Iphone 如何在方向更改时切换视图

我目前正在创建一个包含六个视图的应用程序，每个视图都专用于设备类型和方向的组合。如果您不明白我的意思，我将标记所有六种组合：

• iPhone4（320x480）和肖像
• iPhone4（320x480）和景观
• iPhone5（320x568）和肖像
• iPhone5（320x568）和景观
• iPad（768x1024）和肖像
• iPad（768x1024）和横向

我知道经历所有这些麻烦似乎有点傻，但在这种情况下这是必要的。不管怎样，我一直在尝试将苹果的解决方案与在线教程中给出的方法结合起来

ViewController.m

-->

ViewDidLoad

方法

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

- (void) orientationChanged:(NSNotification *)object
{
    UIDeviceOrientation deviceOrientation = [[object object] orientation];
    if (deviceOrientation == UIInterfaceOrientationPortrait && [UIScreen mainScreen].bounds.size.height == 480.0)
    {
        self.view = self.portrait4View;
    }
    else if ((deviceOrientation == UIInterfaceOrientationLandscapeLeft) || (deviceOrientation == UIInterfaceOrientationLandscapeRight)) && [UIScreen mainScreen].bounds.size.height == 480.0)
    {
        self.view = self.landscape4View;
    }
    else if (deviceOrientation == UIInterfaceOrientationPortrait && [UIScreen mainScreen].bounds.size.height == 568.0)
    {
        self.view = self.portrait5View;
    }
    else if ((deviceOrientation == UIInterfaceOrientationLandscapeLeft) || (deviceOrientation == UIInterfaceOrientationLandscapeRight)) && [UIScreen mainScreen].bounds.size.height == 568.0)
    {
        self.view = self.landscape5View;
    }
    else if (deviceOrientation == UIInterfaceOrientationPortrait && [UIScreen mainScreen].bounds.size.height == 1024.0)
    {
        self.view = self.portraitPadView;
    }
    else
    {
        self.view = self.landscapePadView;
    }

}

ViewController.m

-->

orientationChanged

方法

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

- (void) orientationChanged:(NSNotification *)object
{
    UIDeviceOrientation deviceOrientation = [[object object] orientation];
    if (deviceOrientation == UIInterfaceOrientationPortrait && [UIScreen mainScreen].bounds.size.height == 480.0)
    {
        self.view = self.portrait4View;
    }
    else if ((deviceOrientation == UIInterfaceOrientationLandscapeLeft) || (deviceOrientation == UIInterfaceOrientationLandscapeRight)) && [UIScreen mainScreen].bounds.size.height == 480.0)
    {
        self.view = self.landscape4View;
    }
    else if (deviceOrientation == UIInterfaceOrientationPortrait && [UIScreen mainScreen].bounds.size.height == 568.0)
    {
        self.view = self.portrait5View;
    }
    else if ((deviceOrientation == UIInterfaceOrientationLandscapeLeft) || (deviceOrientation == UIInterfaceOrientationLandscapeRight)) && [UIScreen mainScreen].bounds.size.height == 568.0)
    {
        self.view = self.landscape5View;
    }
    else if (deviceOrientation == UIInterfaceOrientationPortrait && [UIScreen mainScreen].bounds.size.height == 1024.0)
    {
        self.view = self.portraitPadView;
    }
    else
    {
        self.view = self.landscapePadView;
    }

}

每个视图的界面生成器设置：

我还收到了一条关于

预期标识符的错误消息

：

更新 每当我启动应用程序时，我都会看到一个黑屏。下面是我的

AppDelegate.m

的外观：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone && [UIScreen mainScreen].bounds.size.height == 568.0) {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_Portrait5" bundle:nil];
    }
    
    else if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone && [UIScreen mainScreen].bounds.size.height == 480.0) {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_Portrait4" bundle:nil];
    }

    else {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_PortraitPad" bundle:nil];
    }
}

---

与

预期标识符相关的错误是因为您的参数错误。您的
if
条件应该是（我在其他几个条件中也看到了相同的错误）：

非常感谢你，现在我只是觉得自己很愚蠢，因为我没有注意到这一点。你有没有可能在我上次更新时也帮我添加到原始帖子中？我看到了问题，知道你更新的解决方案。请把它作为一个单独的问题贴出来，我会在那里回答。同时，请接受第一个问题的答案。谢谢