我現在用到的橫豎屏比較簡單，等以后遇到復雜的再來更新吧

最簡單的橫豎屏

1、勾選可旋轉方向

根據需求，自己勾選旋轉方向

此時，便可以隨便旋轉了，只是我們還需要更新布局
2、在我們需要更新布局的view中，重寫方法

 // 更新界面布局
override func layoutSubviews() {
    [super layoutSubviews];
     //通過狀態欄電池圖標判斷橫豎屏
    if ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationMaskPortrait) {
        //豎屏布局
    } else {
        //橫屏布局
    }
}

3、控制器中如果要更新布局，需調用方法

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
        // 屏幕旋轉調用
        if (size.width > size.height) {
            //橫屏設置
        }else{
            //豎屏設置
        }
    }

這里，最簡單的橫豎屏設置完成

基礎知識

三種枚舉：UIDeviceOrientation、UIInterfaceOrientation、UIInterfaceOrientationMask

1、設備方向：UIDeviceOrientation

UIDeviceOrientation是指設備iPhone或者iPad本身旋轉的方向，設備方向包括7中，其中有一種是未知方向，旋轉方向是根據home鍵來判斷的，源碼如下

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
    UIDeviceOrientationUnknown,
    UIDeviceOrientationPortrait,            // Device oriented vertically, home button on the bottom
    UIDeviceOrientationPortraitUpsideDown,  // Device oriented vertically, home button on the top
    UIDeviceOrientationLandscapeLeft,       // Device oriented horizontally, home button on the right
    UIDeviceOrientationLandscapeRight,      // Device oriented horizontally, home button on the left
    UIDeviceOrientationFaceUp,              // Device oriented flat, face up
    UIDeviceOrientationFaceDown             // Device oriented flat, face down
} __TVOS_PROHIBITED;

監聽當前設備旋轉的方法：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onDeviceOrientationDidChange)
                     name:UIDeviceOrientationDidChangeNotification
                                               object:nil];

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

 - (BOOL)onDeviceOrientationDidChange{
    //獲取當前設備Device
    UIDevice *device = [UIDevice currentDevice] ;
    //識別當前設備的旋轉方向
    switch (device.orientation) {
        case UIDeviceOrientationFaceUp:
            NSLog(@"屏幕向上平躺");
            break;

        case UIDeviceOrientationFaceDown:
            NSLog(@"屏幕向下平躺");
            break;

        case UIDeviceOrientationUnknown:
            //系統當前無法識別設備朝向，可能是傾斜
            NSLog(@"未知方向");
            break;

        case UIDeviceOrientationLandscapeLeft:
            NSLog(@"屏幕向左橫置");
            break;

        case UIDeviceOrientationLandscapeRight:
            NSLog(@"屏幕向右橫置");
            break;

        case UIDeviceOrientationPortrait:
            NSLog(@"屏幕直立");
            break;

        case UIDeviceOrientationPortraitUpsideDown:
            NSLog(@"屏幕直立，上下顛倒");
            break;

        default:
            NSLog(@"無法識別");
            break;
    }
    return YES;
}

注意：設備方向智能獲取，不能更改

2、界面方向：UIInterfaceOrientation

界面方向可以自己設置

typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {
    UIInterfaceOrientationUnknown            = UIDeviceOrientationUnknown,
    UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,
    UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,
    UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft
} __TVOS_PROHIBITED;

3、界面方向：UIInterfaceOrientationMask

typedef NS_OPTIONS(NSUInteger, UIInterfaceOrientationMask) {
    UIInterfaceOrientationMaskPortrait = (1 << UIInterfaceOrientationPortrait),
    UIInterfaceOrientationMaskLandscapeLeft = (1 << UIInterfaceOrientationLandscapeLeft),
    UIInterfaceOrientationMaskLandscapeRight = (1 << UIInterfaceOrientationLandscapeRight),
    UIInterfaceOrientationMaskPortraitUpsideDown = (1 << UIInterfaceOrientationPortraitUpsideDown),
    UIInterfaceOrientationMaskLandscape = (UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
    UIInterfaceOrientationMaskAll = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskPortraitUpsideDown),
    UIInterfaceOrientationMaskAllButUpsideDown = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
} __TVOS_PROHIBITED;

我覺得，這個就是多了兩種枚舉，讓我們在使用的時候更方便一些，別的，我也沒看出來啥???♀?
當我們在某一個界面，需要單獨設置旋轉方向的時候，就使用以下方法

override var shouldAutorotate: Bool {
        // 支持界面自動旋轉，返回true，否則返回false
        return true
    }

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        // 支持的旋轉方向
       return UIInterfaceOrientationMask.all
    }

override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
        // 進入界面設置默認顯示方向
       return UIInterfaceOrientation.portrait
    }