xcode 模式视图控制器不会在横向模式下启动
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Modal View Controller Won't Start in Landscape Mode
提问by Glasswing
I have a navigation based app that has a detail view (UIWebView) with action buttons across the bottom in a UIToolbar. I want to add 'notes' when the 'notes' button is pushed. Everything works fine when the webview is in portrait mode. I press the notes button, the modal view opens fine and works great.
我有一个基于导航的应用程序，它有一个详细信息视图 (UIWebView)，在 UIToolbar 的底部有操作按钮。我想在按下“注释”按钮时添加“注释”。当 webview 处于纵向模式时，一切正常。我按下注释按钮，模态视图打开得很好，效果很好。
The problem occurs when the webview is in landscape mode. If I press the notes button, all the code to open the modal view gets called but all I get is a white screen. One comment: If I open the modal view in portrait and then rotate the device, it rotates fine into landscape mode. It just won't opencorrectly in landscape mode.
当 webview 处于横向模式时会出现问题。如果我按下注释按钮，所有打开模态视图的代码都会被调用，但我得到的只是一个白屏。一条评论：如果我以纵向打开模态视图，然后旋转设备，它会很好地旋转到横向模式。它只是无法在横向模式下正确打开。
I have another button that brings up the mail composer which has the identical behavior. Here is the code in my UIWebViewController:
我有另一个按钮可以调出具有相同行为的邮件编辑器。这是我的 UIWebViewController 中的代码：
- (IBAction)addNotes:(id)sender
{
NotesViewController *notesViewController;
// create the view controller and set it as the root view of a new navigation
// controller
notesViewController = [[NotesViewController alloc] initWithPrimaryKey:self.record.primaryKey];
UINavigationController *newNavigationController =
[[UINavigationController alloc] initWithRootViewController:notesViewController];
// present the navigation controller modally
[self presentModalViewController:newNavigationController animated:YES];
[notesViewController release];
[self.view setNeedsDisplay]; // not sure if I need this! I was trying different things...
[self.devotionText setNeedsDisplay]; // ditto...
[newNavigationController release];
}
Any ideas? I've tried all sorts of different things to no avail. I just get a white screen with no navigation bar (although there is a status bar at the top).
有任何想法吗？我尝试了各种不同的方法都无济于事。我只是得到一个没有导航栏的白屏（尽管顶部有一个状态栏）。
回答by MishieMoo
Modals don't always get information about rotations, and they get their info from the status bar, which doesn't always work right. Put this in your viewWillAppear to fix: [UIApplication sharedApplication].statusBarOrientation = self.interfaceOrientationAnd, if you want a navigation controller inside your modal, you need to create one.
模态并不总是获得有关旋转的信息，它们从状态栏获取它们的信息，这并不总是正常工作。把它放在你的 viewWillAppear 中来修复：[UIApplication sharedApplication].statusBarOrientation = self.interfaceOrientation而且，如果你想要一个导航控制器在你的模态中，你需要创建一个。
Also, you don't need the setNeedsDisplay. That only effects the current views, not the modal you are presenting.
此外，您不需要 setNeedsDisplay。这仅影响当前视图，而不影响您呈现的模式。
回答by Jimmy_m
Answer is here:
答案在这里：
https://stackoverflow.com/a/10250747/1449618
https://stackoverflow.com/a/10250747/1449618
Use the window's root view controller to present:
[self.view.window.rootViewController presentViewController:masterView
animated:YES
completion:NULL];
回答by PrimaryFeather
Wow, I lost days over that issue ... but I found a solution!
哇，我在那个问题上浪费了好几天……但我找到了解决方案！
I had the same problem you had: the method "presentModalViewController:animated:" only worked in portrait mode.
我遇到了与您相同的问题：方法“presentModalViewController:animated:”只能在纵向模式下工作。
After a lot of trial and error, I found out that the reason was that I had several view controllers active at the same time. I implemented a navigation system which switched between different view controllers, with one parent handling the children. (I could not use UINavigationController, because I needed a different look.)
