未调用UINavigationControllerDelegate方法(github上的演示代码)

Question

弹出到不支持当前方向的视图控制器时未调用的UINavigationControllerDelegate方法.

我有一个UINavigationController作为我的应用程序的根视图控制器(我的Storyboard中的初始视图控制器).

假设我将ViewController A推送到方向:

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

因此,我们不支持任何横向模式.最重要的是,让我们用另一个代码推送另一个ViewController:

@interface B : UIViewController <UINavigationControllerDelegate>
@end

@implementation B
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;   // any orientation supported
}

- (void)viewDidLoad {
    [super viewDidLoad];

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    UINavigationController *nc = (UINavigationController*)appDelegate.window.rootViewController;
    nc.delegate = self;
}

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // not always called...
}

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // not always called...
}
@end

现在,如果我有我的iPhone在纵向和我推A的顶视图控制器B,通过一些触摸事件,然后点击导航条上的"返回"按钮,一切都很好,并委托方法被调用(我做一些东西有).

但是,如果,当我正在查看视图B时,我旋转到横向,然后点击后退按钮,那些委托方法不会被调用!! 如果有时调用方法而不调用其他方法,那么为UINavigationController设置委托有什么意义呢？当然,我做错了什么.

我尝试将委托放在其他类中,如AppDelegate或我的MainView,没有任何变化.

有任何想法吗 ？

演示代码在这里: git://github.com/malaba/NavBarTest.git

从基本的Master-Detail模板,如上修改.

如何表明我的观点？这是一步一步:

1. 在主视图中添加一些行(+右上角)
2. 然后触摸一条线进入详细信息视图
3. 请参阅显示的登录输出
4. 点击后退按钮(标有"Master"),再次显示日志.

现在尝试在详细信息视图中旋转iPhone(或模拟器),然后"返回"并看到没有日志显示？!

Answer 1

由 Kaspar 回答，这是我在 Obj-C 中的代码。

。H：

@interface ProperNavigationController : UINavigationController

@end

@interface ProperNavigationControllerDelegate : NSObject <UINavigationControllerDelegate>
@property (assign, nonatomic) BOOL wasCalled;
@end

.米：

#import "ProperNavigationController.h"

@interface ProperNavigationController ()
@property (strong, nonatomic) id<UINavigationControllerDelegate> oldDelegate;
@property (strong, nonatomic) ProperNavigationControllerDelegate *myDelegate;
@end

@implementation ProperNavigationController
@synthesize oldDelegate = _oldDelegate;
@synthesize myDelegate = _myDelegate;

- (void)viewDidLoad {
    [super viewDidLoad];

    self.oldDelegate = self.delegate;
    self.myDelegate = [ProperNavigationControllerDelegate new];
    self.delegate = self.myDelegate;
}

- (UIViewController *)popViewControllerAnimated:(BOOL)animated {
    self.myDelegate.wasCalled = FALSE;

    UIViewController *vc = [super popViewControllerAnimated:animated];

    if (!self.myDelegate.wasCalled) {
        // if iOS did not call the delegate handler then we must do it
        [self.myDelegate navigationController:self willShowViewController:self.topViewController animated:animated];
        [self.myDelegate navigationController:self didShowViewController:self.topViewController animated:animated];
    }

    return vc;
}

@end

@implementation ProperNavigationControllerDelegate
@synthesize wasCalled = _wasCalled;     // flag that we use to track whether iOS calls the handlers or we have to 

- (id)init {
    if (self = [super init]) {
       _wasCalled = FALSE; 
    }
    return self;
}

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    ProperNavigationController *nc = (ProperNavigationController *)navigationController;
    [nc.oldDelegate navigationController:navigationController willShowViewController:viewController animated:animated];
    self.wasCalled = TRUE;  // signal that we have been called
}

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    ProperNavigationController *nc = (ProperNavigationController *)navigationController;
    [nc.oldDelegate navigationController:navigationController didShowViewController:viewController animated:animated];
}

@end

这行得通。

你怎么认为 ？我们应该填写错误报告吗？