device.focusPointOfInterest = focusPoint
device.focusMode = AVCaptureFocusMode.AutoFocus
device.exposurePointOfInterest = focusPoint
device.exposureMode = AVCaptureExposureMode.ContinuousAutoExposure
我不知道为什么这样做，但确实如此。
iOS点按即可聚焦
iOS点按即可聚焦
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