iPhone 界面方向

Question

<分区>

Answer 1

iOS 6.0 引入了新的旋转方法并且不调用 shouldAutorotateToInterfaceOrientation:。

您需要实现这些方法以同时支持 iOS 6.0 之前的版本和 iOS 6.0+:

// Do as many checks as you want to allow for other orientations here for pre-iOS 6

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return (toInterfaceOrientation == UIInterfaceOrientationPortrait);
}

// You can return YES here as this still checks supportedInterfaceOrientations
// before rotating, or you can return NO to 'lock' the view in whatever it's in... 
// Making sure to return the appropriate value within supportedInterfaceOrientations

- (BOOL)shouldAutorotate
{
    return YES;
}

// return supported orientations, bitwised OR-ed together

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

编辑 - 如果您的 UIViewController 在 UINavigationController 的层次结构中

如果您的 View Controller 在 UINavigationController 的 View 层次结构中，则旋转方法实际上是在导航 Controller (而不是 View Controller )上调用的...这由 Apple 在我的意见，但是您可以执行以下操作以允许 View Controller 改为响应这些方法-

在 UINavigationController 上创建一个类别，方法如下:

// UINavigationController+Additions.h file

@interface UINavigationController (Additions)
@end




// UINavigationController+Additions.m file

#import "UINavigationController+Additions.h"

@implementation UINavigationController (Additions)

- (BOOL)shouldAutorotate
{
    return YES;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    UIViewController *viewController = [self topViewController];

    if ([viewController respondsToSelector:@selector(shouldAutorotateToInterfaceOrientation:)])
    {
        return [viewController shouldAutorotateToInterfaceOrientation:toInterfaceOrientation];
    }

    return [super shouldAutorotateToInterfaceOrientation:toInterfaceOrientation];
}

- (NSUInteger)supportedInterfaceOrientations
{
    UIViewController *viewController = [self topViewController];

    if ([viewController respondsToSelector:@selector(supportedInterfaceOrientations)])
    {
        return [viewController supportedInterfaceOrientations];
    }

    return [super supportedInterfaceOrientations];
}

@end

编辑 2 - 如果您的 UIViewController 在 UITabBarController 的选项卡中

如果您的 View Controller 位于 UITabBarController 的选项卡内，则会出现同样的问题。

再次在 UITabBarController 上创建一个类别以允许 View Controller 响应:

// UITabBarController+Additions.h file

@interface UITabBarController (Additions)
@end

// UITabBarController+Additions.m file

#import "UITabBarController+Additions.h"

@implementation UITabBarController (Additions)

- (BOOL)shouldAutorotate
{
    return YES;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    UIViewController *selectedViewController = [self selectedViewController];

    if ([selectedViewController respondsToSelector:@selector(shouldAutorotateToInterfaceOrientation:)])
    {
    return [selectedViewController shouldAutorotateToInterfaceOrientation:toInterfaceOrientation];
    }

    return [super shouldAutorotateToInterfaceOrientation:toInterfaceOrientation];
}

- (NSUInteger)supportedInterfaceOrientations
{
    UIViewController *selectedViewController = [self selectedViewController];

    if ([selectedViewController respondsToSelector:@selector(supportedInterfaceOrientations)])
    {
        return [selectedViewController supportedInterfaceOrientations];
    }

    return [super supportedInterfaceOrientations];
}

@end

编辑 3

这里还有一些关于 Objective-C 类别的链接:

http://macdevelopertips.com/objective-c/objective-c-categories.html

http://mobile.tutsplus.com/tutorials/iphone/objective-c-categories/