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iOS旋转屏幕

iOS屏幕旋转控制,视频全屏,锁定屏幕

1. 设置App支持的旋转方向(2种方式)

1. 通过工程设置

General->Deployment Info->Device Orientation,勾选支持的方向

2. 通过代码设置(AppDelegate)

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

方式1存在一个问题:如果勾选了多个方向,如果横屏进入App,会出现首页横屏的情况,即使设置了VC只支持竖屏,推荐使用方式2

2. ViewController旋转控制

通常在需要旋转的ViewController,重写下面三个方法即可

/// 控制是否支持自动旋转,回根据设备方向自动调整布局,例如视频横屏播放,微信公众号文章横屏阅读等
override var shouldAutorotate: Bool {
return true
}

/// 设置首次进入ViewController时的方向,之后再根据设备方向变动调整,例如可以保证无论设备是否横屏,首次进入一个ViewController的时候为竖屏
/// 注意:这里的设置仅对第二个页面有效,第一个页面无效
override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
return .portrait
}

/// 设置支持旋转的方向
override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
return .landscape
}

3. 容器

如果ViewController在容器控制器里面的话(UINavigationControllerUITabBarController)需要重写容器,让其指向子控制器

TabBarController

import UIKit

class TabBarController: UITabBarController {
override var shouldAutorotate: Bool {
return self.selectedViewController?.shouldAutorotate ?? false
}

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
return self.selectedViewController?.supportedInterfaceOrientations ?? UIInterfaceOrientationMask.portrait
}

override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
return self.selectedViewController?.preferredInterfaceOrientationForPresentation ?? .portrait
}
}

NavigationController

import UIKit

class NavigationController: UINavigationController {
override var shouldAutorotate: Bool {
return self.topViewController?.shouldAutorotate ?? false
}

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
return self.topViewController?.supportedInterfaceOrientations ?? UIInterfaceOrientationMask.portrait
}

override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
return self.topViewController?.preferredInterfaceOrientationForPresentation ?? .portrait
}
}

4. 强制旋转

iOS没有提供公开的API直接修改屏幕方向,通常我们用kvc的方式实现

// 强制竖屏
UIDevice.current.setValue(UIInterfaceOrientation.portrait.rawValue, forKey: "orientation")

// 强制左横屏
UIDevice.current.setValue(UIInterfaceOrientation.landscapeLeft.rawValue, forKey: "orientation")

5. 方向锁定

通过控制VC支持supportedInterfaceOrientations的方向,就可以控制锁定了,只返回一种方向,就能实现锁定的功能

/// 定义锁定的方向
private var lookOrientation: UIInterfaceOrientation?

// 设置当前的方向(锁定屏幕方向)
self.lookOrientation = UIApplication.shared.statusBarOrientation
// 取消当前的方向(解锁)
self.lookOrientation = nil

/// 重载用于控制锁定
override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
if let orientation = self.lookOrientation {
// 锁定方向
return orientation.orientationMask
} else {
// 默认可选旋转
return .allButUpsideDown
}
}

extension UIInterfaceOrientation {
// UIInterfaceOrientation转换为UIInterfaceOrientationMask
var orientationMask: UIInterfaceOrientationMask {
switch self {
case .unknown:
return .allButUpsideDown
case .portrait:
return .portrait
case .portraitUpsideDown:
return .portraitUpsideDown
case .landscapeLeft:
return .landscapeLeft
case .landscapeRight:
return .landscapeRight
@unknown default:
return .allButUpsideDown
}
}
}