强制横竖屏显示，手动设置屏幕的显示方向，拦截navigation

强制横竖屏
设置横竖屏支持模式：
1.项目配置：General -> Deployment Info -> Device Orientation
2.AppDelegate中设置：

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window

强制设置屏幕模式：
1.KVC:

NSNumber *orientationTarget = [NSNumber numberWithInt:interfaceOrientation];// 设置成想要的方向
        
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];

2.NSInvocation

    if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
        SEL selector  = NSSelectorFromString(@"setOrientation:");
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        int val = orientation;
        // 从2开始是因为0 1 两个参数已经被selector和target占用
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }

当每次设置UIDevice 的orientation属性后，都会调用AppDelegate：supportedInterfaceOrientationsForWindow方法，所以这个方法也需要动态的去支持不同的方向，以便达到想要的效果。

拓展知识点：
当我们设置横屏后，点击左上角的返回按钮的事件可能用户的需求是恢复竖屏
获取到navigationItem的点击事件：UINavigationBar 的代理方法UIBarPositioningDelegate

- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPushItem:(UINavigationItem *)item; // called to push. return NO not to.
- (void)navigationBar:(UINavigationBar *)navigationBar didPushItem:(UINavigationItem *)item;    // called at end of animation of push or immediately if not animated
- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item;  // same as push methods
- (void)navigationBar:(UINavigationBar *)navigationBar didPopItem:(UINavigationItem *)item;

demo