带有UIImage标题的导航栏

Question

我想通过使用徽标图像作为导航栏的标题来自定义我的应用程序的外观，而不是纯文本。当我使用此代码时

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

我收到错误“UIImage无法转换为UIView”。我该怎么做才能正确？

Answer 1

把它放在UIImageView里面

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

Answer 2

我已经为iOS 10和iOS 11编写了这个，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
    }
}

Answer 3

适用于我的快速4（方形图像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

如果您想要其他措施，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

我希望它能为你服务。这个对我有用。

Answer 4

这对我有用......试试吧

 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 5

    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 6

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)
}

以下是如何使用CGRect完成此操作的示例。

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 7

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 8

您可以使用自定义UINavigationItem，因此您只需要在Main.storyboard上将“Navigation Item”更改为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 9

我试过上面@ Jack的答案，但是徽标确实出现了，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赋值。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
    }

2. 在viewDidLoad()下添加函数 addNavBarImage()

关于图像资产的注意事项。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。

最后结果：

Answer 10

这在2015年9月对我有用 - 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 11

这是Swift 4.2的一个方便的功能，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 12

如果您更喜欢使用自动布局，并希望导航栏中的永久固定图像不会在每个屏幕中生成动画，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 13

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