Can not get MTBTorchModeAuto to work in B4i about mtbbarcodescanner

[mikebuss]

Hey @JackKirk - awesome library! I'm going to bookmark this if I ever work on Android development.

To answer your question: the torch functionality in MTBBarcodeScanner is a little limited. The scanner object gives you the ability to turn the torch on or off, but doesn't allow you to automatically turn the torch on based on lighting conditions. The reason there's a MTBTorchModeAuto option is because this is a wrapper over AVCaptureTorchMode, which has the following options:

/*!
 @enum AVCaptureTorchMode
 @abstract
    Constants indicating the mode of the torch on the receiver's device, if it has one.

 @constant AVCaptureTorchModeOff
    Indicates that the torch should always be off.
 @constant AVCaptureTorchModeOn
    Indicates that the torch should always be on.
 @constant AVCaptureTorchModeAuto
    Indicates that the torch should be used automatically depending on ambient light conditions.
*/
typedef NS_ENUM(NSInteger, AVCaptureTorchMode) {
    AVCaptureTorchModeOff  = 0,
    AVCaptureTorchModeOn   = 1,
    AVCaptureTorchModeAuto = 2,
} NS_AVAILABLE(10_7, 4_0) __TVOS_PROHIBITED;

If you'd like to accomplish turning the torch on/off depending on lighting conditions, I would suggest taking a look at this post, which talks about continuously sampling the brightness level.

I'm going to close this for now, as it's more of a feature request than a bug, but if you'd like to discuss this further please feel free to email me.