Add note about isActive
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@ -98,3 +98,29 @@ function App() {
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}
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### The `isActive` prop
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The Camera's `isActive` property can be used to _pause_ the session (`isActive={false}`) while still keeping the session "warm". This is more desirable than completely unmounting the camera, since _resuming_ the session (`isActive={true}`) will be **much faster** than re-mounting the camera view.
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For example, you want to **pause the camera** when the user **navigates to another page** or **minimizes the app** since otherwise the camera continues to run in the background without the user seeing it, causing **siginificant battery drain**. Also, on iOS a green dot indicates the user that the camera is still active, possibly causing the user to raise privacy concerns. (🔗 See ["About the orange and green indicators in your iPhone status bar"](https://support.apple.com/en-us/HT211876))
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This example demonstrates how you could pause the camera stream once the app goes into background using a custom `useIsAppForeground` hook:
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```tsx
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function App() {
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const devices = useCameraDevices()
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const device = devices.back
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const isAppForeground = useIsAppForeground()
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return (
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<Camera
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style={StyleSheet.absoluteFill}
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device={device}
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isActive={isAppForeground}
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/>
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)
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}
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```
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> Note: If you don't care about fast resume times you can also fully unmount the `<Camera>` view instead, which will use a lot less memory (RAM).
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