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add: UITableView, UICollectionView prefetching publisher #83

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add: UITableView, UICollectionView prefetching publisher #83

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e1f7a08
add: UITableView prefetching publisher
minhaaan Dec 30, 2022
424f0b8
add: UICollectionView prefetching publisher
minhaaan Dec 30, 2022
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32 changes: 32 additions & 0 deletions Sources/CombineCocoa/Controls/UICollectionView+Combine.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -77,10 +77,29 @@ public extension UICollectionView {
.map { ($0[1] as! UICollectionReusableView, $0[2] as! String, $0[3] as! IndexPath) }
.eraseToAnyPublisher()
}

/// Combine wrapper for `tableView(_:prefetchRowsAt:)`
var prefetchItemsAtPublisher: AnyPublisher<[IndexPath], Never> {
return (prefetchingDelegateProxy as! CollectionViewDataSourcePrefetchingProxy)
.prefetchItemsSubject
.eraseToAnyPublisher()
}

/// Combine wrapper for `tableView(_:cancelPrefetchingForRowsAt:)`
var cancelPrefetchingForItemsAtPublisher: AnyPublisher<[IndexPath], Never> {
let selector = #selector(UICollectionViewDataSourcePrefetching.collectionView(_:cancelPrefetchingForItemsAt:))
return prefetchingDelegateProxy.interceptSelectorPublisher(selector)
.map { ($0[1]) as! [IndexPath] }
.eraseToAnyPublisher()
}

override var delegateProxy: DelegateProxy {
CollectionViewDelegateProxy.createDelegateProxy(for: self)
}

var prefetchingDelegateProxy: DelegateProxy {
CollectionViewDataSourcePrefetchingProxy.createDelegateProxy(for: self)
}
}

@available(iOS 13.0, *)
Expand All @@ -89,5 +108,18 @@ private class CollectionViewDelegateProxy: DelegateProxy, UICollectionViewDelega
object.delegate = self
}
}

@available(iOS 13.0, *)
internal class CollectionViewDataSourcePrefetchingProxy: DelegateProxy, UICollectionViewDataSourcePrefetching, DelegateProxyType {
internal let prefetchItemsSubject = PassthroughSubject<[IndexPath], Never>()

func setDelegate(to object: UICollectionView) {
object.prefetchDataSource = self
}

func collectionView(_ collectionView: UICollectionView, prefetchItemsAt indexPaths: [IndexPath]) {
prefetchItemsSubject.send(indexPaths)
}
}
#endif
// swiftlint:enable force_cast
32 changes: 32 additions & 0 deletions Sources/CombineCocoa/Controls/UITableView+Combine.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -117,10 +117,29 @@ public extension UITableView {
.map { $0[1] as! IndexPath }
.eraseToAnyPublisher()
}

/// Combine wrapper for `tableView(_:prefetchRowsAt:)`
var prefetchItemsAtPublisher: AnyPublisher<[IndexPath], Never> {
return (prefetchingDelegateProxy as! TableViewDataSourcePrefetchingProxy)
.prefetchItemsSubject
.eraseToAnyPublisher()
}

/// Combine wrapper for `tableView(_:cancelPrefetchingForRowsAt:)`
var cancelPrefetchingForItemsAtPublisher: AnyPublisher<[IndexPath], Never> {
let selector = #selector(UITableViewDataSourcePrefetching.tableView(_:cancelPrefetchingForRowsAt:))
return prefetchingDelegateProxy.interceptSelectorPublisher(selector)
.map { ($0[1]) as! [IndexPath] }
.eraseToAnyPublisher()
}

override var delegateProxy: DelegateProxy {
TableViewDelegateProxy.createDelegateProxy(for: self)
}

var prefetchingDelegateProxy: DelegateProxy {
TableViewDataSourcePrefetchingProxy.createDelegateProxy(for: self)
}
}

@available(iOS 13.0, *)
Expand All @@ -129,5 +148,18 @@ private class TableViewDelegateProxy: DelegateProxy, UITableViewDelegate, Delega
object.delegate = self
}
}

@available(iOS 13.0, *)
internal class TableViewDataSourcePrefetchingProxy: DelegateProxy, UITableViewDataSourcePrefetching, DelegateProxyType {
internal let prefetchItemsSubject = PassthroughSubject<[IndexPath], Never>()

func setDelegate(to object: UITableView) {
object.prefetchDataSource = self
}

func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
prefetchItemsSubject.send(indexPaths)
}
}
#endif
// swiftlint:enable force_cast