SAParallaxViewControllerSwift realizes parallax scrolling with blur effect. In addition, it realizes seamless opening transition.
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README.md

SAParallaxViewControllerSwift

Platform Language License Version

SAParallaxViewControllerSwift realizes parallax scrolling with blur effect. In addition, it realizes seamless opening transition.

Features

  • Parallax scrolling
  • Parallax scrolling with blur accessory view
  • Seamlees opening transition
  • Support Swift2.3
  • Support Swift3

Installation

CocoaPods

SAParallaxViewControllerSwift is available through CocoaPods. If you have cocoapods 0.36 beta or greater, you can install it, simply add the following line to your Podfile:

pod "SAParallaxViewControllerSwift"

Manually

Add the SAParallaxViewControllerSwift directory to your project.

Usage

If you install from cocoapods, You have to white import SAParallaxViewControllerSwift.

Extend SAParallaxViewController like this.

class ViewController: SAParallaxViewController {
    override init() {
        super.init()
    }

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

If you want to use UICollectionViewDataSource, implement extension like this. You can set image with cell.setImage(). You can add some UIView member classes to cell.containerView.accessoryView.

extension ViewController: UICollectionViewDataSource {
    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = super.collectionView(collectionView, cellForItemAt: indexPath) as! SAParallaxViewCell

        let index = indexPath.row % 6
        let imageName = String(format: "image%d", index + 1)
        if let image = UIImage(named: imageName) {
            cell.setImage(image)
        }
        let title = ["Girl with Room", "Beautiful sky", "Music Festival", "Fashion show", "Beautiful beach", "Pizza and beer"]
        let label = UILabel(frame: cell.containerView.accessoryView.bounds)
        label.textAlignment = .Center
        label.text = title[index]
        label.textColor = .whiteColor()
        label.font = .systemFontOfSize(30)
        cell.containerView.accessoryView.addSubview(label)

        return cell
    }
}

If you want to use UICollectionViewDelegate, implement extension like this.

You must copy cell.containerView to viewController.trantisionContainerView because to use opening transition. When you copy them, use containerView.setViews(cells: cells, view: view). Set viewController.transitioningDelegate as self, finally call self.presentViewController().

extension ViewController: UICollectionViewDelegate {
    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        super.collectionView(collectionView, didSelectItemAt: indexPath)

        guard let cells = collectionView.visibleCells as? [SAParallaxViewCell] else { return }
        let containerView = SATransitionContainerView(frame: view.bounds)
        containerView.setViews(cells, view: view)

        let viewController = DetailViewController()
        viewController.transitioningDelegate = self
        viewController.trantisionContainerView = containerView

        present(viewController, animated: true, completion: nil)
    }
}

Extend SADetailViewController like this.

SADetailViewController is detail view controller for parallax cell.

class DetailViewController: SADetailViewController {
    override init() {
        super.init()
    }

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

Customize

You can change parallax start position with function of cell.containerView.

func setParallaxStartPosition(#y: CGFloat)

You can change height of cell.containerView.accessoryView.

func setAccessoryViewHeight(height: CGFloat)

You can change blur size of cell.containerView.accessoryView.

func setBlurSize(size: CGFloat)

You can change blur color of cell.containerView.accessoryView.

func setBlurColor(color: UIColor)

You can change blur color alpha of cell.containerView.accessoryView.

func setBlurColorAlpha(alpha: CGFloat)

Requirements

Author

Taiki Suzuki, s1180183@gmail.com

License

SAParallaxViewControllerSwift is available under the MIT license. See the LICENSE file for more info.