UISplitViewController 在尝试使用其中的 UINavigationController 后停止自动旋转

Question

我的 iPad 应用程序中的 UISplitViewController 遇到了一些问题。我正在尝试使用 UISplitView 内的 UINavigationController 制作一个简单的导航树。我已使用以下基本代码来执行此操作：

NavController.h

@interface NavController : NSObject {
    /* 
     * This is connected properly to the UINavigationController in the 
     * UISplitViewController through Interface Builder.
     */

    UINavigationController *navigationController;

 }

 @property (nonatomic, retain) IBOutlet UINavigationController *navigationController;

 @end

NavController.m

#import "NavController.h"

@implementation NavController

@synthesize navigationController;

- (void) awakeFromNib {
    UIViewController *testController = [[UIViewController alloc] init];
    UITableView *tableView = [[UITableView alloc] init];

    [testController setView: tableView];

    [navigationController pushViewController: testViewController
                                    animated: YES];

}

@end

这段代码成功地将视图推送到导航控制器，我可以使用后退按钮导航回来，但是，我的问题在于，发生这种情况后，我的 UISplitViewController 不再自动旋转或从纵向位置。当我删除此代码（并且视图不会被推送）时，它会按预期工作。

我做错了什么，我是否以正确的方式解决这个问题？

Answer 1

这也让我发疯了。我做了几件事使它起作用，但我对我的解决方案不满意——1）我不太了解它，2）它看起来很老套。

我将此添加到我的应用委托（我的 .m 文件）：

@interface UITabBarController (MyApp)
@end

@interface UINavigationController (MyApp)
@end

@implementation UITabBarController (MyApp) 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
    return YES;
}
@end

@implementation UINavigationController (MyApp) 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
    return YES;
}
@end

这在大多数情况下都有效。对于没有自动旋转的视图，我必须自己使用变换手动旋转视图。我做了类似的事情：

- (void)deviceOrientationDidChangeWithAnimation:(BOOL)animated {
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;

    if (orientation == oldOrientation) {
        return;
    }

    if (animated) {
        CGFloat duration = [UIApplication sharedApplication].statusBarOrientationAnimationDuration;
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:duration];
        [UIView setAnimationDidStopSelector:@selector(orientationChanged)];
    }

    [self sizeToFitOrientation:YES];

    if (animated) {
        [UIView commitAnimations];
    }

    oldOrientation = orientation;
}

- (CGAffineTransform)transformForOrientation {
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if (orientation == UIInterfaceOrientationLandscapeLeft) {
        return CGAffineTransformMakeRotation(M_PI*1.5); // rotated CCW
    } else if (orientation == UIInterfaceOrientationLandscapeRight) { // CW
        return CGAffineTransformMakeRotation(M_PI/2);
    } else if (orientation == UIInterfaceOrientationPortraitUpsideDown) { // CCW
        return CGAffineTransformMakeRotation(-M_PI);
    } else { // CW
        return CGAffineTransformIdentity;
    }
}

- (void)sizeToFitOrientation:(BOOL)transform {
    if (transform) {
        self.view.transform = CGAffineTransformIdentity;
    }

    CGRect frame = [UIScreen mainScreen].applicationFrame;
    CGPoint center = CGPointMake(frame.origin.x + ceil(frame.size.width/2), frame.origin.y + ceil(frame.size.height/2));

    CGFloat width = frame.size.width - 0 * 2;
    CGFloat height = frame.size.height - 0 * 2;

    UIInterfaceOrientation _orientation = [UIApplication sharedApplication].statusBarOrientation;
    if (UIInterfaceOrientationIsLandscape(_orientation)) {
        self.view.frame = CGRectMake(0, 0, height, width);
    } else {
        self.view.frame = CGRectMake(0, 0, width, height);
    }
    self.view.center = center;

    if (transform) {
        self.view.transform = [self transformForOrientation];
    }
}

希望这会有所帮助！如果有人能指出我犯过的错误（或我一直在做的坏事），我会很乐意学习。 :)