ilandbt

class MainNavigationController: UINavigationController {
  
    // autorotate by top viewController 
    override var shouldAutorotate: Bool {
        if !viewControllers.isEmpty {
            return self.topViewController!.shouldAutorotate
        } else {
            return true
        }

ilandbt

extension UIView {

 var heightWithConstraint: CGFloat {
        get {
            for constraint in constraints where constraint.firstAttribute == .height {
                return constraint.constant
            }
            return 0
        }
        set (newHeight){

ilandbt

import UIKit

class Pet {
    
}

class Cat: Pet {
    
}

ilandbt

extension A {
	private foo() {
   
 }
}