ios - UIView in NSLayoutContraint does not conform to AnyObject in swift -

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i have found question , answer here error

type 'uiview!' not conform protocol 'anyobject'

for 

... @iboutlet var mainview: uiview! @iboutlet weak var contentview: uiview! ... nslayoutconstraint(item: self.contentview, ...`

is there somthing happening dereferencing view object?

i getting same error after copy-pasting , trying modify objective-c code swift project. realized had left relatedby 0 instead of nslayoutrelation.equal. after fixing error went away. weird compiler show error on first parameter when issue relatedby. hope helps.


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