2016 model or later. MacBook Air owners will need a 2018 or later model for Sidecar support to be available.
Sidecar is also supported on the iMac (2017 and later models), iMac Pro (all models), Mac mini (2018 and later models), and Mac Pro (2019 and later models).
Not every iPad supports Sidecar, either. All models of the iPad Pro support Apple Sidecar, but only the 6th generation iPad and later support it. iPad Mini owners need a 5th generation model or later, while iPad Air owners need a 3rd generation model.
To use Sidecar, your iPad and Mac will both need to be signed in using the same Apple account and with an account that has two-factor authentication enabled. If it isn’t, Sidecar won’t work.
Connecting To An iPad Using Apple Sidecar
If your Mac and iPad are both capable of supporting Apple Sidecar and are both up-to-date, you can begin using Sidecar almost immediately, but you’ll need to connect to your iPad first.
There are two ways to connect your iPad to your Mac. You can connect wirelessly using Bluetooth, making sure both devices have Bluetooth enabled, or you can connect your iPad to your Mac directly using a supported charging cable.
- To connect to your iPad, press the AirPlay icon in your Mac’s menu bar. Your iPad, if it’s in range (within a couple of meters), will appear in the drop-down list. Press the option for your iPad to connect.
- If the connection is successful, your iPad screen will change to show your desktop background. You can move open windows to it by dragging them manually using your trackpad or mouse towards the screen or by hovering over the green icon in an open window and pressing the Move to iPad option.
- You can also choose to mirror your Mac display, rather than extending it, so that your iPad shows the same content as your Mac.
Press the screen icon in your menu bar (this will have replaced the AirPlay icon). Under the listing for AirPlay: Sidecar Display, press the Mirror Built-in Retina Display option. This will begin mirroring your display on your iPad instead.
- To disconnect your Apple Sidecar display and return your iPad to general use, press the screen icon in the mirror bar (replacing the AirPlay icon) and press the Disconnect option. Sidecar will be disconnected, and your iPad screen should return to normal.
Using The Sidebar, Touch Bar & Apple Pencil With Sidecar On iPad
While connected to your iPad using Apple Sidecar, your second display will show two additional menus (depending on the type of device you have). These are the Sidebar and Touch Bar.
The Sidebar is a menu on the side of your iPad that appears while it’s being used as a Sidecar display. This allows you to quickly use common Mac keys like the Command and Option keys, undo certain actions, as well as to hide or show the Mac Dock or menu bar quickly.
- You can enable this in your Sidecar settings menu by pressing the Apple icon menu > System Preferences > Sidecar and enabling the Show Sidebar checkbox. You can select where to position the Sidecar in the drop-down menu.
If you have a new model MacBook or MacBook Pro, you’ll likely have a touchpad at the top of your keyboard called the Touch Bar. You can obtain this functionality in Apple Sidecar mode on your iPad, displaying various options and actions while you’re using different apps on your Mac.
- To enable the Sidecar Touch Bar, press the Apple icon menu > System Preferences > Sidecar and enable the Show Touch Bar checkbox, selecting the position in the drop-down menu beside it.
The Apple Pencil can also be used as an additional control device for your iPad, allowing you to draw on or control certain apps. It also supports Apple Pencil double-tapping to quickly switch between tools in certain apps, but you’ll need to enable this in your Sidecar preferences first.
- To do this, press the Apple menu icon > System Preferences > Sidecar and press Enable double tap on Apple Pencil checkbox.
Using Multi-Touch iPad Gestures With Apple Sidecar
If you want to make full use of your iPad’s touch capabilities, you can use various multi-touch gestures that the iPad supports to manipulate your Mac apps while in Sidecar mode.
These will require you to have gestures enabled on your iPad first. You can check this in your iPad settings by tapping Settings > Home Screen & Dock > Multitasking and making sure that the Gestures toggle is set to On.
Here are some common gestures that you can use with your iPad in Sidecar mode.
- To scroll using your iPad screen, press down with two fingers and swipe upwards or downwards.
- To undo an action, swipe left or double-tap the iPad screen using three fingers. To redo an action, swipe right instead.
- You can copy or cut text or images using gestures by pinching inwards using three fingers. Perform this twice to cut the text instead.
- To paste, pinch out on the iPad screen using three fingers instead.
Using Multiple Displays & Monitors
Using Apple Sidecar, you don’t need an expensive second monitor to mirror or extend your macOS display. Thanks to Sidecar, you can use your iPad as a second monitor for free, giving you a quick and portable display for you to use, either at home or on the go.
Sadly, Windows users don’t have a similar feature available to you out-of-the-box. The best option for Windows PCs is still to consider using a second monitor—thankfully, setting up dual monitors on Windows is easy.
