我正在尝试根据 UITableViewCell 中的 UISegmentedControl 中的值更改从 UITableView 添加删除单元格。
问题是存在循环依赖，tableView 一直在重新加载。我通过使用 distinctUntilChanged 避免了这种无限重新加载，但有时仍然会调用两次重新加载。
我的目标是根据段控件中的选择更改行数。
Code in UITableViewCell
extension CardTableViewCell {
/// This function is called every time in `cellForRowAtIndexPath` for the tableView.
func bind(viewModel: TableViewViewModel?) {
self.viewModel = viewModel
if let viewModel = viewModel {
segment.rx.selectedSegmentIndex
.asDriver()
.flatMap { Driver.just($0 == 0)}
.distinctUntilChanged()
.drive(onNext: { value in
print(">>>> VALUE CHANGED \(value)")
viewModel.reloadTableView()}
// Here when I reload the table view this is called again and a cyclic dependency is created
) >>> disposeBag
}
}
}
The console returns this
⚠️ Reentrancy anomaly was detected.
> Debugging: To debug this issue you can set a breakpoint in /Users/harshvishwakarma/Documents/GitHub/banking-app-ios/Pods/RxSwift/RxSwift/Rx.swift:97 and observe the call stack.
> Problem: This behavior is breaking the observable sequence grammar. `next (error | completed)?`
This behavior breaks the grammar because there is overlapping between sequence events.
Observable sequence is trying to send an event before sending of previous event has finished.
> Interpretation: This could mean that there is some kind of unexpected cyclic dependency in your code,
or that the system is not behaving in the expected way.
> Remedy: If this is the expected behavior this message can be suppressed by adding `.observeOn(MainScheduler.asyncInstance)`
or by enqueing sequence events in some other way.
最佳答案
您将需要使用类似[RxDataSources][1] 的库或以其他方式编写您自己的数据源类。默认数据源的行为是在 TableView 上调用 reloadData()，但您需要一个能够按需追加/删除单元格而不是始终加载整个 tableView 的行为。
如果你觉得RxDataSources重量太重，那你可以自己写一个简单的数据源。这是一个例子:https://github.com/danielt1263/RxMultiCounter/blob/master/RxMultiCounter/RxExtensions/RxSimpleAnimatableDataSource.swift
关于ios - UITableViewCell 中的 Reactive<UISegmentedControl>，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57369077/