focusPointOfInterest
The point of interest for focusing.
Declaration
var focusPointOfInterest: CGPoint { get set }Discussion
Setting a value for this property doesn’t initiate a focusing operation. To focus the camera on a point of interest, first set this property’s value, then set the focusMode property to AVCaptureDevice.FocusMode.autoFocus or AVCaptureDevice.FocusMode.continuousAutoFocus.
This property’s CGPoint value uses a coordinate system where {0,0} is the top-left of the picture area and {1,1} is the bottom-right. This coordinate system is always relative to a landscape device orientation with the home button on the right, regardless of the actual device orientation. You can convert between this coordinate system and view coordinates using AVCaptureVideoPreviewLayer methods.
Before changing the value of this property, you must call lockForConfiguration() to acquire exclusive access to the device’s configuration properties. Otherwise, setting the value of this property raises an exception. When you finish configuring the device, call unlockForConfiguration() to release the lock and allow other devices to configure the settings.
This property is key-value observable.