CODEWITHSUNDEEP
iosiphonerx-swift
Kashif Jilani
Kashif Jilani

Reputation: 1257

Array of observable element in RxSwift

I am new to RxSwift and working on some sample to test. I have show some data on uitableview with the help of RxSwift. However when I try to delete any item from tableview and reload. Observable array didn't update and due to this scrolling at last item crashes. Below is the code, please help me know what I am doing wrong.

self.itemArray = NSMutableArray(objects: "First Item","Second Item","Third Item","Fourth Item","Fifth Item","Sixth Item","Seventh Item","Eight Item","Nineth Item","Tenth Item","Eleventh Item","Twelveth Item","Thirtheenth Item","Fourtheenth Item","Fifteenth Item","Sixteenth Item","Seventhenth Item","First Item","Second Item","Third Item","Fourth Item","Fifth Item","Sixth Item","Seventh Item","Eight Item","Nineth Item","Tenth Item","Eleventh Item","Twelveth Item","Thirtheenth Item","Fourtheenth Item","Fifteenth Item","Sixteenth Item","Seventhenth Item")


var seqValue = Observable.just(self.itemArray)
seqValue
    .bind(to: rxtableView.rx.items) { (tableView, row, seqValue) in
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell")!
        cell.textLabel?.text = self.itemArray.object(at: row) as? String
        cell.backgroundColor = .clear
        return cell
    }.disposed(by: disposeBag)


self.rxtableView.rx.itemDeleted
    .subscribe(onNext: { [unowned self]indexPath in
        self.itemArray.removeObject(at: indexPath.row)
        seqValue = Observable.just(self.itemArray)
        self.rxtableView.reloadData()
    }).addDisposableTo(disposeBag)

Upvotes: 1

Views: 4499

Answers (2)

Xavier Lowmiller
Xavier Lowmiller

Reputation: 1391

I think what you want is RxSwift's Variable:

let seqValue = Variable<String>(["First Item", ...])

so you in your .itemDeleted you can modify that variable:

seqValue.value.remove(at: indexPath.row)

Variable is an Observable, so changes are propagated automatically. No need to call reloadData().

Upvotes: 0

Maxim Volgin
Maxim Volgin

Reputation: 4077

make it BehaviorSubject, i.e. -

var seqValue = BehaviorSuject.create(self.itemArray)

and instead of 'seqValue = Observable.just(self.itemArray)' do

seqValue.onNext(self.itemArray)

calling '.reloadData()' is not necessary

Upvotes: 1

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