// UIImagePickerControllerCameraDeviceRear 后置摄像头
// UIImagePickerControllerCameraDeviceFront 前置摄像头
BOOL isRearCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
BOOL isFrontCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];
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