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# AVCaptureDevice.SystemPressureState

An object that provides information about OS and hardware status affecting capture system performance and availability.

```
class SystemPressureState
```

## Overview

The performance and availability of the camera capture system on an iOS device is subject to several external factors, such as power usage and device temperature. If during a capture session the total system pressure reaches excessive levels, the capture system automatically shuts down, causing a session interruption (see [`wasInterruptedNotification`](/documentation/AVFoundation/AVCaptureSession/wasInterruptedNotification)). Under less heavy pressure, the system may automatically reduce capture quality.

Key-value observe the capture device’s [`systemPressureState`](/documentation/AVFoundation/AVCaptureDevice/systemPressureState-swift.property) property to monitor its state, and take action to reduce the performance impact of your capture session when system pressure increases—for example, by reducing the capture frame rate.

## Topics

### Overall level

[`level`](/documentation/AVFoundation/AVCaptureDevice/SystemPressureState-swift.class/level-swift.property)

The overall level of performance constraints on the capture system.

[`AVCaptureDevice.SystemPressureState.Level`](/documentation/AVFoundation/AVCaptureDevice/SystemPressureState-swift.class/Level-swift.struct)

A structure that defines system pressure state levels.

### Contributing factors

[`factors`](/documentation/AVFoundation/AVCaptureDevice/SystemPressureState-swift.class/factors-swift.property)

The set of underlying causes for the system pressure level.

[`AVCaptureDevice.SystemPressureState.Factors`](/documentation/AVFoundation/AVCaptureDevice/SystemPressureState-swift.class/Factors-swift.struct)

A structure that defines the factors affecting capture system performance.


---

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