Set all provided error labels as hidden - new property

[sashberd]

Hi
In many cases all validation error labels are hidden by default while VC is loading
How about to add some flag to validation init for hidden all labels that was/will passed as error labels.
Or on registerField provide another property to pass: isLabelHidden.
This will reduce from lib user mistakes to hide/show labels

Moreover, may be on validate function call you can hide all errors if above flag is turned on

Thanks