A PureLayout Demo in Swift please use cocoapods to install the pods pod install problems below: the cell display abnormally,but when I scroll the table view the cell become correctly if I put HelpHistoryCell -> updateConstraints content into init method the cell is also display correctly if I put the updateConstraints content into layoutSubviews, it also display correctly I think the two solution above is not elegant I think the problem maybe in lazy keywords or the sequence of layoutSubview and updateConstraints, but I don't know the exact reason