A custom View with fancy collectionView 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 cells 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 scrolls, this will get called when it stops with new parent collectionview's index.
// You can use this message as a trigger to fetch related child collection view's information.
// 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
}You can customize the layout objects used by parentCollectionView and childCollectionView by
let chainView = ChainPageCollectionView(viewType: .normal,
parentColectionViewLayout: #yourlayout,
childCollectionViewLayout: #yourlayout)You can use parentCollectionViewItemSize and childCollectionViewItemSize to set the desired itemSize.
The default behaviour of this view is that parent collection view will take 3/4 of this view's height and child collection view takes the rest. You can set viewType to a customized ration with type customParentHeight(#SomeInt, #SomeInt)
Expanding collection is released under the MIT license. See LICENSE for details.