A custom View with two level chained collection views and fancy transition animation.
- iOS 9.0+
- Xcode 8
Update your Podfile to include the following:
pod 'ChainPageCollectionView', '~> 1.0'Run pod install.
NOTE: If you can not find the pod target. Please follow: https://stackoverflow.com/questions/31065447/no-such-module-when-i-use-cocoapods to build your pod target.
import ChainPageCollectionView- Create ChainPageCollectionView
// chainView is this view controller's property.
chainView = ChainPageCollectionView(viewType: .normal)
chainView.delegate = self- Register cell for
parentCollectionViewandchildCollectionView
chainView.parentCollectionView.register(#cellType, forCellWithReuseIdentifier:#cellIdentifier)
chainView.childCollectionView.register(#cellType, forCellWithReuseIdentifier:#cellIdentifier)- Implement
ChainPageCollectionViewProtocol
func parentCollectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// return your parent data source count.
}
func parenCollectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// Dequeue and configure your parent collectionview cell
}
func childCollectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// return your child data source count.
}
func childCollectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// Dequeue and configure your child collectionview cell
}- Update child collection view data source when parent index has changed.
// You will get notified by following protocol method.
func childCollectionView(_ collectionView: UICollectionView, parentCollectionViewIndex: Int) {
// When parent collection view's scroll stops, this will get called with new parent collectionview's index.
// You can use this message to fetch related child collection view's new data.
// Once you have the latest child collection view's data, set `childCollectionViewDataReady` to `true`.
// NOTE: This is important to be set, otherwise your child collection view propably will not show up again.
chainView.childCollectionViewDataReady = true
}For now ChainPageCollectionView support two types of child collection view transition animation.
public enum ChainPageChildAnimationType {
case slideOutSlideIn
case shrinkOutExpandIn
}Default is slideOutSlideIn, you can set it via initialization stage.
let chainView = ChainPageCollectionView(viewType: .normal,
childAnimationType: #yourchoice)You can customize the layout objects by passing them via ChainPageCollectionView's designated initializer.
let chainView = ChainPageCollectionView(viewType: .normal,
parentColectionViewLayout: #yourlayout,
childCollectionViewLayout: #yourlayout)You can use parentCollectionViewItemSize and childCollectionViewItemSize to set related layouts' itemSize.
The default behaviour of this view is that parent collection view takes 3/4 height of this view and child collection view takes the rest. You can set viewType to a customized ratio with type customParentHeight(#SomeInt, #SomeInt)
let chainView = ChainPageCollectionView(viewType: .customParentHeight(28, 12))Expanding collection is released under the MIT license. See LICENSE for details.