使用两个单独的ViewController 来实现横竖屏的翻转

本文链接：https://blog.youkuaiyun.com/a3100062/article/details/40540411

本文介绍了一种通过两个ViewController分别管理竖屏和横屏布局的方法，利用UIDeviceOrientationDidChangeNotification通知来切换视图控制器，实现优雅的屏幕方向管理。

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实现两个view controller对象,一个做竖屏显示布局，另一个做横屏显示布局。按照本文前面所述方法设置每个view controller只支持特定的一种界面方向，以防止在设备旋转时，view controller内部自行做旋转操作。

主view controller(通常为竖屏的那个)注册

接收UIDeviceOrientationDidChangeNotification通知，在通知的处理方法中，根据当前的设备方向presen或dismiss另一个view controller。

参考代码如下:

@implementation PortraitViewController
{
    BOOL isShowingLandscapeView;
    LandscapeViewController *landscapeViewController;
}
- (id)init
{
    self = [super init];
    if (self) {
        landscapeViewController = [[LandscapeViewController alloc]init];

        [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
    }
    return self;
}

-(void)orientationChanged:(NSNotification *)notification
{
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
    if (UIDeviceOrientationIsLandscape(deviceOrientation) && !isShowingLandscapeView) {
        [self presentModalViewController:landscapeViewController animated:YES];
        isShowingLandscapeView = YES;
    }else if(UIDeviceOrientationIsPortrait(deviceOrientation) && isShowingLandscapeView){
        [self dismissModalViewControllerAnimated:YES];
        isShowingLandscapeView = NO;
    }
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    if (UIInterfaceOrientationIsPortrait(toInterfaceOrientation)) {
        return YES;
    }
    return NO;
}

...
@end

@implementation LandscapeViewController

- (id)init
{
    self = [super init];
    if (self) {
       self.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    }
    return self;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscape;
}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation)) {
        return YES;
    }
    return NO;
}

...
@end