ShotsApp-Gestures study note

Home.swift

//
//  Home.swift
//  ShotsApp
//
//  Created by Meng To on 2014-07-29.
//  Copyright (c) 2014 Meng To. All rights reserved.
//

import UIKit

class Home: UIViewController {

    @IBOutlet weak var userButton: UIButton!
    @IBOutlet weak var backgroundImageView: UIImageView!
    @IBOutlet weak var backgroundMaskView: UIView!
    @IBOutlet weak var dialogView: UIView!
    @IBOutlet weak var popoverView: UIView!
    @IBOutlet weak var shareView: UIView!
    @IBOutlet weak var imageButton: UIButton!
    @IBOutlet weak var headerView: UIView!
    @IBOutlet weak var likeButton: UIButton!
    @IBOutlet weak var shareButton: UIButton!
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var authorLabel: UILabel!
    @IBOutlet weak var avatarImageView: UIImageView!
    @IBOutlet weak var favoritesLabel: UILabel!
    @IBOutlet weak var maskButton: UIButton!
    @IBOutlet weak var emailButton: UIButton!
    @IBOutlet weak var twitterButton: UIButton!
    @IBOutlet weak var facebookButton: UIButton!
    @IBOutlet weak var shareLabelsView: UIView!
    
    @IBAction func maskButtonDidPress(sender: AnyObject) {
        spring(0.5) {
            self.maskButton.alpha = 0
        }
        hideShareView()
        hidePopover()
    }
    func showMask() {
        self.maskButton.hidden = false
        self.maskButton.alpha = 0
        spring(0.5) {
            self.maskButton.alpha = 1
        }
    }
    @IBAction func likeButtonDidPress(sender: AnyObject) {
        
    }
    @IBAction func shareButtonDidPress(sender: AnyObject) {
        shareView.hidden = false
        showMask()
        shareView.transform = CGAffineTransformMakeTranslation(0, 200)
        emailButton.transform = CGAffineTransformMakeTranslation(0, 200)
        twitterButton.transform = CGAffineTransformMakeTranslation(0, 200)
        facebookButton.transform = CGAffineTransformMakeTranslation(0, 200)
        shareLabelsView.alpha = 0
        
        spring(0.5) {
            self.shareView.transform = CGAffineTransformMakeTranslation(0, 0)
            self.dialogView.transform = CGAffineTransformMakeScale(0.8, 0.8)
        }
        springWithDelay(0.5, 0.05, {
            self.emailButton.transform = CGAffineTransformMakeTranslation(0, 0)
            })
        springWithDelay(0.5, 0.10, {
            self.twitterButton.transform = CGAffineTransformMakeTranslation(0, 0)
            })
        springWithDelay(0.5, 0.15, {
            self.facebookButton.transform = CGAffineTransformMakeTranslation(0, 0)
            })
        springWithDelay(0.5, 0.2, {
            self.shareLabelsView.alpha = 1
            })
    }
    func hideShareView() {
        spring(0.5) {
            self.shareView.transform = CGAffineTransformMakeTranslation(0, 0)
            self.dialogView.transform = CGAffineTransformMakeScale(1, 1)
            self.shareView.hidden = true
        }
    }
    @IBAction func userButtonDidPress(sender: AnyObject) {
        popoverView.hidden = false
        
        let scale = CGAffineTransformMakeScale(0.3, 0.3)
        let translate = CGAffineTransformMakeTranslation(50, -50)
        popoverView.transform = CGAffineTransformConcat(scale, translate)
        popoverView.alpha = 0
        
        showMask()
        
        spring(0.5) {
            let scale = CGAffineTransformMakeScale(1, 1)
            let translate = CGAffineTransformMakeTranslation(0, 0)
            self.popoverView.transform = CGAffineTransformConcat(scale, translate)
            self.popoverView.alpha = 1
        }

    }
    func hidePopover() {
        spring(0.5) {
            self.popoverView.hidden = true
        }
    }
    @IBAction func imageButtonDidPress(sender: AnyObject) {
        
        springWithCompletion(0.5, {
            
            self.dialogView.frame = CGRectMake(0, 0, 320, 568)
            self.dialogView.layer.cornerRadius = 0
            self.imageButton.frame = CGRectMake(0, 0, 320, 240)
            self.likeButton.alpha = 0
            self.shareButton.alpha = 0
            self.userButton.alpha = 0
            self.headerView.alpha = 0
            
            }, { finished in
                self.performSegueWithIdentifier("homeToDetail", sender: self)
            })
    }
    
    override func preferredStatusBarStyle() -> UIStatusBarStyle {
        return UIStatusBarStyle.LightContent
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        insertBlurView(backgroundMaskView, UIBlurEffectStyle.Dark)
        insertBlurView(headerView, UIBlurEffectStyle.Dark)

        let scale = CGAffineTransformMakeScale(0.5, 0.5)
        let translate = CGAffineTransformMakeTranslation(0, -200)
        dialogView.transform = CGAffineTransformConcat(scale, translate)
        
        spring(0.5) {
            let scale = CGAffineTransformMakeScale(1, 1)
            let translate = CGAffineTransformMakeTranslation(0, 0)
            self.dialogView.transform = CGAffineTransformConcat(scale, translate)
        }
        
        animator = UIDynamicAnimator(referenceView: view)
    }
    
    
    
    var animator : UIDynamicAnimator!
    var attachmentBehavior : UIAttachmentBehavior!
    var gravityBehavior : UIGravityBehavior!
    var snapBehavior : UISnapBehavior!
    
    @IBOutlet var panRecognizer: UIPanGestureRecognizer!
    @IBAction func handleGesture(sender: AnyObject) {
        let myView = dialogView
        let location = sender.locationInView(view)
        let boxLocation = sender.locationInView(myView)
        
        if sender.state == UIGestureRecognizerState.Began {
//            remove the snapBehavior that was added at the end of last gesture
            animator.removeBehavior(snapBehavior)
            
//            without offsetFromCenter, it only attach to it, without rotating.
//            attachmentBehavior = UIAttachmentBehavior(item: myView, attachedToAnchor: location)
            
//            offsetFromCenter makes the rotating happen.
//            centerOffset is a vector FROM the center of the dialogView TO your fingertip position relative to dialogView
            let centerOffset = UIOffsetMake(boxLocation.x - CGRectGetMidX(myView.bounds), boxLocation.y - CGRectGetMidY(myView.bounds))
            attachmentBehavior = UIAttachmentBehavior(item: myView, offsetFromCenter: centerOffset, attachedToAnchor: location)
            
//            if frequency is greater than 0, it is not responsive, and seems like there are a lot of friction
            attachmentBehavior.frequency = 0
            
            animator.addBehavior(attachmentBehavior)
            
        } else if sender.state == UIGestureRecognizerState.Changed {
//            the attachmentBehavior is set to attachedToAnchor, now we need to update the anchorPoint consitantly while fingertip is moving
            attachmentBehavior.anchorPoint = location
        } else if sender.state == UIGestureRecognizerState.Ended {
//            detach 
            animator.removeBehavior(attachmentBehavior)
//            snap back to the device view center
            snapBehavior = UISnapBehavior(item: myView, snapToPoint: view.center)
            animator.addBehavior(snapBehavior)
            
            let translation = sender.translationInView(view)
            
            if translation.y > 100 {
                animator.removeBehavior(snapBehavior)
//                note items with "s", generally means swift is expecting an array, it is a sematic trick to remember
                var gravity = UIGravityBehavior(items: [myView])
                gravity.gravityDirection = CGVectorMake(0, 10)
                animator.addBehavior(gravity)
            }
        }
    }

}