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【已解决】iOS的app的屏幕在横屏进入后台再从后台恢复时却变为竖屏

app crifan 17浏览 0评论

ios程序中发现个问题:

对于已知的屏幕方向的定义:

public enum UIInterfaceOrientation : Int {

    case unknown

    case portrait

    case portraitUpsideDown

    case landscapeLeft

    case landscapeRight

}

public enum UIDeviceOrientation : Int {

    case unknown

    case portrait // Device oriented vertically, home button on the bottom

    case portraitUpsideDown // Device oriented vertically, home button on the top

    case landscapeLeft // Device oriented horizontally, home button on the right

    case landscapeRight // Device oriented horizontally, home button on the left

    case faceUp // Device oriented flat, face up

    case faceDown // Device oriented flat, face down

}

在设备屏幕从:竖屏,变成 横屏

点击Home 键进入后台

再点击app图标回到 前台

后,设备的方向,却从之前的横屏,变成了竖屏:

代码:

    func applicationWillResignActive(_ application: UIApplication) {        

        print(“applicationWillResignActive UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

    func applicationDidEnterBackground(_ application: UIApplication) {        

        print(“applicationDidEnterBackground UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

    func applicationWillEnterForeground(_ application: UIApplication) {

        print(“applicationWillEnterForeground UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

    func applicationDidBecomeActive(_ application: UIApplication) {

        print(“applicationDidBecomeActive UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

    func applicationWillTerminate(_ application: UIApplication) {

        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

    }

    

    func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {

        print(“supportedInterfaceOrientationsFor UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

    

log输出:

applicationWillResignActive UIDevice.current.orientation.rawValue=4

applicationDidEnterBackground UIDevice.current.orientation.rawValue=4

applicationWillEnterForeground UIDevice.current.orientation.rawValue=1

applicationDidBecomeActive UIDevice.current.orientation.rawValue=1

进入后台前是:rawValue=4=landscapeRight

恢复后回到前台却变成了:rawValue=1=portrait

导致:

后续的虽然调用了:

extension UIDevice {

    static func rotateTo(newDirection:UIInterfaceOrientation) {

        self.current.setValue(newDirection.rawValue, forKey: “orientation”)

    }

    static func rotateToIfNeed(newDirection:UIInterfaceOrientation) {

        if !self.isOrientation(toCmpOrientation: newDirection) {

            self.rotateTo(newDirection: newDirection)

        }

    }

    static func isOrientation(toCmpOrientation:UIInterfaceOrientation) -> Bool {

        //Note:

        // self.current.orientation is UIDeviceOrientation

        // toCmpOrientation is UIInterfaceOrientation

        // but first 5 type: unknown/portrait/portraitUpsideDown/landscapeLeft/landscapeRight

        // of enum value is equal

        return self.current.orientation.rawValue == toCmpOrientation.rawValue

    }

}

中的:

rotateTo结果却不起效果。

ios back from background UIDevice orientation change to portrait

ios back from background UIDevice orientation changed

ios return from background UIDevice orientation changed

ios8 – How to change device orientation when app returns to foreground in iOS – Stack Overflow

objective c – How to check the orientation of device programmatically in iPhone? – Stack Overflow

ios – How to detect orientation change? – Stack Overflow

uideviceorientation – How to detect iOS device orientation from background? – Stack Overflow

How to change device orientation when app returns to foreground from background in iOS? – Stack Overflow

screen – How to change device orientation when app returns to foreground in iOS? – Stack Overflow

结果用代码:

    func applicationDidEnterBackground(_ application: UIApplication) {

        self.devOrientationBeforeIntoBkg = UIDevice.current.orientation@UIApplicationMain

class AppDelegate: UIResponder, UIApplicationDelegate,UINavigationControllerDelegate,JPUSHRegisterDelegate{

    let curVersion = AppVersion()

    

    var disableRotation: Bool = false

    

    var devOrientationBeforeIntoBkg = UIDeviceOrientation.unknown

}

        print(“applicationDidEnterBackground UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

    func applicationWillEnterForeground(_ application: UIApplication) {

        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.

        

        print(“applicationWillEnterForeground UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

        

        let prevOrientation:UIInterfaceOrientation = UIInterfaceOrientation(rawValue: self.devOrientationBeforeIntoBkg.rawValue)!

        UIDevice.rotateToIfNeed(newDirection: prevOrientation)

        print(“applicationWillEnterForeground after rotated: UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

强制在applicationWillEnterForeground时,从rawValue=1转换为rawValue=4

但是结果applicationDidBecomeActive时,却还是rawValue=1

applicationWillResignActive UIDevice.current.orientation.rawValue=4

applicationDidEnterBackground UIDevice.current.orientation.rawValue=4

applicationWillEnterForeground UIDevice.current.orientation.rawValue=1

applicationWillEnterForeground after rotated: UIDevice.current.orientation.rawValue=4

applicationDidBecomeActive UIDevice.current.orientation.rawValue=1

后来把同样的转换代码放到applicationDidBecomeActive:

    func applicationDidBecomeActive(_ application: UIApplication) {        

        print(“applicationDidBecomeActive UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

        

        let prevOrientation:UIInterfaceOrientation = UIInterfaceOrientation(rawValue: self.devOrientationBeforeIntoBkg.rawValue)!

        UIDevice.rotateToIfNeed(newDirection: prevOrientation)

        print(“applicationDidBecomeActive after rotateToIfNeed: UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

就可以了:

applicationWillResignActive UIDevice.current.orientation.rawValue=4

applicationDidEnterBackground UIDevice.current.orientation.rawValue=4

applicationWillEnterForeground UIDevice.current.orientation.rawValue=1

applicationWillEnterForeground after rotated: UIDevice.current.orientation.rawValue=4

applicationDidBecomeActive UIDevice.current.orientation.rawValue=1

supportedInterfaceOrientationsFor UIDevice.current.orientation.rawValue=4

applicationDidBecomeActive after rotateToIfNeed: UIDevice.current.orientation.rawValue=4

【总结】

所以核心的逻辑是:

在(从后台恢复到前台active的)applicationDidBecomeActive时,去执行:UIDevice的rotate:

    func applicationDidBecomeActive(_ application: UIApplication) {

        print(“applicationDidBecomeActive UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

        

        if (self.devOrientationBeforeIntoBkg != UIDeviceOrientation.unknown) {

            let prevOrientation:UIInterfaceOrientation = UIInterfaceOrientation(rawValue: self.devOrientationBeforeIntoBkg.rawValue)!

            UIDevice.rotateToIfNeed(newDirection: prevOrientation)

        }

        print(“applicationDidBecomeActive after rotateToIfNeed: UIDevice.current.orientation.rawValue=\(UIDevice.current.orientation.rawValue)”)

    }

才可以把,现在不正常的设备方向:

UIDevice.current.orientation.rawValue=1=portrait

转换为正常的,进入后台前的

UIDevice.current.orientation.rawValue=4=landscapeRight

-》从而使得后续的页面旋转正常工作。

最后的代码是:

@UIApplicationMain

class AppDelegate: UIResponder, UIApplicationDelegate,UINavigationControllerDelegate,JPUSHRegisterDelegate{

    let curVersion = AppVersion()

    

    var disableRotation: Bool = false

    

    var devOrientationBeforeIntoBkg = UIDeviceOrientation.unknown

}

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        self.devOrientationBeforeIntoBkg = UIDevice.current.orientation

        return true

    }

    func applicationDidEnterBackground(_ application: UIApplication) {

        self.devOrientationBeforeIntoBkg = UIDevice.current.orientation

    }

    func applicationDidBecomeActive(_ application: UIApplication) {

        if (self.devOrientationBeforeIntoBkg != UIDeviceOrientation.unknown) {

            let prevOrientation:UIInterfaceOrientation = UIInterfaceOrientation(rawValue: self.devOrientationBeforeIntoBkg.rawValue)!

            UIDevice.rotateToIfNeed(newDirection: prevOrientation)

        }

    }

    func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {

        if self.disableRotation {

            return DeviceDirectionMaskReportDetail

        } else {

            return DeviceDirectionMaskAppDefault

        }

    }

期间调试时输出是:

didFinishLaunchingWithOptions UIDevice.current.orientation.rawValue=0

applicationDidBecomeActive UIDevice.current.orientation.rawValue=1

applicationDidBecomeActive after rotateToIfNeed: UIDevice.current.orientation.rawValue=1

applicationWillResignActive UIDevice.current.orientation.rawValue=4

applicationDidEnterBackground UIDevice.current.orientation.rawValue=4

applicationWillEnterForeground UIDevice.current.orientation.rawValue=1

supportedInterfaceOrientationsFor UIDevice.current.orientation.rawValue=4

supportedInterfaceOrientationsFor UIDevice.current.orientation.rawValue=4

applicationDidBecomeActive after rotateToIfNeed: UIDevice.current.orientation.rawValue=4

转载请注明:在路上 » 【已解决】iOS的app的屏幕在横屏进入后台再从后台恢复时却变为竖屏

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