CGFloat
ConstraintInsetTarget
遵循协议
CGSize
ConstraintOffsetTarget
父类
UInt
1.CGPointC2.GSize3.ConstraintInsets4.extionsion扩展方法：返回CGFloat
Double
CGPoint
下边这几个都遵循这个空协议
1.Int2.Unint3.Float4.Double5.CGFloat6.UILayoutPrity7.extionsion扩展方法：返回Float
ConstraintItem
ConstraintDirectionalInsetTarget
layoutGilde
ConstraintInset
协议
ConstraintConstantTarget
ConstraintPriorityTarget
Float
UIView
1.Int2.Unint3.Float4.Double5.CGFloat6.遵循协议返回CGFloat
Int
ConstraintMultiplierTarget
ConstraintRelatableTarget
