Question

它工作正常，直到最近的更新，我认为导航项应该与AutoLayout概念一起使用。我一直在用它：

let button = UIButton(frame: CGRect(origin: CGPoint.zero, size: CGSize(width: 30, height: 30)))
button.setImage(UIImage(named: "BackIcon"), for: UIControlState())
button.imageEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0)
button.addTarget((target != nil ? target! : self), action: backAction, for: .touchUpInside)
navigationItem.leftBarButtonItem = UIBarButtonItem(customView: button)

我应该做些什么改变才能使它平滑，因为它不会在每次敲击时被调用，通常需要2-3次才能在同一区域内进行调整。

Answer 1

这适用于iOS 11.检查并查看它是否适合您。

    let btnLeftMenu = UIButton.init(type: .system)
    let image = UIImage(named: "Back");
    btnLeftMenu.setImage(image, for: .normal)
    btnLeftMenu.setTitle("BACK", for: .normal);
    btnLeftMenu.imageEdgeInsets = UIEdgeInsetsMake(0, -30, 0, 0)
    btnLeftMenu.titleEdgeInsets = UIEdgeInsetsMake(0, -30, 0, 0)
    btnLeftMenu.sizeToFit()
    btnLeftMenu.tintColor = UIColor.white
    btnLeftMenu.titleLabel?.font = UIFont.init(name: "Avenir-Heavy", size: 16.0)
    btnLeftMenu.addTarget(self, action: #selector (CustomMessageVC.backButtonAction(_:)), for: .touchUpInside)
    let barButton = UIBarButtonItem(customView: btnLeftMenu)
    self.navigationItem.leftBarButtonItem = barButton

[编辑]

图像的宽度和高度可能很小。您可以使用Xcode调试上的实时Viewstack检查后退按钮的宽度和高度。单击图像右侧的第二个按钮以查看ViewStack。如果宽度和高度是问题，则增加按钮宽度和高度，图像居中，imageView属性适合纵横比。这应该可以解决你的问题。快乐的编码。

Answer 2

适合我：

let backButton = UIBarButtonItem(title: "Back",
            style: .done,
            target: self,
            action: #selector(moveBack))
navigationItem.setLeftBarButton(backButton, animated: false)

打开视图调试器并检查leftBarButtonItem的框架。您应该对leftBarButton小心，因为它不会从UIView继承并在运行时生成帧。

Answer 3

在我们的应用程序中发现了这个问题，因为iOS 11已经出局了，所以这是我的解决方案。它并不完美，因为你需要设置按钮的框架，但是完成工作，并且可以在iOS 9.3 / 10.3.1 / 11.1上工作（可能在两者之间）。 Tap区域正常，UX很好。

<强>之前：

<强>后：

我在viewDidLoad中调用它：

func setNavbarButtons() {
    // setup the left and right nav bar buttons

    // manually define the frame for the buttons
    let buttonWidth: CGFloat  = 44
    var buttonHeight: CGFloat = buttonWidth

    // if possible, use the nav bar height as the button height, else fall back to the manual value above
    if let frame = self.navigationController?.navigationBar.frame {
        buttonHeight = frame.height
    }

    // apply this to the left inset for the left button, right inset for the right button, so the image is pushed to the left/right respectively
    // (hence the negative value)
    // setting this to 0 will center the image in the button and we don't want that
    let edgeInset = -(buttonWidth/2)

    // setup a button to hold the image (left)
    let leftButton = UIButton(type: .custom)
    let backIcon = UIImage(named: "Back with shadow")
    backIcon!.isAccessibilityElement = true
    backIcon!.accessibilityLabel = "Back"

    // no title text
    leftButton.setTitle("", for: .normal)
    leftButton.setImage(backIcon, for: .normal)
    leftButton.sizeToFit()
    leftButton.addTarget(self, action: #selector(self.didTapLeftNavbarButton), for: .touchUpInside)

    // define left button frame and inset
    leftButton.frame.size.width = buttonWidth
    leftButton.frame.size.height = buttonHeight
    leftButton.contentEdgeInsets = UIEdgeInsetsMake(0, edgeInset, 0, 0)

    // finally setup a UIBarButtonItem to hold the UIButton (arg)
    let leftBarButtonItem = UIBarButtonItem(customView: leftButton)
    leftBarButtonItem.title = ""

    // set it
    self.navigationItem.setLeftBarButton(leftBarButtonItem, animated: true)

    // rinse/wash/repeat for right button
    let rightButton = UIButton(type: .custom)
    let shareIcon = UIImage(named: "Share")
    shareIcon!.isAccessibilityElement = true
    shareIcon!.accessibilityLabel = "Share"

    // no title text
    rightButton.setTitle("", for: .normal)
    rightButton.setImage(shareIcon, for: .normal)
    rightButton.sizeToFit()
    rightButton.addTarget(self, action: #selector(self.didTapActionButton(_:)), for: .touchUpInside)

    // define right button frame and inset
    rightButton.frame.size.width = buttonWidth
    rightButton.frame.size.height = buttonHeight
    rightButton.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, edgeInset)

    let rightBarButtonItem = UIBarButtonItem(customView: rightButton)
    rightBarButtonItem.title = ""

    self.navigationItem.setRightBarButton(rightBarButtonItem, animated: true)
}

Answer 4

在我的自定义public IList<Models.MyModel> GetDaraByPId(Guid PId) { var query = this._Repository.GetIQueryable(); var list = query.Select(a => new Models.MyModel { MyModelId = a.Id, MyModelName = a.Name, PId=a.PId }).Where(f => f.PId == PId); return list.ToList(); }课程中覆盖以下方法对我来说很有用：

UIView

导航栏中的后退按钮未在ios 11中点击

4 个答案: