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https://github.com/MaherKSantina/MSPeekCollectionViewDelegateImplementation
A custom paging behavior that peeks the previous and next items in a collection view
https://github.com/MaherKSantina/MSPeekCollectionViewDelegateImplementation
cell collectionview collectionviewlayout delegate implementation ios peek swift
Last synced: about 1 month ago
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A custom paging behavior that peeks the previous and next items in a collection view
- Host: GitHub
- URL: https://github.com/MaherKSantina/MSPeekCollectionViewDelegateImplementation
- Owner: MaherKSantina
- License: mit
- Created: 2018-06-11T05:48:31.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2023-11-01T13:44:04.000Z (11 months ago)
- Last Synced: 2024-07-19T12:36:29.431Z (about 2 months ago)
- Topics: cell, collectionview, collectionviewlayout, delegate, implementation, ios, peek, swift
- Language: Swift
- Homepage: https://medium.com/@maher.santina90/how-to-create-cells-that-peek-on-the-sides-like-ios-11-app-store-ef4bb54c0c7d
- Size: 235 KB
- Stars: 355
- Watchers: 6
- Forks: 32
- Open Issues: 16
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
Awesome Lists containing this project
- awesome-ios - MSPeekCollectionViewDelegateImplementation - A custom paging behavior that peeks the previous and next items in a collection view. (UI / Table View / Collection View)
- awesome-ios-star - MSPeekCollectionViewDelegateImplementation - A custom paging behavior that peeks the previous and next items in a collection view. (UI / Table View / Collection View)
README
# MSPeekCollectionViewDelegateImplementation
# Version 3.0.0 is here! 🎉
The peeking logic is now done using a custom `UICollectionViewLayout` which makes it easier to integrate and will introduce less bugs! (And hopefully it will solve all the issues you were facing)
# Migrating from 2.0.0 to 3.0.0
I've tried to keep minimal effort to migrate from v2 to v3. Here are the steps:
1- Replace `MSPeekCollectionViewDelegateImplementation` initialization with `MSCollectionViewPeekingBehavior`
2- On your `collectionView`, call `configureForPeekingBehavior` like this:
```swift
collectionView.configureForPeekingBehavior(behavior: behavior)
```
3- Set the collection view's delegate as the view controller (Or any other class you want)
4- In the collection view delegate function `scrollViewWillEndDragging`, call the behavior's `scrollViewWillEndDragging` like this:
```swift
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer) {
behavior.scrollViewWillEndDragging(scrollView, withVelocity: velocity, targetContentOffset: targetContentOffset)
}
```
5- ???
6- Profit 💰
You can check out the example for a detailed use
# Introduction
[](https://travis-ci.org/MaherKSantina/MSPeekCollectionViewDelegateImplementation)
Current design trends require complex designs which allow horizontal scrolling inside vertical scrolling. So to show the users that they can scroll vertically, a peeking item should be shown on the side. This library does exactly that.
I wrote this library because there's no pod that does this simple feature. Also, other libraries require me to inherit from a UICollectionViewController, which doesn't give alot of freedom if I'm inheriting from other View Controllers.
## Example
To run the example project, clone the repo, and run `pod install` from the Example directory first.
## Requirements
- XCode 11.2.1
- Swift 5
This pod will probably work on older versions of XCode but I haven't tested it.
## Installation
MSPeekCollectionViewDelegateImplementation is available through [CocoaPods](https://cocoapods.org). To install
it, simply add the following line to your Podfile:
```ruby
pod 'MSPeekCollectionViewDelegateImplementation'
```
## Usage
### Storyboard
1. Drag-Drop a `UICollectionView`
2. Set the reuse identifier for the collection view's cell to `Cell`
3. Create a reference for the collection view
```swift
@IBOutlet weak var collectionView: UICollectionView!
```
4. Bind collection view to outlet
5. Import library
```swift
import MSPeekCollectionViewDelegateImplementation
```
6. Create a variable of type `MSCollectionViewPeekingBehavior`
```swift
var behavior: MSCollectionViewPeekingBehavior!
