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How can I customize the UI?

You have different methods to customize the GUI:

[self.scanditSDKBarcodePicker.overlayController setViewfinderColor:0 green:0.4 blue:0.8];

       and  the color of the viewfinder once the bar code has been recognized: setViewfinderDecodedColor

[self.scanditSDKBarcodePicker.overlayController setViewfinderDecodedColor:0 green:0.4 blue:0.8];

[picker.overlayController setViewfinderHeight:0.7 width:0.3 landscapeHeight:0.4 landscapeWidth:0.3]; 

[self.scanditSDKBarcodePicker.overlayController drawViewfinder:NO];
[self.scanditSDKBarcodePicker.overlayController.view  addSubview:self.newViewFinder];

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