[SWIFT]특정 방향의 constraints 비활성화 후 강제로 Equal Multiplier 강제 적용

import UIKit

extension NSLayoutConstraint {
    func constraintWithMultiplier(_ multiplier: CGFloat) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: self.firstItem!, attribute: self.firstAttribute, relatedBy: self.relation, toItem: self.secondItem, attribute: self.secondAttribute, multiplier: multiplier, constant: self.constant)
    }
}

// 특정 방향의 constraints 비활성화 후 강제로 Equal Multiplier 강제 적용
itemStackViewEqualWidthConstraints = itemStackViewEqualWidthConstraints.constraintWithMultiplier(0.5)
itemStackViewEqualWidthConstraints.isActive = true
itemStackView.layoutIfNeeded()