在 IOS Swift 中检测屏幕解锁事件

Question

如何检测 iPhone 上的屏幕解锁事件？当用户解锁它时，我想在我的应用程序中执行一个操作。我在谷歌上搜索但只找到与目标 C 相关的代码，将其更改为 swift 但它不起作用。
关注这个博客： http://kidtechblogs.blogspot.com/2014/07/how-to-detect-screen-lockunlock-events.html.
任何帮助我如何快速检测到它。 下面是改成swift的代码..

func displayStatusChanged(center: CFNotificationCenter, observer: Void, name: CFString, object: Void, userInfo: CFDictionaryRef) {
        // the "com.apple.springboard.lockcomplete" notification will always come after the "com.apple.springboard.lockstate" notification
        let lockState = (name as String)
        print("Darwin notification NAME = \(name)")
        if (lockState == "com.apple.springboard.lockcomplete") {
            print("DEVICE LOCKED")
        }
        else {
            print("LOCK STATUS CHANGED")
        }
    }

func registerforDeviceLockNotification() {
        //Screen lock notifications
        CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),     //center
                nil,     // observer
                displayStatusChanged,     // callback
                CFSTR("com.apple.springboard.lockcomplete"),     // event name
                nil,     // object
                .deliverImmediately)
        CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),     //center
                nil,     // observer
                displayStatusChanged,     // callback
                CFSTR("com.apple.springboard.lockstate"),     // event name
                nil,     // object
                .deliverImmediately)
    }

Answer 1

我刚刚更新了代码

只需将 registerforDeviceLockNotification() 函数调用到应用委托 didfinishLunch 函数（AppDelegate.swift）中

如果您正在使用会话，则将 registerforDeviceLockNotification() 函数调用到 willConnectTo (SceneDelegate.swift)

示例代码（AppDelegate.swift）

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        registerforDeviceLockNotification()
        return true
    }
    
    func registerforDeviceLockNotification() {
        //Screen lock notifications
        CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),     //center
            Unmanaged.passUnretained(self).toOpaque(),     // observer
            displayStatusChangedCallback,     // callback
            "com.apple.springboard.lockcomplete" as CFString,     // event name
            nil,     // object
            .deliverImmediately)

    }
    
    private let displayStatusChangedCallback: CFNotificationCallback = { _, cfObserver, cfName, _, _ in
        guard let lockState = cfName?.rawValue as String? else {return}

        if (lockState == "com.apple.springboard.lockcomplete") {
               print("DEVICE LOCKED")
           } else {
               print("LOCK STATUS CHANGED")
           }

       
    }

示例代码（SceneDelegate.swift）

func registerforDeviceLockNotification() {
    //Screen lock notifications
    CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),     //center
        Unmanaged.passUnretained(self).toOpaque(),     // observer
        displayStatusChangedCallback,     // callback
        "com.apple.springboard.lockcomplete" as CFString,     // event name
        nil,     // object
        .deliverImmediately)

}

private let displayStatusChangedCallback: CFNotificationCallback = { _, cfObserver, cfName, _, _ in
    guard let lockState = cfName?.rawValue as String? else {return}

    if (lockState == "com.apple.springboard.lockcomplete") {
           print("DEVICE LOCKED")
       } else {
           print("LOCK STATUS CHANGED")
       }

   
}




 

Answer 2

您的代码示例中有一些错误：

• 在 swift 中使用 CFString 是通过一个简单的转换完成的：myString as CFString，不再是 CFSTR()...
• 获取通知回调的最简单方法是使用Unmanaged.passUnretained(self).toOpaque() 添加观察者。这将使您有可能在课堂上捕获回调

最后，swift 版本与 Objective-c 版本完全不同，这里是 Swift 3 中的完整代码：

func registerforDeviceLockNotification() {
    //Screen lock notifications
    CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),     //center
        Unmanaged.passUnretained(self).toOpaque(),     // observer
        displayStatusChangedCallback,     // callback
        "com.apple.springboard.lockcomplete" as CFString,     // event name
        nil,     // object
        .deliverImmediately)
    CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),     //center
        Unmanaged.passUnretained(self).toOpaque(),     // observer
        displayStatusChangedCallback,     // callback
        "com.apple.springboard.lockstate" as CFString,    // event name
        nil,     // object
        .deliverImmediately)
}

private let displayStatusChangedCallback: CFNotificationCallback = { _, cfObserver, cfName, _, _ in
    guard let lockState = cfName?.rawValue as? String else {
        return
    }

    let catcher = Unmanaged<MyClassObserving>.fromOpaque(UnsafeRawPointer(OpaquePointer(cfObserver)!)).takeUnretainedValue()
    catcher.displayStatusChanged(lockState)
}

private func displayStatusChanged(_ lockState: String) {
    // the "com.apple.springboard.lockcomplete" notification will always come after the "com.apple.springboard.lockstate" notification
    print("Darwin notification NAME = \(lockState)")
    if (lockState == "com.apple.springboard.lockcomplete") {
        print("DEVICE LOCKED")
    } else {
        print("LOCK STATUS CHANGED")
    }
}

为了以防万一，别忘了移除你的观察者：

CFNotificationCenterRemoveObserver(CFNotificationCenterGetLocalCenter(),
                                   Unmanaged.passUnretained(self).toOpaque(),
                                   nil,
                                   nil)

Answer 3

据我们所知，您无法使用本机代码检测屏幕锁定解锁状态。通过使用私有 api 将有机会检测屏幕锁定解锁状态。如果您使用的是苹果的私有 api，您的应用可能会被拒绝。我们建议不要使用苹果私有 api。

如果您想在越狱设备中进行屏幕锁定解锁事件，您可以从下面的链接中找到答案

Getting state for system wide notifications in iOS and OS X

Lock Unlock events iphone

Detect screen on/off from iOS service