WWDC 2014 Advanced Cloudkit Video建议:每次收到推送时,都应检查通知集合以查找可能错过的任何内容。
我也这样做,但是如果在很短的时间内在同一条记录上发生2次更新,我将收到2个推送通知,每个通知将使用网络两次,因此notificationChangedBlock
将被称为2x2 = 4次,但相关的只有2(或0(如果未丢失任何通知)。
这效率不高,您会做些什么?
func application(application: UIApplication!, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]!) {
Utility.checkNotifications()
}
class func checkNotifications() {
let defaultContainer = CKContainer.defaultContainer()
let publicDatabase = defaultContainer.publicCloudDatabase
let fnco = CKFetchNotificationChangesOperation(previousServerChangeToken: previousChangeToken)
fnco.notificationChangedBlock = {notification in
readNotificationIDs.append(notification.notificationID)
if previousChangeToken != nil {
Utility.processNotification(notification)
}
}
fnco.fetchNotificationChangesCompletionBlock = {serverChangeToken, error in
previousChangeToken = serverChangeToken
let op = CKMarkNotificationsReadOperation(notificationIDsToMarkRead: readNotificationIDs)
op.start()
}
defaultContainer.addOperation(fnco)
}
最佳答案
我用这个老把戏:
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(fetchPendingNotifications) object:nil];
[self performSelector:@selector(fetchPendingNotifications) withObject:nil afterDelay:2.0f];
关于ios - 如何通过CKFetchNotificationChangesOperation避免无效的网络数据使用?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/26276728/