我正在尝试允许用户安排通知,以便在每天的特定时间打开应用.到目前为止,我已经能够通过计算从现在到用户选择的时间以及在X秒内安排通知的时间来安排第一个通知.但是,有没有办法让我可以设置每天重复的通知？如果您感到困惑,这是我的代码的一部分:
let newTime: Double = Double(totalDifference)
let notifTrigger = UNTimeIntervalNotificationTrigger(timeInterval: newTime, repeats: false)
let request = UNNotificationRequest(identifier: "openApp", content: notif, trigger: notifTrigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: { error in
if error != nil {
print(error!)
completion(false)
} else {
completion(true)
}
})
任何帮助深表感谢
目前，我正在尝试在我的一个视图控制器上获取歌曲类型的实体。这是相关的代码，我有：
import CoreData
class TimerScreenVC: UIViewController, NSFetchedResultsControllerDelegate {
var songController: NSFetchedResultsController<Song>!
override function viewDidLoad() {
super.viewdidLoad()
attemptSongFetch()
}
func attemptSongFetch() {
let fetchRequest: NSFetchRequest<Song> = Song.fetchRequest()
let controller = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
let sortByTitle = NSSortDescriptor(key: "title", ascending: true)
fetchRequest.sortDescriptors = [sortByTitle]
songController = controller
do {
try songController.performFetch()
} catch {
let error = error as NSError
print("\(error)")
}
}
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
print("called will change")
}
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { …目前,我已经制作了一个名为SongNames的自定义类.这是它的代码:
import Foundation
class songAttributes {
private var _songTitle: String!
private var _songURL: String!
var songTitle: String {
return _songTitle
}
init(songTitle: String, songURL: String) {
_songURL = songURL
_songTitle = songTitle
}
var songURL: String {
return _songURL
}
}
我没有问题为这个类设置值.例如,我可能会写:
var songAttribute = songAttributes(songTitle: "That's What I Like", url: "some url")
但是,如果我尝试更改我刚刚创建的变量的属性,比如说:
songAttribute.songTitle = "Locked Out of Heaven"
我收到消息:"错误:songTitle是一个获得唯一的属性"
话虽如此,有没有办法搞砸我的SongName类,以便可以更改这些属性,而不仅仅是get-only？