Swift - Help Converting from Objective C Syntax - ios

Question

I'm trying to replace the UINavigationController BackBarButtonItem with a custom image, and I would like there to be no back icon like it's currently doing here:
I'm taking this picture from another stack post, but something similar is happening with mine
The solution to this was listed here: Remove back arrow in iOS7
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"back-btn"]
style:UIBarButtonItemStylePlain
target:nil
action:nil];
if ([UINavigationBar instancesRespondToSelector:#selector(setBackIndicatorImage:)]) {
[[UINavigationBar appearance] setBackIndicatorImage:[[UIImage alloc] init]];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[[UIImage alloc] init]];
}
The problem is I'm having trouble converting this code to Swift. If anybody could help me that would be greatly appreciated. Thanks in advance!

Answer 1

For getting swipe back feature :
First set delegate in viewDidLoad:
self.navigationController!.interactivePopGestureRecognizer.delegate = self
And then disable gesture when pushing:
override func pushViewController(_ viewController: UIViewController, animated: Bool) {
super.pushViewController(viewController, animated: animated)
self.interactivePopGestureRecognizer.isEnabled = false
}
And enable in viewDidDisappear:
self.navigationController!.interactivePopGestureRecognizer.isEnabled = true

Answer 2

Use below code:
//Hide Default Back Button First
self.navigationItem.setHidesBackButton(true, animated:true);
//Your code to show back button
let backButton = UIButton()
backButton.setImage(UIImage(named: "imagename"), forState: .Normal)
backButton.frame = CGRectMake(0, 0, 30, 30)
backButton.addTarget(self, action: Selector("action"), forControlEvents: .TouchUpInside)
let rightBarButton = UIBarButtonItem()
rightBarButton.customView = backButton
self.navigationItem.leftBarButtonItem = rightBarButton
//Back Button Action
func action()
{
self.navigationController?.popViewControllerAnimated(true)
}
Or you can refer one of the answer

Answer 3

Use following code in swift 2.2 (xocde 7.3) :
class BaseViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.setBackButton()
}
func setBackButton() {
let backImage = UIImage(named:"back_icon") as UIImage!
let backButton = UIBarButtonItem(image: backImage, style:UIBarButtonItemStyle.Plain, target: self, action: #selector(BaseViewController.viewWillDisappearC) )
self.navigationItem.leftBarButtonItem = backButton
}
func viewWillDisappearC() {
self.navigationController?.popViewControllerAnimated(true)
}
}

Answer 4

Use following code in swift 3 :
class BaseViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.setBackButton()
}
func setBackButton() {
let backImage = UIImage(named:"back_icon") as UIImage!
let backButton = UIBarButtonItem(image: backImage, style: UIBarButtonItemStyle.plain, target: self, action: #selector(BaseViewController.viewWillDisappearC) )
self.navigationItem.leftBarButtonItem = backButton
}
func viewWillDisappearC() {
_ = self.navigationController?.popViewController(animated: true)
}
}