 import UIKit
 
 extension ConstraidView {
+    @discardableResult
     open func center(verticallyWithinMarginsOf item: Any?,
         constant: CGFloat = 0.0,
         multiplier: CGFloat = 1.0,

        return collection
    }

    open func center(withinMarginsOf item: Any?,
        constant: CGFloat = 0.0,
        multiplier: CGFloat = 1.0,

        return collection
    }

    @discardableResult
    open func center(horizontallyWithinMarginsOf item: Any?,
        constant: CGFloat = 0.0,
        multiplier: CGFloat = 1.0,
