swift 내부에内容视图控制器를过渡효과를주어바꿀수있는根视图控制器

Posted 2021-05-19

//
//  RootViewController.swift
//  FiverPOS
//
//  Created by ljw on 2016. 10. 6..
//  Copyright © 2016년 Vovios Networks Inc. All rights reserved.
//

import UIKit

class RootViewControllerSegue: UIStoryboardSegue {
    
    override func perform() {
        guard let rootVC = source as? RootViewController else {
            fatalError("RootViewControllerSegue's source should be RootViewController")
        }
        rootVC.addRootContentViewController(destination, animated: false)
    }
}

/// 화면 전환을 담당하는 윈도우의 Root View Controller
class RootViewController: ViewController {
    
    var rootContainer: UIView = UIView(frame: UIScreen.main.bounds)
    var rootViewController: UIViewController? {
        return childViewControllers.last
    }
    
    override func loadView() {
        super.loadView()
        let container = rootContainer
        container.backgroundColor = .clear
        view.insertSubview(container, at: 0)
        container.translatesAutoresizingMaskIntoConstraints = false
        container.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        container.bottomAnchor.constraint(equalTo: bottomLayoutGuide.topAnchor).isActive = true
        container.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        container.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        layoutStatusBar()
    }

    
    init(rootViewController: UIViewController? = nil) {
        super.init(nibName: nil, bundle: nil)
        if let vc = rootViewController {
            addRootContentViewController(vc, animated: false)
        }
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        performSegue(withIdentifier: "root", sender: nil)
    }
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }
}

/// Transitioning Code
extension RootViewController {
    
    /// Transition animation duration
    static var transitionDuration: TimeInterval {
        return 0.5
    }
    
    /// child view controller 간에 전환을 시키는 메소드
    func transition(to viewController: UIViewController?, animated: Bool, completion: (() -> Void)? = nil) {
        let rootViewController = self.rootViewController
        switch (rootViewController, viewController) {
        case (nil, nil): return
        case (let previousRootViewController?, nil):
            removeRootContentViewController(previousRootViewController, animated: animated, completion: completion)
        case (nil, let newRootViewController?):
            addRootContentViewController(newRootViewController, animated: animated, completion: completion)
        case (let previous?, let new?):
            transitionRootContent(from: previous, to: new, animated: animated, completion: completion)
        }
    }
    
    /// 자식 뷰컨트롤러 간 전환
    func transitionRootContent(from fromViewController: UIViewController, to toViewController: UIViewController, animated: Bool, completion: (() -> Void)? = nil) {
        guard childViewControllers.contains(fromViewController) else {
            fatalError("fromViewController should belong to root view controller's childViewControllers")
        }
        
        // prepare view controller's containment hierarchy
        fromViewController.willMove(toParentViewController: nil)
        addChildViewController(toViewController)
        
        // prepare new view hierarchy layout
        toViewController.view.frame = rootContainer.bounds
        
        if animated {
            
            // prepare animation
            toViewController.view.alpha = 0
            
            // perform animation and apply new view hierarchy
            transition(from: fromViewController,
                       to: toViewController,
                       duration: RootViewController.transitionDuration,
                       options: [],
                       animations: {
                        
//                        UIView.setAnimationsEnabled(false)
//                        toViewController.view.transform = CGAffineTransform(scaleX: 0.01, y: 0.01)
//                        UIView.setAnimationsEnabled(true)
//                        
//                        toViewController.view.transform = CGAffineTransform.identity
                        toViewController.view.alpha = 1
                        
                        
            }) { (finished) in
                
                // complete view controller's containment hierarchy
                fromViewController.removeFromParentViewController()
                toViewController.didMove(toParentViewController: self)
                
                toViewController.view.clipsToBounds = true
                toViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
                toViewController.view.contentScaleFactor = UIScreen.main.scale
                
                completion?()
                
            }
        } else {
            
            // apply new view hierarchy
            fromViewController.view.superview?.insertSubview(toViewController.view, aboveSubview: fromViewController.view)
            fromViewController.view.removeFromSuperview()
         
            // complete view controller's containment hierarchy
            fromViewController.removeFromParentViewController()
            toViewController.didMove(toParentViewController: self)
            
            toViewController.view.clipsToBounds = true
            toViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
            toViewController.view.contentScaleFactor = UIScreen.main.scale
            
            completion?()
        }
    }
    
    
    /// 자식 뷰 컨트롤러 추가
    func addRootContentViewController(_ viewController: UIViewController, animated: Bool, completion: (() -> Void)? = nil) {
        // prepare view controller's containment hierarchy
        addChildViewController(viewController)
        
        // prepare new view hierarchy layout
        viewController.view.frame = rootContainer.bounds
        
        if animated {
            
            // prepare animation
            viewController.view.alpha = 0
            
            // apply new view hierarchy
            rootContainer.addSubview(viewController.view)
            
            // perform animation
            UIView.animate(withDuration: RootViewController.transitionDuration,
                           animations: {
                            
                            viewController.view.alpha = 1.0
                            
            }) { (finished) in
                
                // complete view controller's containment hierarchy
                viewController.didMove(toParentViewController: self)
                
                viewController.view.clipsToBounds = true
                viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
                viewController.view.contentScaleFactor = UIScreen.main.scale

                completion?()
                
            }
        } else {
            // apply new view hierarchy
            rootContainer.addSubview(viewController.view)
            
            // complete view controller's containment hierarchy
            viewController.didMove(toParentViewController: self)
            
            viewController.view.clipsToBounds = true
            viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
            viewController.view.contentScaleFactor = UIScreen.main.scale
            
            completion?()

        }
    }
    
    
    /// 자식 뷰컨트롤러 제거
    func removeRootContentViewController(_ viewController: UIViewController, animated: Bool, completion: (() -> Void)? = nil) {
        guard childViewControllers.contains(viewController) else {
            fatalError("viewController to remove should belong to root view controller's childViewControllers")
        }
        
        // prepare view controller's containment hierarchy
        viewController.willMove(toParentViewController: nil)
        
        if animated {
            // perform animation
            UIView.animate(withDuration: RootViewController.transitionDuration,
                           animations: {
                            
                            viewController.view.alpha = 0
                            
                },
                           completion: { (finished) in
                            
                            // apply new view hierarchy
                            viewController.view.removeFromSuperview()
                            viewController.view.alpha = 1
                            
                            // complete view controller's containment hierarchy
                            viewController.removeFromParentViewController()
                            
                            completion?()
            })
            
        } else {
            // apply new view hierarchy
            viewController.view.removeFromSuperview()
            
            // complete view controller's containment hierarchy
            viewController.removeFromParentViewController()
            
            completion?()
            
        }
    }
    
}

extension RootViewController {
    private struct AssociatedKey {
        static var statusBarHidden = "RootViewController.statusBarHidden"
        static var statusBarLayer = "RootViewController.statusBarLayer"
    }
    
    fileprivate var statusBarLayer: CALayer {
        var layer = objc_getAssociatedObject(self, &AssociatedKey.statusBarLayer) as? CALayer
        if layer == nil {
            layer = CALayer()
            layer?.zPosition = 3000
            layer?.backgroundColor = UIColor(white: 0.0, alpha: 0.12).cgColor
            objc_setAssociatedObject(self, &AssociatedKey.statusBarLayer, layer, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
        return layer!
    }
    
    @IBInspectable var statusBarHidden: Bool {
        get {
            if let hidden = objc_getAssociatedObject(self, &AssociatedKey.statusBarHidden) as? Bool {
                return hidden
            } else {
                return true
            }
        }
        set {
            objc_setAssociatedObject(self, &AssociatedKey.statusBarHidden, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
    
    fileprivate func layoutStatusBar() {
        let layer = statusBarLayer
        if statusBarHidden == false {
            let statusBarFrame = view.convert(UIApplication.shared.statusBarFrame, from: UIApplication.shared.keyWindow)
            layer.frame = statusBarFrame
            if layer.superlayer == nil {
                view.layer.addSublayer(layer)
            }
        } else {
            if layer.superlayer != nil {
                layer.removeFromSuperlayer()
            }
        }
    }
    
}