I have an app with several ViewControllers, and I have to display an image in the title of the navigation bar, I already have this code to do it.
public func carregarLogoNav() -> Void {
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 86, height: 38))
imageView.contentMode = .scaleAspectFit
let image = UIImage(named: "logo-simples.png")
imageView.image = image
navigationItem.titleView = imageView
}
But I would like to know if it is possible to replicate this image to all other views, without having to paste this code in each one.
Another way would be to just call this function in another ViewController, but it is not working either
anotherViewController().carregarLogoNav()
If you wish to have the same titleView in all of your view controllers then you can put your carregarLogoNav function in an extension and then call it from viewDidLoad of each of your view controllers:
extension UIViewController {
public func setupCarregarLogoNav() {
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 86, height: 38))
imageView.contentMode = .scaleAspectFit
let image = UIImage(named: "logo-simples.png")
imageView.image = image
navigationItem.titleView = imageView
}
}
Then in each view controller:
override func viewDidLoad() {
super.viewDidLoad()
setupCarregarLogoNav()
// any other code
}
This way your setup code is only in once place. It's just called from other places.
Related
I am able to set system image as a button icon and add subviews under views but whatever I try, UIImageView never renders a system image. What am I doing wrong?
override func viewDidLoad() {
super.viewDidLoad()
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
imageView.image = UIImage(named: "pencil")
imageView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(imageView)
}
You should use UIImage(systemName: "pencil") initializer instead of UIImage(named: "pencil") in order to use images from SFSymbols. You can read more about it here.
I am a Swift newbie and I am trying to add an UIImageView on the right of UITextField using Storyboard and #IBInspectable annotation.
However, when I define my UIImageView with specific size and add the UIImage, the UIImage is not resizing according to UIImageView size.
Here's my code:
#IBInspectable var rightImage: UIImage? {
didSet {
guard let image = rightImage else {
return
}
rightViewMode = .always
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
imageView.image = image
imageView.contentMode = .scaleAspectFit
rightView = imageView
and here's the result on the screen:
Big big icon
If you can tell me what is wrong with my code, do not hesitate.
Thanks.
I use constraints based on Matt’s suggestion in the comment, and it's working now:
let constraints = [
imageView.heightAnchor.constraint(equalToConstant: 20),
imageView.widthAnchor.constraint(equalToConstant: 20)
]
NSLayoutConstraint.activate(constraints)
I have the following function I use to customize the navigation bar across almost all the apps view controllers and table view controllers - instead of replicating the code numerous times I am looking for way to easily call the function on those view controllers needing it.
I have tried wrapping in extension UIViewController { } but run into a selector issue saying the following:
Argument of '#selector' cannot refer to local function
'Tapped(tapGestureRecognizer:)'
Code:
func navBar(){
// Profile Image
let containView = UIView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
imageView.image = UIImage(url: URL(string: "test.com"))
imageView.contentMode = UIView.ContentMode.scaleAspectFit
imageView.layer.cornerRadius = 20
imageView.layer.masksToBounds = true
containView.addSubview(imageView)
let rightBarButton = UIBarButtonItem(customView: containView)
self.navigationItem.rightBarButtonItem = rightBarButton
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(imageTapped(tapGestureRecognizer:)))
imageView.isUserInteractionEnabled = true
imageView.addGestureRecognizer(tapGestureRecognizer)
}
#objc func imageTapped(tapGestureRecognizer: UITapGestureRecognizer) {
print("Profile Tapped")
}
How can this UIImage be seen in the navigation bar across various view controller without needing to rewrite the same code across all.
Lot a way to do it. I'll usually istance and personalize an UIViewController and use it around the whole app.
class baseController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//call your navBar here
navbar()
}
func navBar(){
// Profile Image
let containView = UIView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
imageView.image = UIImage(url: URL(string: "test.com"))
imageView.contentMode = UIView.ContentMode.scaleAspectFit
imageView.layer.cornerRadius = 20
imageView.layer.masksToBounds = true
containView.addSubview(imageView)
let rightBarButton = UIBarButtonItem(customView: containView)
self.navigationItem.rightBarButtonItem = rightBarButton
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(imageTapped(tapGestureRecognizer:)))
imageView.isUserInteractionEnabled = true
imageView.addGestureRecognizer(tapGestureRecognizer)
}
}
Now instance this class whenever you want and your controller will get your navBar() every time with this
class mineController:baseController {
//your code here...
}
I'm trying to add a logo to my page's navigation bar, however it doesn't appear when I added this code to my viewDidLoad():
let logo = UIImage(named: "Dog_Log_Icon_H_W")
let imageView = UIImageView(image:logo)
self.navigationItem.titleView = imageView
Does anybody know why this might not be working? I checked that the image name is correct. This is my storyboard if it helps:
So it worked when I made an outlet,
#IBOutlet weak var navItem: UINavigationItem!
then put the following code in my viewDidAppear:
let logo = UIImage(named: "Dog_Log_Icon_4"){
let imageView = UIImageView(image:logo)
imageView.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
navItem.titleView = imageView
not sure why I had to do that..
The reason is because you forgot set the position for the imageView.
You can change your code like this:
let logo = UIImage(named: "Dog_Log_Icon_H_W")
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 30, height: 30)
imageView.image = logo
self.navigationItem.titleView = imageView
You have not set the frame of the image view. I have set frame of the image view and it works fine.
if let logo = UIImage(named: "download"){
let imageView = UIImageView(image:logo)
imageView.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
self.navigationItem.titleView = imageView
}else{
print("Image not found...")
}
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.
Should this be done per any best practice?
How can it be done?
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()
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)
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)
}
}
Swift 4.2 + Interface Builder Solution
As a follow-on to Lyndsey Scott's answer, you can also create a UIView .xib in Interface Builder, use that to lay out your title and image, and then update it on-the-fly via an #IBOutlet. This is useful for dynamic content, internationalization, maintainability etc.
Create a UIView subclass with a UILabel outlet and assign your new .xib to this class:
import UIKit
class FolderTitleView: UIView {
#IBOutlet weak var title : UILabel!
/// Create an instance of the class from its .xib
class func instanceFromNib() -> FolderTitleView {
return UINib(nibName: "FolderTitleView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! FolderTitleView
}
}
Connect the label to your outlet (title in my example) in your .xib, then in your UIViewController:
/// Reference to the title view
var folderTitleView : FolderTitleView?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Set the screen title to match the active folder
updateTitle()
}
/// Updates the title of the navigation controller.
func updateTitle() {
self.title = ""
if folderTitleView == nil {
folderTitleView = FolderTitleView.instanceFromNib()
self.navigationItem.titleView = folderTitleView
}
folderTitleView!.title.text = "Listening"
folderTitleView!.layoutIfNeeded()
}
This results in a nice self-centering title bar with an embedded image that you can easily update from code.
// worked for me
create a view and set the frame
now add the image in the view and set the frame
after adding the image, add the label in same view and set the frame
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