標題為 UIImage 的導航欄

Question

我想通過使用徽標圖像作為導航欄的標題而不是純文本來自定義我的應用程序的外觀。 當我使用此代碼時

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

我收到錯誤“UIImage 無法轉換為 UIView”。 我怎樣才能正確地做到這一點？

Answer 1

把它放在一個UIImageView里面

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

Answer 2

我用這個。 它適用於 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)
}

這是一個如何使用 CGRect 實現的示例。

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
}

希望這會有所幫助。

Answer 3

對於 swift 4，您可以調整 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

我嘗試了上面@Jack 的回答，確實出現了徽標，但是圖像占據了整個導航欄。 我想讓它合身。

斯威夫特 4，Xcode 9.2

1.賦值給導航控制器，UIImage。 通過分割幀和圖像大小來調整大小。

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()下添加函數

    addNavBarImage()

注意圖像資產。 在上傳之前，我用額外的邊距調整了徽標，而不是在邊緣裁剪。

最后結果：

Answer 5

您可以使用自定義 UINavigationItem，因此您只需要將 Main.storyboard 上的“Navigation Item”更改為 YourCustomClass。

在斯威夫特 3

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 6

這在 2015 年 9 月對我有用 - 希望這可以幫助那里的人。

// 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

這是 Swift 4.2 的一個方便的函數，顯示帶有標題文本的圖像：-

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

斯威夫特 5.1，Xcode 11

有時，如果您的圖像是高分辨率的，則 imageView 會從中心偏移，我建議使用此方法

  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()
}

或者只是減小圖像大小

Answer 9

我已經為 iOS 10 和 iOS 11 編寫了這個，它對我有用：

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 10

如果您更喜歡使用自動布局，並希望在導航欄中有一個永久固定的圖像，並且不會在每個屏幕上都顯示動畫，則此解決方案效果很好：

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 11

讓我們試試結帳

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 12

適用於我的 swift 4（方形圖像 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，請嘗試

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

我希望它為你服務。 這個對我有用。

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

可以像這樣以編程方式完成。

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
}

只是改變titleView

navigationItem.titleView = imageView

Answer 15

這對我有用......試試吧

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 16

Objective-C版本：

//create the space for the image
UIImageView *myImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 256, 144)];
//bind the image with the ImageView allocated
myImage.image = [UIImage imageNamed:@"logo.png"];
//add image into imageview
_myNavigationItem.titleView = myImage;

以防萬一有人（像我一樣）來到這里尋找Objective-C的答案。

Answer 17

為了獲得大小合適且居中的圖像視圖，您應該使用以下方法：

let width = 120 // choose the image width
let height = 20 // choose the image height
let titleView = UIView(frame: CGRect(x: 0, y: 0, width: view.bounds.width, height: 44)) //44 is the standard size of the top bar
let imageView = UIImageView(frame: CGRect(x: (view.bounds.width - width)/2, y: (44 - height)/2, width: width, height: height))
imageView.contentMode = .scaleAspectFit //choose other if it makes sense
imageView.image = UIImage(named: "your_image_name")
titleView.addSubview(imageView)
navigationItem.titleView = titleView