ResearchKit取消按钮不工作

Question

我正在使用ResearchKit处理一个项目（Swift），而我的"取消"栏按钮不起作用。我发现了以下方法，应该使它工作

- (void)setCancelButtonItem:(UIBarButtonItem *)cancelButtonItem {
    [super setCancelButtonItem:cancelButtonItem];
    [cancelButtonItem setTarget:self];
    [cancelButtonItem setAction:@selector(cancelButtonHandler:)];
}
- (void)cancelButtonHandler:(id)sender {
    STRONGTYPE(self.taskViewController.delegate) strongDelegate = self.taskViewController.delegate;
    if ([strongDelegate respondsToSelector:@selector(taskViewController:didFinishWithReason:error:)]) {
        [strongDelegate taskViewController:self.taskViewController didFinishWithReason:ORKTaskViewControllerFinishReasonDiscarded error:nil];
    }
}

我得到了"放弃结果"one_answers"取消"弹出窗口，但当我点击"丢弃结果"选项时，什么都没有发生。

我应该查一下别的东西吗？我应该把它连接到什么地方吗？

Answer 1

单击该按钮应调用任务视图控制器委托中的taskViewController(taskViewController: ORKTaskViewController, didFinishWithReason reason: ORKTaskViewControllerFinishReason, error: NSError?)方法。您必须手动关闭任务视图控制器。

例如，请参阅ORKCatalog的TaskListViewController.swift:中的实现

func taskViewController(taskViewController: ORKTaskViewController, didFinishWithReason reason: ORKTaskViewControllerFinishReason, error: NSError?) {
    /*
        The `reason` passed to this method indicates why the task view
        controller finished: Did the user cancel, save, or actually complete
        the task; or was there an error?
        The actual result of the task is on the `result` property of the task
        view controller.
    */
    taskResultFinishedCompletionHandler?(taskViewController.result)
    taskViewController.dismissViewControllerAnimated(true, completion: nil)
}