I am trying to use Swift's internal back button image. I have asked this question before and got the technically correct answer that it inherits it from the previous View, BUT if I insert this code you can control the back button on the current View.
// Takeover Back Button
self.navigationItem.hidesBackButton = false
let newBackButton = UIBarButtonItem(title: "<", style: .Plain, target: self, action: "segueBack")
navigationItem.leftBarButtonItem = newBackButton
That gives me a <, "ABC" would give me ABC etc but how do I trigger Swift to put up it's internal Back Button image. The code below doesn't work but I would have thought is along the right lines.
let backImg: UIImage = UIImage(named: "BACK_BUTTON_DEFAULT_ICON")!
navigationItem.leftBarButtonItem!.setBackgroundImage(backImg, forState: .Normal, barMetrics: .Default)
Has anyone worked out how to do this?
Try to add custom view as back button like as
var backButton = UIButton(frame: CGRectMake(0, 0, 70.0, 70.0))
var backImage = UIImage(named: "backBtn")
backButton.setImage(backImage, forState: UIControlState.Normal)
backButton.titleEdgeInsets = UIEdgeInsetsMake(10.0, 10.0, 10.0, 0.0)
backButton.setTitle("Back", forState: UIControlState.Normal)
backButton.addTarget(self, action: "buttonPressed", forControlEvents: UIControlEvents.TouchUpInside)
var backBarButton = UIBarButtonItem(customView: backButton)
var spacer = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FixedSpace, target: nil, action: nil)
spacer.width = -15
self.navigationItem.leftBarButtonItems = [spacer,backBarButton]
It will look same as iOS back button
I struggled with this question for a while. Finally I got the back image with the following code:
let backImage = navigationController?.navigationBar.subviews[2].subviews[0].subviews[0].subviews[0] as! UIImageView).image
Before run the code above, make sure the back button is showing. Then you can save backImage
to anywhere you want.
Here is the backImage I got.
Here is my solution:
override func viewDidLoad() {
...
let buttonBack = UIBarButtonItem(image: UIImage(named: "backButton"), style: .plain, target: self, action: #selector(buttonSavePressed(_:)))
self.navigationItem.leftBarButtonItem = buttonBack
let backButton = UIButton(frame: CGRect(x: 0, y: 0, width: 24.0, height: 24.0))
let backImage = UIImage(named: "backButton")
backButton.setImage(backImage, for: .normal)
backButton.setTitle("Back", for:.normal)
if #available(iOS 13.0, *) {
backButton.setTitleColor(.link, for: .normal)
} else {
backButton.setTitleColor(.blue, for: .normal)
}
backButton.addTarget(self, action:#selector(buttonSavePressed(_:)), for: .touchUpInside)
let backBarButton = UIBarButtonItem(customView: backButton)
let spacer = UIBarButtonItem(barButtonSystemItem: .fixedSpace, target: nil, action: nil)
spacer.width = -15
self.navigationItem.leftBarButtonItems = [spacer,backBarButton]
}
@objc func buttonBackPressed(_ sender: Any) {
...
}
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