IOS 6 强制设备方向为横向 [英] IOS 6 force device orientation to landscape

问题描述

我提供了一个包含 10 个视图控制器的应用程序.我使用导航控制器来加载/卸载它们.

I gave an app with say 10 view controllers. I use navigation controller to load/unload them.

除一个外，其他所有模式都处于纵向模式.假设第 7 个 VC 在横向.我需要它在加载时以横向显示.

All but one are in portrait mode. Suppose the 7th VC is in landscape. I need it to be presented in landscape when it gets loaded.

请提出一种在 IOS 6 中强制方向从纵向变为横向的方法(并且在 IOS 5 中也能正常工作).

Please suggest a way to force the orientation go from portrait to landscape in IOS 6 (and it will be good to work in IOS 5 as well).

这是我在 之前 IOS 6 的做法:

Here is how I was doing it BEFORE IOS 6:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    UIViewController *c = [[[UIViewController alloc]init] autorelease];
    [self presentModalViewController:c animated:NO];
    [self dismissModalViewControllerAnimated:NO];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

呈现和关闭模态 VC 会迫使应用检查其方向，因此会调用 shouldAutorotateToInterfaceOrientation.

Presenting and dismissing a modal VC was forcing the app to review its orientation, so shouldAutorotateToInterfaceOrientation was getting called.

我在 IOS 6 中的尝试:

- (BOOL)shouldAutorotate{
    return YES;
}
-(NSUInteger)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskLandscape;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return UIInterfaceOrientationLandscapeLeft;
}

加载时，控制器保持纵向.旋转设备后，方向改变就好了.但是我需要让控制器在加载时自动旋转到横向，因此用户必须旋转设备才能正确查看数据.

On load, the controller keeps staying in portrait. After rotating the device, the orientation changes just ok. But I need to make the controller to rotate automatically to landscape on load, thus the user will have to rotate the device to see the data correctly.

另一个问题:将设备旋转回纵向后，方向变为纵向，尽管我在supportedInterfaceOrientations 中仅指定了UIInterfaceOrientationMaskLandscape.为什么会发生?

Another problem: after rotating the device back to portrait, the orientation goes to portrait, although I have specified in supportedInterfaceOrientations only UIInterfaceOrientationMaskLandscape. Why it happens?

此外，上述 3 个方法中的 NONE 被调用.

Also, NONE of above 3 methods are getting called.

一些(有用的)数据:

1. 在我的 plist 文件中，我指定了 3 个方向 - 几乎都是颠倒的.
2. 该项目是在 Xcode 4.3 IOS 5 中启动的.包括 xibs 在内的所有类都是在 Xcode 4.5 IOS 6 之前创建的，现在我使用的是最新版本.
3. 在 plist 文件中，状态栏设置为可见.
4. 在 xib 文件(我想要横向的文件)中，状态栏为无"，方向设置为横向.

感谢任何帮助.谢谢.

推荐答案

好的，伙计们，我会发布我的解决方案.

Ok, folks, I will post my solution.

我有什么:

1. 基于视图的应用程序，具有多个视图控制器.(它是基于导航的，但由于方向问题，我不得不让它基于视图).
2. 所有视图控制器都是纵向的，除了一个 - LandscapeLeft.

任务:

1. 我的一个视图控制器必须自动旋转为横向，无论用户如何握持设备.所有其他控制器都必须是纵向的，离开横向控制器后，应用必须强制旋转为纵向，无论用户如何握持设备.
2. 这必须像在 IOS 6.x 上一样在 IOS 5.x 上工作

去吧！

(更新删除了@Ivan Vučica 建议的宏)

(Update Removed the macros suggested by @Ivan Vučica)

在你所有的 PORTRAIT 视图控制器中，像这样覆盖自动旋转方法:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
    return (toInterfaceOrientation == UIInterfaceOrientationPortrait);
}
-(BOOL)shouldAutorotate {
    return YES;
}
- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskPortrait;
}

您可以看到两种方法:一种适用于 IOS 5，另一种适用于 IOS 6.

