Your iPhone now contains a “Measure” app that acts as a high-tech tape measure. Just launch the app, point your camera at something, and it will measure dimensions of objects in the real world.
您的iPhone现在包含一个“ Measure”应用程序，可充当高科技卷尺。 只需启动该应用程序，将相机对准某个物体，它将可以测量现实世界中物体的尺寸。
This is one of the many new features in the iOS 12 update. It uses augmented reality—specifically, Apple’s ARKit technology. Apps like this already existed in the App Store, but now one comes with the iPhone.
这是iOS 12更新中的许多新功能之一。 它使用增强现实技术，特别是苹果公司的ARKit技术。 这样的应用程序已经在App Store中存在，但是现在iPhone附带了一个。
Launch the “Measure” app to get started. You’ll see it somewhere on your home screen, and you can always swipe down on the home screen and search for “Measure” to find it.
启动“测量”应用程序以开始使用。 您会在主屏幕上的某处看到它，并且始终可以在主屏幕上向下滑动并搜索“测量”以找到它。
You’ll be prompted to move your iPhone around to calibrate the Measure app. You don’t need to do anything fancy—just move the iPhone around until it says you’re ready to begin.
系统将提示您移动iPhone来校准Measure应用。 您不需要做任何花哨的事情-只需移动iPhone，直到它说您准备好开始为止。
When the app is ready, point your iPhone at the thing you want to measure, and you’ll see a dot in a circle. Tap the plus sign button to add the starting point for measuring. That point will remain anchored to the object in the real world, even as you move your phone around.
应用就绪后，将iPhone对准要测量的物体，您会看到一个圆圈。 点击加号按钮以添加测量起点。 即使您移动手机，该点仍将固定在现实世界中的对象上。
Now, just move your phone. It will measure the distance between the point you placed and whatever is under the dot at the center of your screen.
现在，只需移动手机即可。 它将测量您放置的点与屏幕中心点下方的所有点之间的距离。
If the point you want to measure is too far away, you’ll be prompted to choose a closer object. Move closer to the object you want to measure, if possible. You won’t be able to measure properly if you’re too close, either.
如果要测量的点太远，则会提示您选择一个更近的对象。 如果可能，请移近要测量的对象。 如果距离太近，也将无法正确测量。
Tap the “+” button again to place the second point and anchor it on the screen. The Measure app will draw a line between the two points.
再次点击“ +”按钮放置第二个点并将其锚定在屏幕上。 Measure应用程序将在两点之间绘制一条线。
You can continue this process to measure multiple distances and have them on screen all at once.
您可以继续此过程以测量多个距离，并将它们一次显示在屏幕上。
Tap the back arrow button at the top of the screen to undo your last action, or tap “Clear” to remove every point you’ve placed on the screen.
点按屏幕顶部的后退箭头按钮以撤消上一次操作，或点按“清除”以删除您在屏幕上放置的每个点。
Your iPhone will automatically prompt you to measure some objects, too. Just move your phone so the object is positioned under the dot at the center of your screen, and you may see a prompt to add a shape around the object.
您的iPhone也会自动提示您测量一些物体。 只需移动手机，以使对象位于屏幕中心的点下，您可能会看到提示在对象周围添加形状。
Tap the “+” button to draw lines around the object and measure its dimensions automatically.
点击“ +”按钮在对象周围绘制线条并自动测量其尺寸。
This app also contains a “Level” feature. Just tap the “Level” button on the toolbar at the bottom, and the phone will measure the angle at which it’s oriented. Place your iPhone on a surface to see whether it’s flat—or exactly how many degrees it’s off by if it isn’t.
该应用程序还包含“级别”功能。 只需点击底部工具栏上的“水平”按钮，手机就会测量其定向角度。 将您的iPhone放在表面上，看它是否平坦-或者如果不是，则精确地偏离多少度。
When the phone is placed on a level surface, the screen will say 0 degrees and will turn green.
将手机放在水平面上时，屏幕将显示0度并变为绿色。
We found the Measure app pretty accurate. However, we encourage you to double-check with a physical tape measure or ruler if you need precise measurements. The app won’t always get a perfect measurement in every scenario. We wouldn’t rely on Measure as the final word in a carpentry project any time soon.
我们发现Measure应用非常准确。 但是，如果需要精确的测量，我们建议您使用物理卷尺或尺子仔细检查。 该应用程序在每种情况下都无法始终获得完美的评估。 我们不会很快将Measure作为木工项目中的最后一句话。
翻译自: https://www.howtogeek.com/366577/how-to-measure-distances-with-your-iphone/