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Swift CollectioView
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// | |
// LibraryViewController.swift | |
// WIMB | |
// | |
// Created by Gil Felot on 16/03/16. | |
// Copyright © 2016 gfelot. All rights reserved. | |
// | |
import UIKit | |
import Parse | |
let parallaxCellIdentifier = "parallaxCell" | |
class LibraryViewController: UICollectionViewController { | |
var bookImages = [String?]() | |
var bookTitle = [String?]() | |
var nbBooks = 0 | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
let query = PFQuery(className: "Book") | |
query.whereKey("userID", equalTo: (PFUser.currentUser()?.objectId)!) | |
query.findObjectsInBackgroundWithBlock { (books, error) in | |
guard (books != nil) else { | |
return | |
} | |
for book in books! { | |
print("\n\n\(book)") | |
if let coverString = book["cover"] { | |
self.bookImages.append(coverString as? String) | |
} else { | |
self.bookImages.append(nil) | |
} | |
if let titleString = book["title"] { | |
self.bookTitle.append(titleString as? String) | |
} else { | |
self.bookTitle.append("No Title") | |
} | |
} | |
} | |
let collectionView = self.collectionView | |
collectionView?.reloadData() | |
} | |
override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { | |
print("NB Book: \(bookTitle.count)") | |
return bookTitle.count | |
} | |
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { | |
let parallaxCell = collectionView.dequeueReusableCellWithReuseIdentifier(parallaxCellIdentifier, forIndexPath: indexPath) as! ParallaxCollectionViewCell | |
let imgString = bookImages[indexPath.row] | |
if imgString != nil { | |
if let url = NSURL(string: imgString!) { | |
print("Cover Found ") | |
parallaxCell.imageView.pin_setImageFromURL(url) | |
} | |
}else { | |
print("Cover Not Found") | |
parallaxCell.image = UIImage(named: "iu")! | |
} | |
return parallaxCell | |
} | |
override func scrollViewDidScroll(scrollView: UIScrollView) { | |
guard let collectionView = self.collectionView else {return} | |
guard let visibleCells = collectionView.visibleCells() as? [ParallaxCollectionViewCell] else {return} | |
for parallaxCell in visibleCells { | |
let yOffset = ((collectionView.contentOffset.y - parallaxCell.frame.origin.y) / ImageHeight) * OffsetSpeed | |
parallaxCell.offset(CGPointMake(0.0, yOffset)) | |
} | |
} | |
@IBAction func logout(sender: AnyObject) { | |
// PFUser.logOut() | |
// self.performSegueWithIdentifier("logout", sender: self) | |
} | |
} |
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