Question

我想通过使用徽标图片作为导航栏的标题来自定义我的应用程序外观，而不是纯文本。当我使用这段代码时

let logo = UIImage(named: "logo.png")
self.navigationItem.titleView = logo;

我收到错误＆＃34; UIImage无法转换为UIView＆＃34;。我怎么能正确地做到这一点？

Answer 1

将其放入UIImageView

let logo = UIImage(named: "logo.png")
let imageView = UIImageView(image:logo)
self.navigationItem.titleView = imageView

Answer 2

我用这个。它适用于iOS 8

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    let image = UIImage(named: "YOURIMAGE")
    navigationItem.titleView = UIImageView(image: image)
}

以下是一个如何使用CGRect进行此操作的示例。

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 38, height: 38))
    imageView.contentMode = .ScaleAspectFit
    let image = UIImage(named: "YOURIMAGE")
    imageView.image = image
    navigationItem.titleView = imageView
}

希望这会有所帮助。

Answer 3

对于swift 4，您可以调整imageView大小

 let logoContainer = UIView(frame: CGRect(x: 0, y: 0, width: 270, height: 30))

 let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 270, height: 30))
 imageView.contentMode = .scaleAspectFit
 let image = UIImage(named: "your_image")
 imageView.image = image
 logoContainer.addSubview(imageView)
 navigationItem.titleView = logoContainer

Answer 4

您可以使用自定义UINavigationItem，因此您只需要更改＆＃34;导航项＆＃34;作为Main.storyboard上的YourCustomClass。

在Swift 3中

class FixedImageNavigationItem: UINavigationItem {

private let fixedImage : UIImage = UIImage(named: "your-header-logo.png")!
private let imageView : UIImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 37.5))

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    imageView.contentMode = .scaleAspectFit
    imageView.image = fixedImage
    self.titleView = imageView

}

}

Answer 5

我在上面尝试了@Jack的回答，徽标确实出现了但是图像占据了整个导航栏。我希望它适合。

Swift 4，Xcode 9.2

1.为导航控制器UIImage分配值。通过分割帧和图像大小来调整大小。

func addNavBarImage() {

        let navController = navigationController!

        let image = UIImage(named: "logo-signIn6.png") //Your logo url here
        let imageView = UIImageView(image: image)

        let bannerWidth = navController.navigationBar.frame.size.width
        let bannerHeight = navController.navigationBar.frame.size.height

        let bannerX = bannerWidth / 2 - (image?.size.width)! / 2
        let bannerY = bannerHeight / 2 - (image?.size.height)! / 2

        imageView.frame = CGRect(x: bannerX, y: bannerY, width: bannerWidth, height: bannerHeight)
        imageView.contentMode = .scaleAspectFit

        navigationItem.titleView = imageView
    }

在viewDidLoad()
下添加功能
```
    addNavBarImage() 
```

关于图片资产的注意事项。在上传之前，我使用额外的边距调整徽标，而不是在边缘裁剪。

最终结果：

Answer 6

2015年9月这对我有用 - 希望这有助于那里的人。

// 1
    var nav = self.navigationController?.navigationBar
    // 2 set the style 
    nav?.barStyle = UIBarStyle.Black
    nav?.tintColor = UIColor.yellowColor()
    // 3
    let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
    imageView.contentMode = .ScaleAspectFit
    // 4
    let image = UIImage(named: "logo.png")
    imageView.image = image
    // 5
    navigationItem.titleView = imageView

Answer 7

这是Swift 4.2的便捷功能，显示带有标题文本的图像：-

override func viewDidLoad() {

    super.viewDidLoad()

    //Sets the navigation title with text and image
    self.navigationItem.titleView = navTitleWithImageAndText(titleText: "Dean Stanley", imageName: "online")
}

func navTitleWithImageAndText(titleText: String, imageName: String) -> UIView {

    // Creates a new UIView
    let titleView = UIView()

    // Creates a new text label
    let label = UILabel()
    label.text = titleText
    label.sizeToFit()
    label.center = titleView.center
    label.textAlignment = NSTextAlignment.center

    // Creates the image view
    let image = UIImageView()
    image.image = UIImage(named: imageName)

    // Maintains the image's aspect ratio:
    let imageAspect = image.image!.size.width / image.image!.size.height

    // Sets the image frame so that it's immediately before the text:
    let imageX = label.frame.origin.x - label.frame.size.height * imageAspect
    let imageY = label.frame.origin.y

    let imageWidth = label.frame.size.height * imageAspect
    let imageHeight = label.frame.size.height

    image.frame = CGRect(x: imageX, y: imageY, width: imageWidth, height: imageHeight)

    image.contentMode = UIView.ContentMode.scaleAspectFit

    // Adds both the label and image view to the titleView
    titleView.addSubview(label)
    titleView.addSubview(image)

    // Sets the titleView frame to fit within the UINavigation Title
    titleView.sizeToFit()

    return titleView

}

Answer 8

让我们尝试结帐

let image = UIImage(named: "Navbar_bg.png")
navigationItem.titleView = UIImageView(image: image)
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
imageView.contentMode = .ScaleAspectFit

