Features

• Animate cell size while scrolling
• Rotate cell while scrolling
• Adds pagination in your collection view
• Show users that collection has more cells or data
• Customizeable with collection view's content insets
• Easy to integrate and use

Installation

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ gem install cocoapods

To integrate FAPaginationLayout into your Xcode project using CocoaPods, specify it in your Podfile:

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '9.0'
use_frameworks!

target '<Your Target Name>' do
pod 'FAPaginationLayout'
end

Then, run the following command:

$ pod install

Usage

Step 1

• Set the collection view flow layout as FAPaginationLayout as given below,

Step 2 (With cells size animation while scrolling)

• Set the contentInsets of collection view,

collectionView.contentInset = UIEdgeInsetsMake(0, 30, 0, 30)

• Set the collectionView's item size according to collectionView's content insets and scale/animate it accordingly,

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    updateCellsLayout()
}

func updateCellsLayout()  {

    let centerX = collectionView.contentOffset.x + (collectionView.frame.size.width)/2

    for cell in collectionView.visibleCells {
        var offsetX = centerX - cell.center.x
        if offsetX < 0 {
            offsetX *= -1
        }
        cell.transform = CGAffineTransform.identity
        let offsetPercentage = offsetX / (view.bounds.width * 2.7)
        let scaleX = 1-offsetPercentage
        cell.transform = CGAffineTransform(scaleX: scaleX, y: scaleX)
    }
}


func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    var cellSize: CGSize = collectionView.bounds.size

    cellSize.width -= collectionView.contentInset.left * 2
    cellSize.width -= collectionView.contentInset.right * 2
    cellSize.height = cellSize.width

    return cellSize
}

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    updateCellsLayout()
}

Step 2 (With cells rotation animation while scrolling)

• Set the contentInsets of collection view,

collectionView.contentInset = UIEdgeInsetsMake(0, 30, 0, 30)

• Set the collectionView's item size according to collectionView's content insets and scale/animate it accordingly,

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    updateCellsLayout()
}

func updateCellsLayout()  {

    let centerX = collectionView.contentOffset.x + (collectionView.frame.size.width)/2

    for cell in collectionView.visibleCells {

        var offsetX = centerX - cell.center.x
        if offsetX < 0 {
            offsetX *= -1
        }

        if offsetX > 0 {

            let offsetPercentage = offsetX / view.bounds.width
            let rotation = 1 - offsetPercentage
            cell.transform = CGAffineTransform(rotationAngle: rotation - 45)
        }
    }
}


func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    var cellSize: CGSize = collectionView.bounds.size

    cellSize.width -= collectionView.contentInset.left * 2
    cellSize.width -= collectionView.contentInset.right * 2
    cellSize.height = cellSize.width

    return cellSize
}

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    updateCellsLayout()
}

Step 2 (Without cell size animation)

• Set the content insets of collectionView as per your need

collectionView.contentInset = UIEdgeInsetsMake(0, 20, 0, 20)

• Set the collectionView's item size according to collectionView's content insets.

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    var cellSize: CGSize = collectionView.bounds.size
    cellSize.width -= collectionView.contentInset.left
    cellSize.width -= collectionView.contentInset.right

    return cellSize
}

• Now run the Xcode project and enjoy!

License

This project is licensed under the MIT License.

Author

Fahid Attique - https://github.com/fahidattique55

Contributors

Evyasafmordechai - https://github.com/Evyasafmordechai orlandoamorim - https://github.com/orlandoamorim