iOS 11自定义后退按钮问题

Question

我想在iOS 11中的这个位置按回按钮。

到目前为止我使用的代码（iOS 10）在iOS 11上不起作用。

这是一段代码：

let barBtnNeg = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.fixedSpace, target: self, action: nil)
barBtnNeg.width = -15.0
let btn: UIButton = UIButton(frame: CGRect(x: 0, y: 0, width: 30, height: 27))
btn.setBackgroundImage(UIImage(named: "BackArrow"), for: UIControlState());
// Was CustomStatusViewController Changed to ChatThreadInfoViewController
btn.addTarget(self, action: #selector(ChatThreadInfoController.backButtonAction(_:)), for: UIControlEvents.touchUpInside)
let barBtnBack = UIBarButtonItem(customView: btn)
self.navigationItem.leftBarButtonItems = [barBtnNeg, barBtnBack]

我在iOS 11中使用的代码：

let view = UIView()
view.frame = CGRect(x: 0, y: 0, width: 40, height: 27)
let btn: UIButton = UIButton(frame: CGRect(x:-14, y: 0, width: 30, height: 27))
btn.setBackgroundImage(UIImage(named: "BackArrow"), for: UIControlState());
btn.addTarget(self, action: #selector(RoomMessageController.leftNavBackButtonPressed(_:)), for: UIControlEvents.touchUpInside)
btn.center = CGPoint(x: btn.center.x,y :view.center.y)
let tap = UITapGestureRecognizer(target: self, action: #selector(RoomMessageController.leftNavBackButtonPressed(_:)))
view.addGestureRecognizer(tap)
view.isUserInteractionEnabled = true
view.addSubview(btn)
let leftButtonItem = UIBarButtonItem(customView: view)
//add view to nav bar
self.navigationItem.leftBarButtonItem = leftButtonItem

问题是在iOS 11中有时使用上面的代码我无法正确点击按钮而我无法使用默认后退按钮，因为我需要自定义操作？

Answer 1

根据您的问题，您只需要显示自定义图像而不是默认后退按钮。所以我建议您使用简单的UIBarButtonItem初始化程序：

let backItem = UIBarButtonItem(image: UIImage(named: "BackArrow"), 
                               style: .plain, 
                               target: self, 
                               action: #selector(ChatThreadInfoController.backButtonAction(_:)))
self.navigationItem.leftBarButtonItem = backItem

此按钮将使用正确的框架，因此您不会遇到任何点击问题。