swift 整个项目竖屏，某个页面横屏

1、AppDelegate

（1）定义变量 var blockRotation: Bool = false

（2）定义方法

 func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> UIInterfaceOrientationMask {     
        if self.blockRotation{
            return UIInterfaceOrientationMask.All
        } else {
            return UIInterfaceOrientationMask.Portrait
        }
        
        
 }

   2、要横屏的viewController

（1）获取变量

  let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate

（2）在viewDidLoad中修改blockRotation变量值

 override func viewDidLoad() {
        super.viewDidLoad()
        appDelegate.blockRotation = true
       
    }

（3）viewWillAppear 设置页面横屏

 override func viewWillAppear(animated: Bool) {
        let value = UIInterfaceOrientation.LandscapeLeft.rawValue
        UIDevice.currentDevice().setValue(value, forKey: "orientation")
 }

（4）viewWillDisappear设置页面转回竖屏

 override func viewWillDisappear(animated: Bool) {
        appDelegate.blockRotation = false
        let value = UIInterfaceOrientation.Portrait.rawValue
        UIDevice.currentDevice().setValue(value, forKey: "orientation")
 }

（5）横屏页面是否支持旋转

 override func shouldAutorotate() -> Bool {
        return false
 }