ResearchKit取消按钮不工作

Question

我正在使用ResearchKit进行一个项目(Swift)，我的取消栏按钮不起作用。我已经找到了以下方法，可以使其工作

- (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];
    }
}

我得到丢弃结果并取消弹出，但是当我点击“丢弃结果”选项时什么都不会发生。

我要不要检查一下其他的东西？我应该把它连接到什么地方吗？

Answer 1

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

例如，请参见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)
}