```
7. In `viewDidLoad()`, , initialize the behavior and configure the `collectionView` for peek behavior:
```swift
behavior = MSCollectionViewPeekingBehavior()
collectionView.configureForPeekingBehavior(behavior: behavior)
```
Or you can use whatever arguments from the ones below (Can be combined together as needed):
```swift
behavior = MSCollectionViewPeekingBehavior(cellSpacing: 10)
```
```swift
behavior = MSCollectionViewPeekingBehavior(cellPeekWidth: 20)
```
```swift
//minimumItemsToScroll is the minimum number of items that can be scrolled
behavior = MSCollectionViewPeekingBehavior(minimumItemsToScroll: 1)
```
```swift
//maximumItemsToScroll is the maximum number of items that can be scrolled if the scroll distance is large
behavior = MSCollectionViewPeekingBehavior(maximumItemsToScroll: 3)
```
```swift
//numberOfItemsToShow is the number of items that will be shown at the same time.
behavior = MSCollectionViewPeekingBehavior(numberOfItemsToShow: 3)
```
8. In `viewDidLoad()`, set the collection view's delegate to self:
```swift
collectionView.delegate = self
```
9. In the collection view delegate function `scrollViewWillEndDragging`, call the behavior's `scrollViewWillEndDragging` like this:
```swift
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer) {
behavior.scrollViewWillEndDragging(scrollView, withVelocity: velocity, targetContentOffset: targetContentOffset)
}
```
10. Create the data source implementation as an extension for the `ViewController`
```swift
extension ViewController: UICollectionViewDataSource {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 4
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
//TODO: Configure cell
return cell
}
}
```
11. In `viewDidLoad()`, Set the collection view's data source to `self`
```swift
collectionView.dataSource = self
```
### Working Example
```swift
import UIKit
import MSPeekCollectionViewDelegateImplementation
class ViewController: UIViewController {
@IBOutlet weak var collectionView: UICollectionView!
var behavior = MSCollectionViewPeekingBehavior()
override func viewDidLoad() {
super.viewDidLoad()
collectionView.configureForPeekingBehavior(behavior: behavior)
collectionView.delegate = self
collectionView.dataSource = self
}
}
extension ViewController: UICollectionViewDataSource {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 4
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
cell.contentView.backgroundColor = UIColor.red
return cell
}
}
extension ViewController: UICollectionViewDelegate {
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer) {
behavior.scrollViewWillEndDragging(scrollView, withVelocity: velocity, targetContentOffset: targetContentOffset)
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
print(behavior.currentIndex)
}
}
```
## Features
### Scrolling to a specific item
The `MSCollectionViewPeekingBehavior` now has a function to scroll to a specific index
```swift
public func scrollToItem(at index: Int, animated: Bool)
```
You can do something like:
```swift
behavior.scrollToItem(at: 1, animated: true)
```
### Listen to index changes
You can use the scroll view's delegate function to do that (Make sure you conform to `UICollectionViewDelegate`):
```swift
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
print(behavior.currentIndex)
}
```
## Customization
### Vertical Scroll Direction
The implementation supports collection views with vertical directions and will automatically position cells correctly, you can set the scrolling and peeking to be vertical using:
```swift
delegate = MSCollectionViewPeekingBehavior(scrollDirection: .vertical)
collectionView.configureForPeekingBehavior(behavior: behavior)
```
## Author
Maher Santina, [email protected]
## Sponsor
If you're liking this repo I'd really appreciate it if you sponsor me (Orange Juice) so that I can continue supporting this project. I'm also working on adding more reusable UI elements similar to this one to make developer's lives easier. Please see [my sponsor page](https://github.com/sponsors/MaherKSantina/) for more details
## Contributing
Any contribution is highly appreciated, please see [CONTRIBUTING.md](https://github.com/MaherKSantina/MSPeekCollectionViewDelegateImplementation/blob/master/CONTRIBUTING.md) for more info.
## License
MSPeekCollectionViewDelegateImplementation is available under the MIT license. See the [LICENSE](https://github.com/MaherKSantina/MSPeekCollectionViewDelegateImplementation/blob/master/LICENSE) file for more info.