在 iPad iOS 4.3 中支持纵向和横向界面方向的最佳实践答案

【问题标题】：Best practice to support portrait and landscape interface orientations in a iPad iOS 4.3在 iPad iOS 4.3 中支持纵向和横向界面方向的最佳实践
【发布时间】：2012-01-26 08:17:39
【问题描述】：

在文档中，

http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/RespondingtoDeviceOrientationChanges/RespondingtoDeviceOrientationChanges.html#//apple_ref/doc/uid/TP40007457-CH7-SW6

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

在 iOS 4.3 中是否有任何智能方法可以将多个笔尖用于不同的 ipad 界面方向。

【问题讨论】：

标签： ipad ios4 uiviewcontroller orientation nib

【解决方案1】：

假设您有一个 PortraitViewController 和一个 LandscapeViewController。

您将需要以下物品：

@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

致谢：http://www.edumobile.org/iphone/iphone-programming-tutorials/alternativeviews-in-iphone/

【讨论】：