在IOS Swift中检测屏幕解锁事件

问题描述

如何在iPhone上检测屏幕解锁事件？当用户解锁时，我想在我的应用中执行操作。我搜索谷歌搜索但只找到与目标C相关的代码，将其更改为快速但不起作用。

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任何帮助如何在swift中检测到它。
下面是代码更改为swift ..

How can i detect screen unlock events on iPhone? When the user unlocks it, I want to perform an action in my app. I searched on googled but only found code related to objective C , change it to swift but its not working.
Follow this blog:http://kidtechblogs.blogspot.com/2014/07/how-to-detect-screen-lockunlock-events.html.
Any help how can i detect it in swift.Below is the code change into swift..

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)
    }

推荐答案

代码示例中有一些错误：

There a few errors in your code sample:

• 在swift中使用 CFString 是通过一个简单的演员来完成的： myString as CFString ，不再 CFSTR（） ...


• 最简单的方法获取通知回调是使用 Unmanaged.passUnretained（self）.toOpaque（）添加观察者。这将使你有可能在你的班级中捕捉回调

• Using CFString in swift is done by a simple cast: myString as CFString, no more CFSTR()...
• The easiest way to get the notification callback is to have add an observer using Unmanaged.passUnretained(self).toOpaque(). That will give you the possibility to catch the callback in your class

最后，swift版本与目标完全不同 - c one，这里是Swift 3中的完整代码：

In the end, the swift version is quite different from the objective-c one, here the full code in Swift 3:

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")
    }
}

以防万一，不要忘记删除你的观察者：

and just in case, don't forget to remove your observer:

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

这篇关于在IOS Swift中检测屏幕解锁事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！