Question

我在iOS导航栏中的titleView遇到问题。我已经为titleView创建了一个自定义视图，但是每当我按下另一个控制器时，当我回到第一个视图控制器时，titleView就会立即出现并消失。这是我的代码。

 override func viewDidLoad() {
            super.viewDidLoad()
    let logo = UIImage(named: "img_appbar_logo")?.withRenderingMode(UIImageRenderingMode.alwaysTemplate)
                logoContainer = UIView(frame: CGRect(x: 0, y: 0, width: 180, height: 40))
                logoContainer.backgroundColor = UIColor.clear
    
                animatedLogo = UIImageView(frame:  CGRect(x: 0, y: 0, width: logoContainer.frame.width, height: logoContainer.frame.height))
                animatedLogo.contentMode = .scaleAspectFit
                animatedLogo.clipsToBounds = true
                animatedLogo.image = logo
                
                logoContainer.addSubview(animatedLogo)
       
                navigationItem.titleView = logoContainer
    }

Answer 1

在titleWillAppear中设置titleView，因为titleView被以前的控制器中的标题替换了

Answer 2

我已经解决了导航栏中与titleView有关的问题。我发现在按下另一个控制器并弹出后，titleView将被NavigationItem中的空UILabel视图取代。这就是titleView出现然后消失的原因。

我如何解决此问题？

我将自定义视图直接添加到导航栏中。这是代码

 let logo = UIImage(named: "img_appbar_logo")?.withRenderingMode(UIImageRenderingMode.alwaysTemplate)
                        logoContainer = UIView(frame: CGRect(x: 0, y: 0, width: 180, height: 40))
    
                        logoContainer.backgroundColor = UIColor.red
        
                        animatedLogo = UIImageView(frame:  CGRect(x: 0, y: logoContainer.frame.origin.y, width: logoContainer.frame.width, height: logoContainer.frame.height))
                        animatedLogo.contentMode = .scaleAspectFit
                        animatedLogo.clipsToBounds = true
                        animatedLogo.image = logo
                
                        logoContainer.addSubview(animatedLogo)
                
                
                navigationController?.navigationBar.addSubview(logoContainer) <--- new
//navigationItem.titleView = logoContainer <---- old

然后删除viewWillDisappear上的视图

override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        logoContainer.removeFromSuperview()
    }

导航栏标题视图中的自定义视图消失iOS Swift

2 个答案: