iOS开发系列之终结强制旋转屏幕——Swift

最近做项目遇到一个需求，就是大部分页面都是竖屏，只有两个页面是横屏，这就要用到强制旋转屏幕了。我查了网上的资料，人云亦云者众多，但是真正有效的很少，所以干脆我自己总结一个吧，demo见底部，文章里所有代码和设置都是demo里的。

第一步：设置项目属性为只允许竖屏

image.png

需要注意的是，iPad需要在info.plist里设置：

image.png

第二步：AppDelegate里的代码

class AppDelegate: UIResponder, UIApplicationDelegate {
    
    var window: UIWindow?
    
    var isForceLandscape: Bool = false
    var isForcePortrait: Bool = false

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        window = UIWindow.init(frame: UIScreen.main.bounds)
        window?.backgroundColor = UIColor.white
        window?.rootViewController = UINavigationController.init(rootViewController: ViewController.init())
        window?.makeKeyAndVisible()
        
        return true
    }

    func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
        
        if (isForceLandscape) {
            //这里设置允许横屏的类型
            return .landscapeRight;
        }else if (isForcePortrait){
            return .portrait;
        }

        return .portrait;
    }
}

第三步：在控制器里的代码，demo是写在控制器的基类BaseViewController里的

class BaseViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    ///强制横屏
    func forceOrientationLandscape() {
        let appdelegate = UIApplication.shared.delegate as! AppDelegate
        appdelegate.isForceLandscape = true
        appdelegate.isForcePortrait = false
        appdelegate.application(UIApplication.shared, supportedInterfaceOrientationsFor: self.view.window)
        
        //强制翻转屏幕，Home键在右边。
        UIDevice.current.setValue(UIInterfaceOrientation.landscapeRight.rawValue, forKey: "orientation")
        //刷新
        UIViewController.attemptRotationToDeviceOrientation()
        
    }
    
    ///强制竖屏
    func forceOrientationPortrait() {
        let appdelegate = UIApplication.shared.delegate as! AppDelegate
        appdelegate.isForceLandscape = false
        appdelegate.isForcePortrait = true
        appdelegate.application(UIApplication.shared, supportedInterfaceOrientationsFor: self.view.window)
        
        //强制翻转屏幕，Home键在右边。
        UIDevice.current.setValue(UIInterfaceOrientation.portrait.rawValue, forKey: "orientation")
        //刷新
        UIViewController.attemptRotationToDeviceOrientation()
        
    }
    
}

第四步：使用，demo里是TestViewController 使用横屏，ViewController 使用竖屏：

在 TestViewController里使用强制横屏：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    // 强制横屏
    forceOrientationLandscape()
}

在 ViewController里使用强制竖屏：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    // 强制竖屏
    forceOrientationPortrait()
}

搞定收工，demo地址: https://github.com/zmfflying/ZOrientationSwift

资料参考:
https://www.jianshu.com/p/5c773628caa6