objective c - AVFoundation set white balance values back to auto -

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i'm building app want change white balance using avcapturewhitebalancetemperatureandtintvalues, after while want change white balance automatic. there variable in avfoundation allows reset temperature , tint values auto?

figured out. in same boat, line of code added: 

[_videodevice setwhitebalancemode:avcapturewhitebalancemodecontinuousautowhitebalance];

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