经过大量的反复试验，我发现原因是我同时有多个视图控制器处于活动状态。我实现了一个导航系统，可以在不同的视图控制器之间切换，一个家长处理孩子。（我无法使用 UINavigationController，因为我需要不同的外观。）
So, my root view controller had a root view object, and several child view controllers. When a child view controller was activated, its view object was added as subview to the view of the root view controller.
所以，我的根视图控制器有一个根视图对象和几个子视图控制器。当子视图控制器被激活时，它的视图对象作为子视图添加到根视图控制器的视图中。
The "presentModalViewController" method didn't like that. However, as soon as I set the "parentViewController" property of the child view controllers, it worked!
“presentModalViewController”方法不喜欢那样。但是，一旦我设置了子视图控制器的“parentViewController”属性，它就起作用了！
The problem is only that "parentViewController" is a read-only property. You have to extend the UIViewController class so you can access it.
问题仅在于“parentViewController”是只读属性。您必须扩展 UIViewController 类才能访问它。
@interface UIViewController (HelperExtension)
@property (nonatomic, assign) UIViewController *parent;
@end
@implementation UIViewController (HelperExtension)
- (UIViewController *)parent
{
return self.parentViewController;
}
- (void)setParent:(UIViewController *)parent
{
[self setValue:parent forKey:@"_parentViewController"];
}
@end
So, whenever you add the view of a child view controller to your parent view controller, call the "setParent:" method after doing it. Then it will work!
因此，每当您将子视图控制器的视图添加到父视图控制器时，请在完成后调用“setParent:”方法。然后它会起作用！
回答by ??u??
Got the same issue when presenting modally a navigation controller. Be sure to have correctly implement : shouldAutorotateToInterfaceOrientation
以模态方式呈现导航控制器时遇到了同样的问题。确保正确实现： shouldAutorotateToInterfaceOrientation
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
BOOL shouldAutorotate = NO;
if( isControllerMangingAllOrientations )
{
shouldAutorotate = YES;
}
else
{
shouldAutorotate = (toInterfaceOrientation == UIInterfaceOrientationPortrait);
}
return shouldAutorotate;
}
I was setting the boolean in the viewDidLoad method, not a good idea. Putting it in the initWithNibName:bundle: method is the right place.
我在 viewDidLoad 方法中设置了布尔值，这不是一个好主意。把它放在 initWithNibName:bundle: 方法中是正确的地方。
回答by seymatanoglu
If you use presentModalViewController just for animation like me, you can use pushViewController with animation as below answer;
如果您像我一样仅将presentModalViewController 用于动画，则可以将pushViewController 与动画一起使用，如下所示；
Showing pushviewcontroller animation look like presentModalViewController
显示 pushviewcontroller 动画看起来像 presentModalViewController
and you can close the viewController as below;
你可以关闭 viewController 如下；
CATransition* transition = [CATransition animation];
transition.duration = 0.3;
transition.type = kCATransitionFade;
transition.subtype = kCATransitionFromTop;
[self.navigationController.view.layer addAnimation:transition forKey:kCATransition];
[self.navigationController popViewControllerAnimated:NO];
Hope it helps..
希望能帮助到你..
回答by David
I had the task to show a video player in landscape mode.
我的任务是在横向模式下显示视频播放器。
AVPlayerViewController *playerViewController = [AVPlayerViewController new];
//Player init code goes here....
// #define degreesToRadian(x) (M_PI * (x) / 180.0) - was defined previously in a class header
playerViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
playerViewController.view.transform = CGAffineTransformMakeRotation(degreesToRadian(90));
playerViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
[self presentViewController:playerViewController animated:YES completion:nil];
回答by Stephen Furlani
You don't need a new Navigation Controller.
您不需要新的导航控制器r。
- (IBAction)addNotes:(id)sender {
NotesViewController *notesViewController;
// create the view controller and set it as the root view of a new navigation
// controller
notesViewController = [[NotesViewController alloc] initWithPrimaryKey:self.record.primaryKey];
[self.navigationController pushViewController: notesViewController animated: YES];
[notesViewController release];
}
