UIViewControllers 之间的自定义转换不起作用

Question

我有管理自定义转换的对象：

    @interface NavigationManager : NSObject <UIViewControllerAnimatedTransitioning>

    -(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext;
    -(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext;

    @property (nonatomic, assign) NSTimeInterval presentationDuration;
    @property (nonatomic, assign) NSTimeInterval dismissalDuration;
    @property (nonatomic, assign) BOOL isPresenting;


    @end

    @interface NavigationManager()

    @property (nonatomic, strong) id<UIViewControllerContextTransitioning> transitionContext;

    @end

    @implementation NavigationManager

    @synthesize presentationDuration, dismissalDuration, isPresenting;

    -(id)init{
        self = [super init];

        if(self){

            self.presentationDuration = 1.0;
            self.dismissalDuration = 0.5;
        }

        return self;
    }

    -(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{

        return self.isPresenting ? self.presentationDuration : self.dismissalDuration;
    }

    -(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext{


        self.transitionContext = transitionContext;
        if(self.isPresenting){
            [self executePresentation:transitionContext];
        }
        else{

            [self executeDismiss:transitionContext];
        }

    }

    ...


    @end

在应该处理实现转换的类中：

@interface ViewController : UIViewController <UIViewControllerTransitioningDelegate>

@property (nonatomic, strong) NavigationManager navigationManager;

..

@end

@implementation

...

//这里我正在导航到新的 UIViewController

 - (void)navigateToNewScreen
{
    DetailedNewsController *secVC = [[DetailedNewsController alloc] init];
    secVC.fullDescription = fullDescription;
    secVC.headerImage = a.imageView.image;
    self.transitioningDelegate = self;
    [self.navigationController pushViewController:secVC animated:YES];
}

 - (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented
presentingController:(UIViewController *)presenting
sourceController:(UIViewController *)source
{
    self.animationController.isPresenting = YES;
    return self.animationController;
}

 - (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
    self.animationController.isPresenting = NO;
    return self.animationManager;
}

@end

执行默认的过渡动画。导航后也不显示导航控制器栏。

更新：

我在 AppDelegate 中创建 UINavigationController 的方式存在问题：

firstVC = [[ViewController alloc] init];
navController = [[UINavigationController alloc] initWithRootViewController:firstVC];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor blackColor];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];

Answer 1

我会用你提供的新信息来回答。我之所以把它作为答案，是因为我只是不想给你一些复制粘贴代码，而是试图在它背后给出一个简短的解释。如果我理解正确，您现在想要呈现一个带有自定义转换的 ViewController。

因此，您可以通过将代码更改为以下代码来实现自定义转换：

secVC.transitioningDelegate = self; 
secVC.modalPresentationStyle = UIModalPresentationCustom; 
[self presentViewController:secVC animated:YES completion:nil];

自从我们启动并运行它后，目前缺少的是您要显示的 ViewController 的 NavigationBar。由于您正在呈现一个 ViewController，它不会包含在您正在呈现的 ViewController 所在的现有 NavigationController 堆栈中。

因此，您需要将要呈现的 VC 包装在 UINavigationController 中。

[self presentViewController:[[UINavigationController alloc] initWithRootViewController:secVC] animated:YES completion:nil];