You can see the 2 approaches: one for IOS 5 and another For IOS 6.

与您的 LANDSCAPE 视图控制器相同，但有一些添加和更改:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
    [image_signature setImage:[self resizeImage:image_signature.image]];
    return (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}
-(BOOL)shouldAutorotate {
    return YES;
}
- (NSUInteger)supportedInterfaceOrientations {
    [image_signature setImage:[self resizeImage:image_signature.image]];
    return UIInterfaceOrientationMaskLandscapeLeft;
}

注意:要在 IOS 5 中强制自动旋转，您应该添加:

ATTENTION: to force autorotation in IOS 5 you should add this:

- (void)viewDidLoad{
    [super viewDidLoad];
    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 6.0)
        [[UIApplication sharedApplication] setStatusBarOrientation:UIDeviceOrientationLandscapeLeft animated:NO];    
}

类似地，在您离开 LANDSCAPE 控制器后，无论您加载什么控制器，您都应该为 IOS 5 再次强制自动旋转，但现在您将使用 UIDeviceOrientationPortrait，因为您转到 PORTRAIT 控制器:

Analogically, after you leave the LANDSCAPE controller, whatever controller you load, you should force again autorotation for IOS 5, but now you will use UIDeviceOrientationPortrait, as you go to a PORTRAIT controller:

- (void)viewDidLoad{
        [super viewDidLoad];
        if ([[[UIDevice currentDevice] systemVersion] floatValue] < 6.0)
            [[UIApplication sharedApplication] setStatusBarOrientation:UIDeviceOrientationPortrait animated:NO];    
    }

现在最后一件事(有点奇怪) - 您必须根据 IOS 更改从控制器切换到另一个控制器的方式:

创建一个 NSObject 类Schalter"(德语中的Switch").

Make an NSObject class "Schalter" ("Switch" from German).

在 Schalter.h 中说:

In Schalter.h say:

#import <Foundation/Foundation.h>

@interface Schalter : NSObject
+ (void)loadController:(UIViewController*)VControllerToLoad andRelease:(UIViewController*)VControllerToRelease;
@end

在 Schalter.m 中说:

In Schalter.m say:

#import "Schalter.h"
#import "AppDelegate.h"

@implementation Schalter
+ (void)loadController:(UIViewController*)VControllerToLoad andRelease:(UIViewController*)VControllerToRelease{

    //adjust the frame of the new controller
    CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
    CGRect windowFrame = [[UIScreen mainScreen] bounds];
    CGRect firstViewFrame = CGRectMake(statusBarFrame.origin.x, statusBarFrame.size.height, windowFrame.size.width, windowFrame.size.height - statusBarFrame.size.height);
    VControllerToLoad.view.frame = firstViewFrame;

    //check version and go
    if (IOS_OLDER_THAN_6)
        [((AppDelegate*)[UIApplication sharedApplication].delegate).window addSubview:VControllerToLoad.view];
    else
        [((AppDelegate*)[UIApplication sharedApplication].delegate).window setRootViewController:VControllerToLoad];

    //kill the previous view controller
    [VControllerToRelease.view removeFromSuperview];
}
@end

现在，这就是您使用 Schalter 的方式(假设您从仓库控制器转到产品控制器):

#import "Warehouse.h"
#import "Products.h"

@implementation Warehouse
Products *instance_to_products;

- (void)goToProducts{
    instance_to_products = [[Products alloc] init];
    [Schalter loadController:instance_to_products andRelease:self];
}

bla-bla-bla your methods

@end

当然你必须释放instance_to_products对象:

- (void)dealloc{
     [instance_to_products release];
     [super dealloc];
}

嗯，就是这样.不要犹豫，投反对票，我不在乎.这是为那些正在寻找解决方案的人准备的，而不是为了声誉.干杯!萨瓦·马扎雷.

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