         return collection
     }
 
+    @discardableResult
     open func center(horizontallyWithinMarginsOf 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,

import UIKit

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