FAPaginationLayout

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FAPaginationLayout

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Collection view pagination layout

// repository documentation

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![Alt text](http://i.imgur.com/jWeALpn.png "FAPaginationLayout-Logo")

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## 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](http://cocoapods.org) is a dependency manager for Cocoa projects. You can install it with the following command:

```bash
$ gem install cocoapods
```

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

```ruby
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:

```bash
$ pod install
```

## Usage

#### Step 1

* Set the collection view flow layout as ``` FAPaginationLayout ``` as given below,

![Alt text](http://i.imgur.com/r697FRw.png "FAPaginationLayout-step1")

#### 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,

```swift

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,

```swift

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.

```swift

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

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