如何在推送转换时停止动画的UINavigationBar标题

Question

当我推/弹视图控制器时，有没有办法阻止UINavigationBar上的titleView动画。每个屏幕的TitleView都相同（应用程序的徽标）。

目前，当我推送视图时，导航栏上的titleView也会随视图一起滑动。

Answer 1

尝试，

[self.navigationController pushViewController:viewController animated:NO];

Answer 2

- (void)viewDidLoad
{
    self.navigationItem.title=@"";

    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

Answer 3

将每个视图控制器中导航项的标题设置为空字符串，并将UILabel子视图添加到导航栏：

UILabel *titleLabel = [[UILabel alloc] initWithFrame:self.navigationController.navigationBar.bounds];
titleLabel.font = [UIFont fontWithName:@"Avenir-Roman"
                                  size:20.f];
titleLabel.text = @"TEST TITLE";
titleLabel.textAlignment = NSTextAlignmentCenter;
[self.navigationController.navigationBar addSubview:titleLabel];

这应该为您提供一个静态标题，在视图控制器之间切换时不会移动。

Answer 4

迅速

可行的解决方案是：

使用UINavigationController委托方法来查明何时显示UIViewController。然后对于每个UIViewController，需要创建一个类似于isInitialized属性的布尔变量，它可以帮助您确定何时将UIViewController压入堆栈，或者何时将其显示在下一个视图控制器的后面。

你的FirstViewController：

func navigationController(_ navigationController: UINavigationController, willShowViewController viewController: UIViewController, animated: Bool) {
        if viewController == self {
            if self.isInitialized {
                var navigationBarAnimation = CATransition()
                navigationBarAnimation.duration = 1.5
                navigationBarAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)
                navigationBarAnimation.type = kCATransitionFade
                navigationBarAnimation.subtype = kCATransitionFade
                navigationBarAnimation.removedOnCompletion = true
                self.navigationController?.navigationBar?.layer?.addAnimation(navigationBarAnimation, forKey: nil)
                }
                else 
                {
                        self.isInitialized = true;
                }
        }
}

func navigationController(_ navigationController: UINavigationController, didShowViewController viewController: UIViewController, animated: Bool) {
        if viewController == self {
            if self.isInitialized {
                self.navigationController?.navigationBar?.layer?.removeAllAnimations()
            }
        }
}

你的SecondViewController：

func navigationController(_ navigationController: UINavigationController, willShowViewController viewController: UIViewController, animated: Bool) {
        if viewController == self {
            if !self.isInitialized {
                var navigationBarAnimation = CATransition()
                navigationBarAnimation.duration = 1.5
                navigationBarAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)
                navigationBarAnimation.type = kCATransitionFade
                navigationBarAnimation.subtype = kCATransitionFade
                navigationBarAnimation.removedOnCompletion = true
                self.navigationController?.navigationBar?.layer?.addAnimation(navigationBarAnimation, forKey: nil)
                        self.isInitialized = true;
                }
        }
}

func navigationController(_ navigationController: UINavigationController, didShowViewController viewController: UIViewController, animated: Bool) {
        if viewController == self {
            if self.isInitialized {
                self.navigationController?.navigationBar?.layer?.removeAllAnimations()
            }
        }
}