Answer 9

如果您更喜欢使用自动布局，并希望导航栏中有永久性固定图像，而且每个屏幕都没有动画，则此解决方案效果很好：

class CustomTitleNavigationController: UINavigationController {

override func viewDidLoad() {
    super.viewDidLoad()

    let logo = UIImage(named: "MyHeaderImage")

    let imageView = UIImageView(image:logo)
    imageView.contentMode = .scaleAspectFit
    imageView.translatesAutoresizingMaskIntoConstraints = false

    navigationBar.addSubview(imageView)

    navigationBar.addConstraint (navigationBar.leftAnchor.constraint(equalTo: imageView.leftAnchor, constant: 0))
    navigationBar.addConstraint (navigationBar.rightAnchor.constraint(equalTo: imageView.rightAnchor, constant: 0))
    navigationBar.addConstraint (navigationBar.topAnchor.constraint(equalTo: imageView.topAnchor, constant: 0))
    navigationBar.addConstraint (navigationBar.bottomAnchor.constraint(equalTo: imageView.bottomAnchor, constant: 0))
}

Answer 10

可以像这样以编程方式完成。

private var imageView: UIView {

    let bannerWidth = navigationBar.frame.size.width * 0.5 // 0.5 its multiplier to get correct image width
    let bannerHeight = navigationBar.frame.size.height

    let view = UIView()
    view.backgroundColor = .clear
    view.frame = CGRect(x: 0, y: 0, width: bannerWidth, height: bannerHeight)

    let image = UIImage(named: "your_image_name")
    let imageView = UIImageView(image: image)
    imageView.contentMode = .scaleAspectFit
    imageView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)

    view.addSubview(imageView)

    return view
}

只需更改titleView

navigationItem.titleView = imageView

Answer 11

Swift 5.1，Xcode 11

有时候，如果您的图像分辨率较高，那么imageView会偏离中心，我建议您使用此方法

  lazy var navigationTitleImageView = UIImageView()

  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    self.setNavigationBar()

    self.navigationTitleImageView.image = logo
    self.navigationTitleImageView.contentMode = .scaleAspectFit

    self.navigationTitleImageView.translatesAutoresizingMaskIntoConstraints = false

    if let navC = self.navigationController{
        navC.navigationBar.addSubview(self.navigationTitleImageView)
        self.navigationTitleImageView.centerXAnchor.constraint(equalTo: navC.navigationBar.centerXAnchor).isActive = true
        self.navigationTitleImageView.centerYAnchor.constraint(equalTo: navC.navigationBar.centerYAnchor, constant: 0).isActive = true
        self.navigationTitleImageView.widthAnchor.constraint(equalTo: navC.navigationBar.widthAnchor, multiplier: 0.2).isActive = true
        self.navigationTitleImageView.heightAnchor.constraint(equalTo: navC.navigationBar.widthAnchor, multiplier: 0.088).isActive = true
    }
}

和viewWillDisappear（）

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

或者只是减小图像尺寸

Answer 12

这对我有用...请尝试

 let image : UIImage = UIImage(named: "LogoName")
    let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
    imageView.contentMode = .scaleAspectFit
    imageView.image = image
    navigationItem.titleView = imageView

Answer 13

    let imageView = UIImageView(frame: (CGRect(x: 0, y: 0, width: 40, height: 
    40)))
    imageView.contentMode = .scaleAspectFit
    let image = UIImage (named: "logo") // logo is your NPG asset 
    imageView.image = image
    self.navigationItem.titleView = imageView

Answer 14

快速为我工作（正方形图片40x40）

let imageView = UIImageView()
        imageView.frame.size.width = 40
        imageView.frame.size.height = 40
        imageView.contentMode = .scaleAspectFit
        let image = UIImage(named: "YOUR_IMAGE_NAME")
        imageView.image = image
        navigationItem.titleView = imageView

如果您要采取其他措施，请尝试

let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 100.5)))
            imageView.contentMode = .scaleAspectFit
            let image = UIImage(named: "YOUR_IMAGE_NAME")
            imageView.image = image
            navigationItem.titleView = imageView

我希望它能为您服务。它对我有用。

Answer 15

Objective-C 版本：

NULL

以防万一有人（例如我）到达这里，在 Objective-C 中寻找答案。

Answer 16

为了获得具有适当大小且在中心的图像视图，您应该使用以下方法：

UPDATE test_table AS a
SET a.current_record = FALSE
WHERE a.id_A IN (
        SELECT id_A
        FROM Transient_Table
        )
    AND a.id_B IN (
        SELECT a.id_B PHONE_NUMBER_TYPE
        FROM Transient_Table
        );

Answer 17

我已经为iOS 10＆amp; iOS 11，它对我有用：

extension UINavigationBar {
    func setupNavigationBar() {
        let titleImageWidth = frame.size.width * 0.32
        let titleImageHeight = frame.size.height * 0.64
        var navigationBarIconimageView = UIImageView()
        if #available(iOS 11.0, *) {
            navigationBarIconimageView.widthAnchor.constraint(equalToConstant: titleImageWidth).isActive = true
            navigationBarIconimageView.heightAnchor.constraint(equalToConstant: titleImageHeight).isActive = true
        } else {
            navigationBarIconimageView = UIImageView(frame: CGRect(x: 0, y: 0, width: titleImageWidth, height: titleImageHeight))
        }
        navigationBarIconimageView.contentMode = .scaleAspectFit
        navigationBarIconimageView.image = UIImage(named: "image")
        topItem?.titleView = navigationBarIconimageView
    }
}

带有UIImage标题的导航栏

17 个答案: