切换界面时自定义过度动画

SwiftScreenMotionTips.swift

//
//  TransitionManager.swift
//  SwiftScreenMotionTips
//
//@see http://mathewsanders.com/animated-transitions-in-swift/

import UIKit
import Darwin  //contain pi's constant

class TransitionManager: NSObject,  UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate {
    
    private var isReverse = false
    private var pi = M_PI //import pi, alt + p create pi's character
    
    /*  from left to right and from right to left
    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
        let container = transitionContext.containerView()
        let fromView = transitionContext.viewForKey(UITransitionContextFromViewKey)!
        let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!
        
        let offScreenRight = CGAffineTransformMakeTranslation(container.frame.width, 0)
        let offScreenLeft = CGAffineTransformMakeTranslation(-container.frame.width, 0)
        
        if isReverse {
            toView.transform = offScreenLeft
        }
        else {
            toView.transform = offScreenRight
        }
        
        container.addSubview(toView)
        container.addSubview(fromView)
        
        let duration = self.transitionDuration(transitionContext)
        
        UIView.animateWithDuration(duration, delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.8, options: nil, animations: {
            //[unowned self] in 由于isReverse为值复制类型，不需要进行内存管理
            if self.isReverse {
                fromView.transform = offScreenRight
            }
            else {
                fromView.transform = offScreenLeft
            }
            toView.transform = CGAffineTransformIdentity
            }, completion: { finished in
                transitionContext.completeTransition(true)
        })
    }
    */
    
    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
        let container = transitionContext.containerView()
        let fromView = transitionContext.viewForKey(UITransitionContextFromViewKey)!
        let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!

        let offScreenRotateIn = CGAffineTransformMakeRotation(CGFloat(-pi * 0.5))
        let offScreenRotateOut = CGAffineTransformMakeRotation(CGFloat(pi * 0.5))
        
        if isReverse {
            toView.transform = offScreenRotateOut
        }
        else {
            toView.transform = offScreenRotateIn
        }
        
        toView.layer.anchorPoint = CGPoint(x: 0, y: 0)
        fromView.layer.anchorPoint = CGPoint(x: 0, y: 0)
        
        toView.layer.position = CGPoint(x: 0, y: 0)
        fromView.layer.position = CGPoint(x: 0, y: 0)
        
        container.addSubview(toView)
        container.addSubview(fromView)

        let duration = self.transitionDuration(transitionContext)
        
        UIView.animateWithDuration(duration, delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.8, options: nil, animations: {
            if self.isReverse {
                fromView.transform = offScreenRotateIn
            }
            else {
                fromView.transform = offScreenRotateOut
            }
            toView.transform = CGAffineTransformIdentity
            }, completion: { finished in
                transitionContext.completeTransition(true)
        })
    }
    
    func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {
        return 0.5
    }
    
    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        isReverse = false
        return self
    }
    
    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        isReverse = true
        return self
    }
}



//
//  ViewController.swift
//  SwiftScreenMotionTips
//
import UIKit

class ViewController: UIViewController {

    let transitionManager = TransitionManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let toViewController = segue.destinationViewController as UIViewController
        toViewController.transitioningDelegate = self.transitionManager
    }

    @IBAction func unwindToViewController(send: UIStoryboardSegue) {
        
        
    }
    
    override func preferredStatusBarStyle() -> UIStatusBarStyle {
        return self.presentingViewController == nil ? UIStatusBarStyle.Default : UIStatusBarStyle.LightContent
    }
}

1.在使用Closures时，需要注意是否会有内存回收问题。
在苹果swift文档的Automatic Reference Counting中
关于Defining a Capture的介绍Listhttps://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AutomaticReferenceCounting.html#//apple_ref/doc/uid/TP40014097-CH20-ID48