ios - 检查用户是否在 CNContactStore 中有电话号码并显示错误弹出窗口

Question

我正在编写一个程序，允许用户使用 CNContactPickerViewController 选择联系人。如果所选联系人 NOT 没有关联的电话号码，我想让它弹出一个错误，并在他们点击确定时返回到 ContactPickerViewController。我已经检查了带有断点的代码并且它正在正确执行，但是它没有显示错误弹出窗口。

我这辈子都想不通为什么……这是我的代码:

 func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {

    if contact.phoneNumbers.first?.value.stringValue != nil{
        //@TODO: check for repeats in people array

        // do something with contact
        let newPerson = Person(firstName: contact.givenName,
                               lastName: contact.familyName,
                               profileImage: #imageLiteral(resourceName: "capitalizing_on_the_economic_potential_of_foreign_entrepreneurs_feature.png") )

        if contact.imageDataAvailable == true{
            newPerson.profileImage = UIImage(data: contact.imageData!)!
        }

        // this is for the full name
        let fullname = "\(contact.givenName) \(contact.familyName)"
        print("The selected name is: \(fullname)")
        let phoneNum = contact.phoneNumbers.first?.value.stringValue
        print("The selected phone num is: \(phoneNum!)")

        //appends data to new activity model for prep to send back to home vc
        newActivity.people.append(newPerson)
        print("the people in the new activity array are: \(newActivity.people)")

        peopleCollection.reloadData()

    } else {
        print("error has no number")
        let alertController = UIAlertController(title: "Error: Person has no number!", message: "", preferredStyle: .alert)
        let confirmAction = UIAlertAction(title: "Ok", style: .default, handler: {
            alert -> Void in
        })
        //add actions to alert sheet
        alertController.addAction(confirmAction)
        self.present(alertController, animated: true, completion: nil)
        //the code executes here correctly, but it does not present the alertController
    }
    //this is for phone number without dashes
    //print("the selected phone number is: \((contact.phoneNumbers[0].value ).value(forKey: "digits") as! String)")
}

Answer 1

为什么不限制用户只能选择电话号码？您甚至可以隐藏所有其他字段，这样他们要么会看到电话号码，要么在联系人没有电话号码的情况下什么也看不到(这会导致他们转到其他联系人...)在这里查看答案，它还提到仅过滤电话号码: Contact Address book crash on iOS 10 beta在这种情况下，只有在选择电话号码时才会调用 didSelect 函数。