iPad 模态视图控制器以纵向动作，即使它是横向的

Question

我在横向模式下呈现 ModalViewController 时遇到了一些困难。基本上，它会以正确的界面方向显示，并且仅当设备处于横向模式时才会旋转，但视图控制器的行为就像处于纵向模式一样。

我正在展示这样的模态

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
    self.window.rootViewController = navController;
    [self.window makeKeyAndVisible];

    LoginViewController *lvc = [[LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:[NSBundle mainBundle]];
    [self.window.rootViewController presentModalViewController:lvc animated:NO];

    return YES;
}

在登录视图控制器中

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    NSLog(@"%@",NSStringFromCGRect(self.view.frame));
    return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}    

几轮旋转后的日志结果：

2012-03-06 13:51:49.308 OrientationTest[3132:207] {{0, 0}, {1024, 748}}
2012-03-06 13:51:49.310 OrientationTest[3132:207] {{0, 0}, {1024, 748}}
2012-03-06 13:51:49.310 OrientationTest[3132:207] {{0, 0}, {1024, 748}}
2012-03-06 13:51:49.310 OrientationTest[3132:207] {{0, 0}, {1024, 748}}
2012-03-06 13:51:49.313 OrientationTest[3132:207] {{0, 20}, {1024, 748}}
2012-03-06 13:51:49.314 OrientationTest[3132:207] {{0, 0}, {748, 1024}}
2012-03-06 13:51:49.315 OrientationTest[3132:207] {{20, 0}, {748, 1024}}
2012-03-06 13:51:50.991 OrientationTest[3132:207] {{20, 0}, {748, 1024}}
2012-03-06 13:51:50.991 OrientationTest[3132:207] {{20, 0}, {748, 1024}}
2012-03-06 13:51:51.647 OrientationTest[3132:207] {{20, 0}, {748, 1024}}
2012-03-06 13:51:51.648 OrientationTest[3132:207] {{0, 0}, {748, 1024}}
2012-03-06 13:51:53.481 OrientationTest[3132:207] {{0, 0}, {748, 1024}}
2012-03-06 13:51:53.482 OrientationTest[3132:207] {{0, 0}, {748, 1024}}
2012-03-06 13:51:53.897 OrientationTest[3132:207] {{0, 0}, {748, 1024}}
2012-03-06 13:51:53.898 OrientationTest[3132:207] {{20, 0}, {748, 1024}}

基本上，loginViewController 就像处于纵向模式一样。我在这个视图上有两个文本字段，当我点击其中一个时，我想向上移动视图，这样键盘就不会显示在文本字段上。为了做到这一点，我必须修改 frame.origin.x 而不是 y，因为轴是倒置的（视图就像纵向一样），这会导致很多问题。

编辑：

如果我将 LoginViewController 上的模态演示样式更改为 UIModalPresentationPageSheet，它会按预期工作，因此仅全屏模式存在一些问题

第二次编辑：

我已将代码精简为基础。我什至不再展示模态视图控制器，只是将该视图控制器初始化为根视图控制器，但这种情况仍在发生。

应用委托：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

在我的视图控制器中：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    NSLog(@"%@",NSStringFromCGRect( self.view.frame));
    return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}

Answer 1

好的，所以我终于找到了一种让它正常工作的方法。似乎如果您只是创建一个新的视图控制器并显示它总是会被反转。我发现的解决方法是将视图控制器放在导航控制器中。

LoginViewController *lvc = [[LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:[NSBundle mainBundle]];
UINavigationController *nvc = [[UINavigationController alloc] initWithRootViewController:lvc];
nvc.navigationBarHidden = YES;
lvc.modalPresentationStyle = UIModalPresentationFullScreen;
lvc.parentView = self.navController.view;
[self.window.rootViewController presentModalViewController:nvc animated:NO];

Answer 2

x/y 反转的帧是一个“功能”；）您缺少convertRect:fromView。在视图之间查看converting rects and points。

在您的情况下，您需要将键盘框架的矩形转换为视图控制器的主视图。没有看到你的键盘框架的东西我不知道，但它可能是这样的：

[self.view convertRect:keyboardFrame fromView:keyboardView];

Answer 3

改一下

    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    NSLog(@"%@",NSStringFromCGRect(self.view.frame));
    return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}    

进入这个

    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    NSLog(@"%@",NSStringFromCGRect(self.view.frame));
    return YES;
}