Swift how to change backIndicatorImage's position and size - swift

Question

I have got this code in my AppDelegate
UINavigationBar.appearance().backIndicatorImage = #imageLiteral(resourceName: "backarrow")
And this code shows something like this
How can i resize and change the position of the image?

Answer 1

Hi you can implement it the following way: -
var backImage = UIImage(named: "backarrow")
backImage = resizeImage(image: backImage!, newWidth: 40) //the width that you want for the back button image
UINavigationBar.appearance().backIndicatorImage = backImage
And here is the image resize function
func resizeImage(image: UIImage, newWidth: CGFloat) -> UIImage? {
let scale = newWidth / image.size.width
let newHeight = image.size.height * scale
UIGraphicsBeginImageContext(CGSize(width: newWidth, height: newHeight))
image.draw(in: CGRect(x: 0, y: 0, width: newWidth, height: newHeight))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage
}

Answer 2

You have to change the button by a custom one.
Define a UIBarButtonItem and replace the default one by your custom button.
var customButton = UIBarButtonItem(image: closeButtonImage, style: .plain, target: self, action: #selector(YourController.backPressed(_:)))
self.navigationItem. backBarButtonItem = customButton

Answer 3

Just use a custom UIBarButtonItem and hide the default one.
let backButton = UIBarButtonItem(image: UIImage(named: "Your_Back_Button_Image", style: .plain, target: self, action: #selector(popCurrentViewController)
self.navigationItem.setHidesBackButton(true, animated: true)
self.navigationItem.leftBarButtonItem = backButton
To implement back functionality:
func popCurrentViewController(_ animated: Bool)
{
_ = self.navigationController?.popViewController(animated: true)
}