在 Objective-C 中的 iOS 6 上强制横向方向

问题描述

我有一个位于 UINavigationController 内的主视图控制器.在那个主视图控制器中，我有一个按钮可以推动一个内部有 UIWebView 的详细视图控制器.我希望这个细节视图控制器在加载时处于横向模式.回到主视图控制器，它又强制回到纵向模式.我正在运行 iOS 6.

I have a master view controller that's inside a UINavigationController. In that master view controller, I have a button that pushes a detail view controller that has a UIWebView inside of it. I want this detail view controller to be on landscape mode when it's loaded. Going back to the master view controller, it forcibly goes back again to portrait mode. I'm running iOS 6 on this.

我已经看到了其他类似的问题，但它对我没有用.我创建了一个 LandscapeViewController，它是 UIViewController 的子类，我在其中编写了这些方法:

I have seen the other similar questions but it's not working on my end. I have created a LandscapeViewController that's a subclass of UIViewController where I have written these methods:

#pragma mark - Orientation Methods
- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscape;
}

- (BOOL)shouldAutorotate
{
    return YES;
}

这是我推送详细视图控制器时的代码:

This is my code when I push the detail view controller:

DetailViewController *detailVC = [[DetailViewController alloc]
                                      initWithNibName:@"DetailViewController"
                                      bundle:nil];

    [self.navigationController pushViewController:detailVC
                                         animated:YES];

我正在考虑在上面的代码中将 LandscapeViewController 子类化以使其工作，或者考虑如何正确子类化和推送我的详细视图控制器.如果导航控制器无法将我的详细视图控制器从纵向推到横向，我也可以模态显示我的详细视图控制器.我哪里做错了?

I'm thinking on where to subclass my LandscapeViewController on the code above to make it work or on how to properly subclass and push my detail view controller. I can also present my detail view controller modally if it's not possible for the navigation controller to push my detail view controller from portrait to landscape. Where am I doing it wrong?

推荐答案

考虑:视图 A:仅纵向 - 视图 B:仅横向

Considering: View A: Portrait only - View B: Landscape only

我无法在导航控制器中执行此操作.相反，我所做的是打开一个从视图 A 到视图 B 的模态视图，并强制一个新的导航控制器进入这个视图.

I couldn't do it in the navigation controller. Instead what I did was to open a modal view from view A to view B and force a new navigation controller into this view.

这在 iOS5+ 中对我有用.

This is working for me in iOS5+.

您需要像这样为导航控制器创建一个类别:

You need to create a category for the navigation controller like this:

UINavigationController+Rotation_IOS6.h

#import <UIKit/UIKit.h> 

@interface UINavigationController (Rotation_IOS6)

- (BOOL)shouldAutorotate;
- (NSUInteger)supportedInterfaceOrientations;
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation;

@end

UINavigationController+Rotation_IOS6.h

#import "UINavigationController+Rotation_IOS6.h"

@implementation UINavigationController (Rotation_IOS6)

- (BOOL)shouldAutorotate
{
    return [self.topViewController shouldAutorotate];
}

- (NSUInteger)supportedInterfaceOrientations
{
    return [self.topViewController supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return [self.topViewController preferredInterfaceOrientationForPresentation];
}

@end

在 AppDelegate.m 中添加:

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{
    return UIInterfaceOrientationMaskAll;
}

然后在视图A:

- (BOOL)shouldAutorotate {
    return YES;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationPortrait;
}

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

同样在视图 A 中打开视图 B:

ViewB *vc = [[ViewB alloc] initWithNibName:@"ViewB" bundle:nil];

UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:vc];

[self presentViewController:navigationController animated:YES completion:nil];

最后，在视图 B

- (BOOL)shouldAutorotate {
    return YES;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskLandscapeLeft;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationLandscapeRight;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}

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