Question

我想编写一个方法，该方法带有一个事件对象，该方法具有一个名称和一个日期参数。该函数请求访问/检查对事件存储的访问，使用参数创建EKEvent，将其保存到存储中，然后将Eventidentifier作为String返回。

到目前为止，我遇到了麻烦，因为eventStore.requestAccess（To :)方法闭包转义了，并且在实际创建EKEvent对象并将其保存到存储之前返回了字符串。

我的方法位于EventHelper类的代码中，该类是EventStore和Apples EKEventStore之间的抽象层。

import EventKit

struct Event {
    var name: String
        var date: Date
    var id: String?
}

class EventHelper {

    // MARK: Properties
    var store: EKEventStore!

    // MARK: Methods
    func createCalendarEvent(for event: Event) -> String? {
        // Prepare a place to store the eventIdentifier
        var identifier : String?

        // Get acces to the eventstore
        store.requestAccess(to: .event) { (granted, error) in

            if (granted) && (error == nil) {

                    print("Calendar event creation.")
                    print("granted: \(granted)")
                    print("error: \(String(describing: error))")

                    // Create a new event kit event
                    let newEvent = EKEvent(eventStore: self.store)
                    newEvent.title = event.name
                    newEvent.startDate = event.date

                    // Create a timeinterval for the end date
                    let twoHourTimeInterval = TimeInterval(exactly: 7200)
                    newEvent.endDate = event.date.addingTimeInterval(twoHourTimeInterval!)


                    // choose the calender the event should be assinged to
                    newEvent.calendar = self.store.defaultCalendarForNewEvents

                    // try to save the new event in the event store
                    do {
                        try self.store.save(newEvent, span: .thisEvent, commit: true)
                        identifier = newEvent.eventIdentifier
                        print("Saved event with ID: \(String(describing: newEvent.eventIdentifier))")
                     // The event gets created and the ID is printed to the console but at a time when the whole function already has returned (nil)
                    } catch let error as NSError {
                        print("Failed to save event with error: \(error)")
                    }
            }
            else {
                print("Failed to save event with error \(String(describing: error)) or access not granted")
            }
        }
        print("new Event: \(String(describing: identifier))")
        return identifier
    }
}

Answer 1

我找到了解决方法！

不要使用componentDidMount() { // One signal notification settings OneSignal.configure(); OneSignal.setLogLevel(5, 0); // adb logcat debug (5) logs OneSignal.init('xxxxxxxxxxxx'); OneSignal.inFocusDisplaying(2); OneSignal.addEventListener('ids', this.onIds); OneSignal.getPermissionSubscriptionState((status) => { if(status.userId) // update userID using props }); } onIds = (device) => { const userId = device.userId; if(userId) // update userID using props OneSignal.removeEventListener('ids', this.onIds); }来创建事件。我仅在明确需要访问EKEventStore的情况下使用它。并检查我是否打开react-native-onesignal: 3.2.11 react-native: 0.57.4 react: 16.6.0-alpha.8af6728

代码如下：

.requestAccess(to:completion:)

将EKEvent.identifier保存到EKEventStore后如何立即返回？

1 个答案: