如何订阅PKPassLibraryNotificationName

Question

我需要观察https://developer.apple.com/documentation/passkit/pkpasslibrarynotificationname中指定的.PKPassLibraryDidChange和.PKPassLibraryRemotePaymentPassesDidChange通知，>

但是它们不是NSNotification.Name的子类，所以

let observer = NotificationCenter.default.addObserver(forName: PKPassLibraryNotificationName.PKPassLibraryDidChange, object: nil, queue: nil) { notification in  
     ...  
} 
不编译。

是否需要进行其他导入才能在NotificationCenter上观察PKPassLibraryNotificationName？

[我需要观察https：//developer.apple.com/documentation/passkit / ...中指定的.PKPassLibraryDidChange和.PKPassLibraryRemotePaymentPassesDidChange通知]

Answer 1

要回答您的实际问题，Notification.Name只是一个字符串。您可以这样创建通知名称：

    let notification = NSNotification.Name(rawValue: PKPassLibraryNotificationName.PKPassLibraryDidChange.rawValue)
    NotificationCenter.default.addObserver(forName: notification, object: myPassLibrary, queue: nil) { (notification) in
        // do something here
    }