Question

我在Realm中有一个商品列表。使用rxSwift将项绑定到UITableview，它运行正常。当我删除来自Realm的一个项目，它遇到了这个错误＆＃34;绑定错误到UI：objectDeleted＆＃34; 在tableviewcell中有这段代码

    var model: ServerMailCellModel? {
    didSet {
        subjectLabel.text = model?.subject
        timeLabel.text = model?.timeString
        fromLabel.text = model?.from
        // this one make the **fatal error of bind to UI: objectdeleted**
        model?.isReaded.bind(to: statusDotView.rx.isHidden).addDisposableTo(bag) 
        scrollView.datasource = model!.attachments
    }
}

isReaded Observable就像这样

    lazy var isReaded: Observable<Bool> = {
    // mail is an realm object
    guard let mail = StoreManager.mail(with: mailID) else {return  Observable.empty()}

    // change is a observable that contains realm object property change info
    let change = StoreManager.mailChange(with: mailID)

    let o: Observable<Bool> = change
        .filter({
            let name: String = $0.name
            return (name == "flags")

        })
        .map{ property in
            let v = property.newValue! as! Int
            return ((v &  MCOMessageFlag.seen.rawValue) != 0)
        }.startWith(mail.isReaded)
    return o
}()

有什么迹象表明我的代码有什么问题。我是rxswift的新手。

Answer 1

我发现当从域中删除对象时，changeObservable会发出错误。像这样修复错误：

    lazy var isReaded: Driver<Bool> = {
    guard let mail = StoreManager.mail(with: mailID) else {return  Observable.empty().asDriver(onErrorJustReturn: false)}
    let change = StoreManager.mailChange(with: mailID)

    let o: Driver<Bool> = change
        .filter({
            let name: String = $0.name
            return (name == "flags")

        })
        .map{ property in
            let v = property.newValue! as! Int
            return ((v &  MCOMessageFlag.seen.rawValue) != 0)
        }.startWith(mail.isReaded).asDriver(onErrorJustReturn: false)
    return o
}()

捕获错误并返回默认值。

rxCocoa绑定错误到UI：objectDeleted

1 个答案: