在 ViewController 中實施 ResearchKit 以進行調查

Question

编辑：不确定这是否可能是我问题的根源，但是应用程序委托中的这段代码会是这不起作用的原因吗？

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    let navigationController = self.window!.rootViewController as! UINavigationController
    let controller = navigationController.topViewController as! HomeViewController
    controller.managedObjectContext = self.managedObjectContext
    return true
}

我正在尝试将调查功能添加到集成了 ResearchKit 的应用程序。我已经完成了Ray Wenderlich的设置指南和其他一些教程。 但是，当我过渡到我想开发的应用程序时，我有点卡住了。

我被抛出一个错误：Cannot assign value of type 'HomeviewController to type 'ORKTaskViewControllerDelegate?'

这是我正在使用的代码：

class HomeViewController: UIViewController {
var managedObjectContext: NSManagedObjectContext?
@IBAction func surveyTapped(sender: AnyObject) {
    let taskViewController = ORKTaskViewController(task: SurveyTask, taskRunUUID: nil)
    taskViewController.delegate = self
    presentViewController(taskViewController, animated: true, completion: nil)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.destinationViewController.isKindOfClass(NewRideViewController) {
        if let newRideViewController = segue.destinationViewController as? NewRideViewController {
            newRideViewController.managedObjectContext = managedObjectContext
        }
    }
}
}

基于此错误语法的类似问题，用户添加了另一个控制器类，但哪个超出了我的范围。 非常感谢您的帮助，谢谢StackExchange！

Answer 1

看起来您还没有扩展视图控制器来实现ORKTaskViewControllerDelegate ORKTaskViewController委托，您的 VC 代码应如下所示 -

import ResearchKit
class HomeVC: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    @IBAction func surveyTapped(sender: AnyObject) {
        let taskViewController = ORKTaskViewController(task: SurveyTask, taskRunUUID: nil)
        taskViewController.delegate = self
        presentViewController(taskViewController, animated: true, completion: nil)
    }
}
extension HomeVC: ORKTaskViewControllerDelegate {
    func taskViewController(taskViewController: ORKTaskViewController, didFinishWithReason reason: ORKTaskViewControllerFinishReason, error: NSError?) {
    }
}