ios - 如何检测 PKAddPassesViewController 中的添加按钮按下

Question

我正在尝试检测用户何时点击 PKAddPassesViewController 中的“添加”按钮。

我添加了 addPassesViewControllerDidFinish()，这样当 passVC 被关闭时，函数 addPassesViewControllerDidFinish() 将被调用。

    override func viewDidLoad() {
         self.pass = try PKPass(data: downloadedData! as Data)
         let passVC = PKAddPassesViewController(pass: self.pass)
         self.present(passVC!, animated: true)
         // when passVC is dimissed by the user,     addPassesViewControllerDidFinish is expected to be called, but it never gets called.

    }

    func addPassesViewControllerDidFinish(_ controller: PKAddPassesViewController) {
        print("enter DidFinish")
        let passLib = PKPassLibrary()

        // Get your pass
        guard let pass = self.pass else { return }

        if passLib.containsPass(pass) {
            print("if start")

            // Show alert message for example
            let alertController = UIAlertController(title: "", message: "Successfully added to Wallet", preferredStyle: .alert)

            alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { _ in
                controller.dismiss(animated: true, completion: nil)
            }))

            controller.show(alertController, sender: nil)
            print("if end")

        } else {
            // Cancel button pressed
            print("else start");
            controller.dismiss(animated: true, completion: nil)
            print("else end");
        }
    }

但是，当用户取消 passVC 时，func addPassesViewControllerDidFinish() 根本不会被调用。

Answer 1

您应该修复三件事:
1. 在您的 ViewController 类中扩展 PKAddPassesViewControllerDelegate。
2. 仔细检查您是否将 delegate 添加到 PKAddPassesViewController:VC?.delegate = self，这会将您的委托(delegate)链接到 PKAddPassesViewControllerDelegate。
3. 在 addPassesViewControllerDidFinish 中，首先关闭 controller。然后在 passLib.containPass 中做任何你想做的事。 alertController 不再属于 controller，可能属于它的父 View 。