我创建了一个简单的 Today 扩展(小部件),需要支持 iOS 12 及更高版本。它是一个简单的开始停止计时器,需要与应用程序同步。因此,当我切换到应用程序并在那里启动/停止计时器时,它将在小部件中启动计时器,反之亦然。
这工作正常,唯一的问题是当我从小部件导航到应用程序时,当应用程序最小化时,小部件屏幕已经显示在后台并且它不会更新,因为它没有调用任何小部件加载方法。>
我尝试设置来自应用程序的通知,但这也不起作用。任何帮助表示赞赏。
下面是我的定时器类
public struct TimeData: Codable {
public var currentSeconds = 0
public var timerRunningStatus = false
public var loggedTime = Date()
}
class TimerHandler {
public static func loadSharedData() -> TimeData {
// In case this is the first time the app has been run, create some initial data.
if FileManager.default.fileExists(atPath: sharedDataFileURL.path) == false {
saveSharedData(data: TimeData())
}
let decoder = PropertyListDecoder()
do {
let data = try Data(contentsOf: sharedDataFileURL)
return try decoder.decode(TimeData.self, from: data)
} catch {
fatalError(error.localizedDescription)
}
}
public static func saveSharedData(data: TimeData) {
let encoder = PropertyListEncoder()
encoder.outputFormat = .xml
do {
let data = try encoder.encode(data)
try data.write(to: sharedDataFileURL)
} catch {
fatalError(error.localizedDescription)
}
}
static var sharedDataFileURL: URL {
let appGroupIdentifier = "group.com.example.apple-samplecode.TimeData"
guard let url = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroupIdentifier)
else { preconditionFailure("Expected a valid app group container") }
return url.appendingPathComponent("Data.plist")
}
}
现在在我的 TodayViewController.swift 中,我只是获取共享数据并更新标签,如下所示
override func viewDidLoad() {
super.viewDidLoad()
var timerData = TimerHandler.loadSharedData()
updateTimerLabel() //Performs calculation and loads updates label
}
这适用于正常情况,即当您手动移开小部件并获取应用程序并返回小部件时,视图会加载,但如果您从小部件打开应用程序,例如:从小部件导航栏上的应用程序徽标,应用程序计时器将运行并更新,如果我最小化应用程序,小部件已经加载。在这种情况下如何更新小部件?
我通过下面的通知尝试过,但它没有触发
override func viewDidLoad() {
NotificationCenter.default.removeObserver(self)
NotificationCenter.default.addObserver(self, selector: #selector(updatedTimer(_:)), name: .widgetUpdated, object: nil)
super.viewDidLoad()
var timerData = TimerHandler.loadSharedData()
updateTimerLabel() //Performs calculation and loads updates label
}
@objc func updatedTimer(_ notification: Notification) {
print("Notified from app") //This doesnt gets called
}
extension Notification.Name {
static let widgetUpdated = Notification.Name("widgetUpdated")
}
来自主应用
@objc func moveBackground() {
saveTimerStatus()
notificationCenter.post(name: .widgetUpdated, object: nil) //This gets called on app minimize
}
感谢任何帮助