EventKit权限

Question

我希望我的EventKit在尝试将事件添加到拒绝访问的日历时请求对日历的权限。它只是在第一次使用应用程序时询问，如果您在设置中拒绝访问，它将不会提示用户再次授予访问权限。请帮帮忙。

额外的学分:我也希望它检查事件是否已经存在于日历中，如果存在，编辑它。任何人在这方面的帮助都将不胜感激！

下面是我的代码：

func addToCalendar(){
    let eventStore = EKEventStore()

    let startDate = NSDate()
    let endDate = startDate.dateByAddingTimeInterval(60 * 60) // One hour

    if (EKEventStore.authorizationStatusForEntityType(.Event) != EKAuthorizationStatus.Authorized) {
        eventStore.requestAccessToEntityType(.Event, completion: {
            granted, error in
            self.createEvent(eventStore, title: "\(self.meal.text!)", startDate: startDate, endDate: endDate)
        })
    } else {
        createEvent(eventStore, title: "\(self.meal.text!)", startDate: startDate, endDate: endDate)
    }
}

func createEvent(eventStore: EKEventStore, title: String, startDate: NSDate, endDate: NSDate) {
    let event = EKEvent(eventStore: eventStore)

    event.title = title
    event.startDate = startDate
    event.endDate = endDate
    event.calendar = eventStore.defaultCalendarForNewEvents
    event.notes = "\(self.Recipe.text!) - See Meal Planning on Listacular"

    do {
        try eventStore.saveEvent(event, span: .ThisEvent)
        savedEventId = event.eventIdentifier
    } catch {

        print("Denied")
    }
}

Answer 1

您不能直接提示用户再次授予访问权限。但您可以向用户显示有关权限状态的弹出窗口，也可以从设备设置请求启用权限。以下是objective-c中的一个示例

    EKEventStore *store = [EKEventStore new];
[store requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
    if (!granted)
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            UIAlertController* alertController=[UIAlertController alertControllerWithTitle:@"Access to Calendar is Restricted" message:@"To re-enable, please go to Settings and turn on Calendar Settings for this app else Continue to create party without saving it to your Calendar" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *actionOK = [UIAlertAction actionWithTitle:@"Continue" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action)
                                       { 
                                          [self addEvent:store]; //your method
                                       }];
            [alertController addAction:actionOK];
            [alertController addAction:[UIAlertAction actionWithTitle:kSETTINGS style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action)
                                        {
                                            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
                                        }]];
            [self presentViewController:alertController animated:NO completion:nil];
        });
    }
    else
    {
        [self addEvent:store]; // your method
    }
}];

您可以使用EKEventStore的此方法检查存储中的特定事件。您需要传递事件标识符。

- (nullable EKEvent *)eventWithIdentifier:(NSString *)identifier;