gistfile1.swift

//
//  AddShowTransitionAnimator.swift
//  TVShowForecast
//
//  Created by Thomas Krajacic on 3.11.2014.
//  Copyright (c) 2014 Thomas Krajacic. All rights reserved.
//

import Cocoa

class FadeTransitionAnimator: NSObject, NSViewControllerPresentationAnimator {
    
    var hConstraints : [AnyObject]?
    var vConstraints : [AnyObject]?

    func animatePresentationOfViewController(viewController: NSViewController, fromViewController: NSViewController) {
        
        let bottomVC = fromViewController as NSViewController
        let topVC = viewController as NSViewController
        
        // make sure the view has a CA layer for smooth animation
        topVC.view.wantsLayer = true
        
        // set redraw policy
        topVC.view.layerContentsRedrawPolicy = .OnSetNeedsDisplay
        
        // switch to autolayout for resizing
        topVC.view.translatesAutoresizingMaskIntoConstraints = false
        
        // hide view initially
        topVC.view.alphaValue = 0.0
        
        // add view of presented viewcontroller
        bottomVC.view.addSubview(topVC.view)
        
        // add constraints
        self.hConstraints = NSLayoutConstraint.constraintsWithVisualFormat("H:|[top]|", options: nil, metrics: nil, views: ["top":topVC.view])
        self.vConstraints = NSLayoutConstraint.constraintsWithVisualFormat("V:|[top]|", options: nil, metrics: nil, views: ["top":topVC.view])
        
        bottomVC.view.addConstraints(self.hConstraints!)
        bottomVC.view.addConstraints(self.vConstraints!)
        
        // Do some CoreAnimation stuff to present view
        NSAnimationContext.runAnimationGroup({ (context) -> Void in
            
            context.allowsImplicitAnimation = true
            
            // fade duration
            context.duration = 1.3
            // move into place
            topVC.view.alphaValue = 1.0
            
            
            var transition:CATransition = CATransition()
            transition.type = kCATransitionMoveIn
            transition.subtype = kCATransitionFromRight
            transition.delegate = self

            topVC.transpose(transition)
            
            }, completionHandler: {
                
                
        })

    }
    
    func animateDismissalOfViewController(viewController: NSViewController, fromViewController: NSViewController) {

        let bottomVC = fromViewController as NSViewController
        let topVC = viewController as NSViewController
        
        // make sure the view has a CA layer for smooth animation
        topVC.view.wantsLayer = true
        
        // set redraw policy
        topVC.view.layerContentsRedrawPolicy = .OnSetNeedsDisplay
        
        // Do some CoreAnimation stuff to present view
        NSAnimationContext.runAnimationGroup({ (context) -> Void in
            
            context.allowsImplicitAnimation = true
            
            // fade duration
            context.duration = 1.3
            
            //move top view to the left
            topVC.view.alphaValue = 0.0
            
            }, completionHandler: {
        
                // remove view
                topVC.view.removeFromSuperview()
        })
        
        // The VC is deallocated
    }
    
}