在iPad iOS 4.3中支持纵向和横向界面方向的最佳实践

在文件中,

他们使用了在iOS 5.0及更高版本中可用的performsguewithidentifier:sender:和dismissViewControllerAnimated:completion:

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在iOS 4.3中，是否有任何聪明的方法可以为不同的ipad界面方向使用多个NIB。

假设您有一个肖像视图控制器和一个景观视图控制器

您将需要以下内容：

@interface PortraitViewController : UIViewController {
    BOOL isShowingLandscapeView;
    LandscapeViewController *landscapeViewController;
}

@implementation PortraitViewController

- (void)viewDidLoad 
{
    [super viewDidLoad];

    landscapeMainViewController = [[LandscapeMainViewController alloc] initWithNibName:@"LandscapeMainViewController" bundle:nil];

    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

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

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [[UIDevice currentDevice]  endGeneratingDeviceOrientationNotifications];
    [landscapeMainViewController release]; landscapeMainViewController = nil;
    [super dealloc];
}

- (void)orientationChanged:(NSNotification *)notification
{
    [self performSelector:@selector(updateLandscapeView) withObject:nil afterDelay:0];
}

- (void)updateLandscapeView
{
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
    if (UIDeviceOrientationIsLandscape(deviceOrientation) && !isShowingLandscapeView)
    {
        [self presentModalViewController:landscapeMainViewController animated:YES];
        isShowingLandscapeView = YES;
    }
    else if (deviceOrientation == UIDeviceOrientationPortrait && isShowingLandscapeView)
    {
        [self dismissModalViewControllerAnimated:YES];
        isShowingLandscapeView = NO;
    }
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end


@interface LandscapeViewController : UIViewController
@end

@implementation LandscapeViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    if (self = [super initWithNibName:nibNameOrNil  bundle:nibBundleOrNil])
    {
        self.wantsFullScreenLayout = YES;
        self.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    }
    return self;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}

@end

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