@property(nonatomic,assign)BOOL allowRotation;//是否允许转向

#pragma mark 支持窗口翻转

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window

{

    if (_allowRotation == YES) {

        return UIInterfaceOrientationMaskLandscapeRight;

    }else{

        return (UIInterfaceOrientationMaskPortrait);

    }

}

- (void)setNewOrientation:(BOOL)fullscreen

{

    if (fullscreen) {

        NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];

        [[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];

        NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];

        [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];

    }else{

        NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];

        [[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];

        NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];

        [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];

    }

}

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

    appDelegate.allowRotation = YES;//(以上2行代码,可以理解为打开横屏开关)

    [self setNewOrientation:YES];//调用转屏代码

    [self creatWebView];

}

-(void)creatWebView

{

    UIWebView *webV = [[UIWebView alloc]initWithFrame:self.view.frame];

    [webV loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.badiu.com"]]];

    [self.view addSubview:webV];

}