NSFetchRequest参数误差

Question

下面的代码出现了一个编译器错误。Scores是动态生成的数据实体(Codegen - Class Defnition)。确切的错误是：

无法将“NSFetchRequest”类型的值转换为预期的参数类型“NSFetchRequest”

override func viewWillAppear(_ animated: Bool) { 
    super.viewWillAppear(animated)

    let request: NSFetchRequest<Scores> = Scores.fetchRequest()
    do {

        scores = try context.fetch(request)
    } catch {
        print("Error")
    }

    tableView.reloadData()
}

错误发生在context.fetch()调用上。Xcode 8.2.1

Answer 1

用下面的行替换获取请求创建

let request:NSFetchRequest<NSFetchRequestResult> = Scores.fetchRequest()

这在类似问题上有更多的线索。https://stackoverflow.com/a/37811827/6249982