iOS - add image and text in title of Navigation ba

问题:

I would like to create a nav bar similar to what's in the image that's attached.

The title of the nav bar will be a combination of an image and text.

1. Should this be done per any best practice?

2. How can it be done?

回答1:

As this answer shows, the easiest solution is to add the text to your image and add that image to the navigation bar like so:

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

But if you have to add text and an image separately (for example, in the case of localization), you can set your navigation bar's title view to contain both image and text by adding them to a UIView and setting the navigationItem's title view to that UIView, for example (assuming the navigation bar is part of a navigation controller):

// Only execute the code if there's a navigation controller 
if self.navigationController == nil {
    return
}

// Create a navView to add to the navigation bar
let navView = UIView()

// Create the label
let label = UILabel()
label.text = "Text"
label.sizeToFit()
label.center = navView.center
label.textAlignment = NSTextAlignment.Center

// Create the image view
let image = UIImageView()
image.image = UIImage(named: "Image.png")
// To maintain the image's aspect ratio:
let imageAspect = image.image!.size.width/image.image!.size.height
// Setting the image frame so that it's immediately before the text:
image.frame = CGRect(x: label.frame.origin.x-label.frame.size.height*imageAspect, y: label.frame.origin.y, width: label.frame.size.height*imageAspect, height: label.frame.size.height)
image.contentMode = UIViewContentMode.ScaleAspectFit

// Add both the label and image view to the navView
navView.addSubview(label)
navView.addSubview(image)

// Set the navigation bar's navigation item's titleView to the navView
self.navigationItem.titleView = navView

// Set the navView's frame to fit within the titleView
navView.sizeToFit()

回答2:

Use horizontal UIStackView should be much cleaner and easier

Please add the next extension to UIViewController

extension UIViewController {
    func setTitle(_ title: String, andImage image: UIImage) {
        let titleLbl = UILabel()
        titleLbl.text = title
        titleLbl.textColor = UIColor.white
        titleLbl.font = UIFont.systemFont(ofSize: 20.0, weight: .bold)
        let imageView = UIImageView(image: image)
        let titleView = UIStackView(arrangedSubviews: [imageView, titleLbl])
        titleView.axis = .horizontal
        titleView.spacing = 10.0
        navigationItem.titleView = titleView
    }
}

then use it inside your viewController:

setTitle("yourTitle", andImage: UIImage(named: "yourImage"))

(this will align the text and the icon together to the center, if you want the text to be centered and the icon in the left, just add an empty UIView with width constraint equal to the icon width)

回答3:

here is my 2 cents for Swift 4, since accepted answer didn't work for me (was mostly off the screen):

// .. in ViewController
var navBar = CustomTitleView()

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


    // =================== navBar =====================
    navBar.loadWith(title: "Budget Overview", leftImage: Images.pie_chart)
    self.navigationItem.titleView = navBar

}

class CustomTitleView: UIView
{

var title_label = CustomLabel()
var left_imageView = UIImageView()

override init(frame: CGRect){
    super.init(frame: frame)
    setup()
}

required init?(coder aDecoder: NSCoder){
    super.init(coder: aDecoder)
    setup()
}

func setup(){
    self.addSubview(title_label)
    self.addSubview(left_imageView)

}

func loadWith(title: String, leftImage: UIImage?)
{

    //self.backgroundColor = .yellow

    // =================== title_label ==================
    //title_label.backgroundColor = .blue
    title_label.text = title
    title_label.font = UIFont.systemFont(ofSize: FontManager.fontSize + 5)


    // =================== imageView ===================
    left_imageView.image = leftImage

    setupFrames()
}

func setupFrames()
{

    let height: CGFloat = Navigation.topViewController()?.navigationController?.navigationBar.frame.height ?? 44
    let image_size: CGFloat = height * 0.8

    left_imageView.frame = CGRect(x: 0,
                                  y: (height - image_size) / 2,
                                  width: (left_imageView.image == nil) ? 0 : image_size,
                                  height: image_size)

    let titleWidth: CGFloat = title_label.intrinsicContentSize.width + 10
    title_label.frame = CGRect(x: left_imageView.frame.maxX + 5,
                               y: 0,
                               width: titleWidth,
                               height: height)



    contentWidth = Int(left_imageView.frame.width)
    self.frame = CGRect(x: 0, y: 0, width: CGFloat(contentWidth), height: height)
}


var contentWidth: Int = 0 //if its CGFloat, it infinitely calls layoutSubviews(), changing franction of a width 
override func layoutSubviews() {
    super.layoutSubviews()

    self.frame.size.width = CGFloat(contentWidth)

}

}

回答4:

// worked for me

1. create a view and set the frame
2. now add the image in the view and set the frame
3. after adding the image, add the label in same view and set the frame

4. after adding the image and label to view, add same view to navigationItem

   let navigationView = UIView(frame: CGRect(x: 0, y: 0, width: 50 , height: 55))

   let labell : UILabel = UILabel(frame: CGRect(x: -38, y: 25, width: 150, height: 25))
   labell.text = "Your text"
   labell.textColor = UIColor.black
   labell.font = UIFont.boldSystemFont(ofSize: 10)
   navigationView.addSubview(labell)
   
   let image : UIImage = UIImage(named: ValidationMessage.headerLogoName)!
   let imageView = UIImageView(frame: CGRect(x: -20, y: 0, width: 100, height: 30))
   imageView.contentMode = .scaleAspectFit
   imageView.image = image
   //navigationItem.titleView = imageView
   
   navigationView.addSubview(imageView)
   
   navigationItem.titleView = navigationView