ios - CNContactPickerDelegate 的 contactPickerDidCancel 从未调用过

Question

当我使用 CNContactPickerViewController 选择没有关联号码的联系人时，永远不会调用此委托(delegate)方法。

/*!
 * @abstract Invoked when the picker is closed.
 * @discussion The picker will be dismissed automatically after a contact or property is picked.
 */
optional public func contactPickerDidCancel(picker: CNContactPickerViewController)

如果我选择一个有号码的联系人，就会调用该号码。然而，从方法文档看来，无论如何都应该调用它。

我的问题是，如果用户选择没有号码的联系人，我需要提供一个UIAlertController。但是，只有在 CNContactPickerViewController 被解除后我才能执行此操作。

通过在 viewDidAppear 中使用一些逻辑，我可能会变得非常黑客，但似乎应该有一种更干净的方法。

剩下的唯一委托(delegate)方法是:

/*!
 * @abstract Singular delegate methods.
 * @discussion These delegate methods will be invoked when the user selects a single contact or property.
 */
optional public func contactPicker(picker: CNContactPickerViewController, didSelectContact contact: CNContact)
optional public func contactPicker(picker: CNContactPickerViewController, didSelectContactProperty contactProperty: CNContactProperty)

/*!
 * @abstract Plural delegate methods.
 * @discussion These delegate methods will be invoked when the user is done selecting multiple contacts or properties.
 * Implementing one of these methods will configure the picker for multi-selection.
 */
optional public func contactPicker(picker: CNContactPickerViewController, didSelectContacts contacts: [CNContact])
optional public func contactPicker(picker: CNContactPickerViewController, didSelectContactProperties contactProperties: [CNContactProperty])

这无助于确定 CNContactPickerViewController 何时实际离开屏幕。

(Xcode8/swift2.3/iOS10)

Answer 1

您可以弹出这样的警报。您还可以添加一个“重试”按钮并重新启动选择器。

    func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {
        let name = CNContactFormatter.string(from: contact, style: .fullName)
        let phones = contact.phoneNumbers
        if phones.count == 0 {
            let alertController = UIAlertController(title: "Error", message: "\(name) has no phone numbers", preferredStyle: .alert)
            alertController.addAction(UIAlertAction(title: "Ok", style: .default) { (action) in })
            picker.dismiss(animated: false){
                self.present(alertController, animated: true) {}
            }
        }
        //Do stuff here
    }