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我打开了我的一个项目，Xcode 要求我将源代码更新为 Swift 3。单击保存后，我得到了预期的错误。创建 fetchRequest 时发生错误。 (错误信息在第8行)
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let appDelegate = UIApplication.shared().delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext!
let fetchRequest = NSFetchRequest(entityName:"Sessions") //<- Error error message: generic parameter 'ResultType' could not be inferred
do {
sessions = try managedContext.fetch(fetchRequest) as! [Sessions]
} catch let error as NSError {
print("Could not fetch \(error), \(error.userInfo)")
}
print("fetched")
self.tableView.reloadData()
}
}