Ios Xcode 7.3.1：将背景图像设置为UINavigationBar并显示后退按钮

我想将应用程序的徽标作为背景图像设置为

UINavigationBar

，当用户进入应用程序时，它应该显示徽标以及顶部的后退按钮。

下面是我使用的代码：

 func setNavigationBar() {
        let navigationBarHeight: CGFloat = self.navigationController!.navigationBar.frame.height
        let screenSize: CGRect = UIScreen.mainScreen().bounds

        let objCustomView = CustomView(frame: CGRect(x: 0, y: 0, width: screenSize.width, height: navigationBarHeight))

        let objWindow = UIApplication.sharedApplication().keyWindow
        objWindow?.addSubview(objCustomView)

        self.navigationItem.setHidesBackButton(false, animated:true);
        self.navigationItem.backBarButtonItem = UIBarButtonItem(title:"", style:.Plain, target:nil, action:nil)                
    }

问题是后退按钮位于图像后面。

如何解决此问题？

通过@NDoc引用帖子后，我在左边得到了额外的空间。为什么会这样？ 此外，后退按钮应为白色，没有后退文本，即只有<箭头

以下是customView的代码：

class CustomView: UIView {      
    var imgLogo = UIImageView(frame:CGRectZero)

    override init(frame: CGRect) {
        super.init(frame: frame)

        let screenSize: CGRect = UIScreen.mainScreen().bounds        
        imgLogo.frame = CGRectMake(0, 0, screenSize.width, 44.0)

        setup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        setup()
    }

    func setup() {
        imgLogo.image = UIImage(named:"BoM_Logo")
        self.addSubview(imgLogo)
    }
}

---

您可以在

leftBarButtonItem

中显示您的徽标，并将

leftItemsSupportElementBackButton

设置为

true

以显示

backButton

let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let item = UIBarButtonItem(customView: logoView)
self.navigationItem.leftBarButtonItem = item

let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let logoItem = UIBarButtonItem(customView: logoView)
let btnBack = UIButton(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
btnBack.setImage(UIImage(named: "Back_Arrow"), forState: .Normal)
btnBack.addTarget(self, action: #selector(self.buttonAction(_:)), forControlEvents: .TouchUpInside)
let backItem = UIBarButtonItem(customView: btnBack)     
self.navigationItem.leftBarButtonItems = [backItem, logoItem]

要显示带有徽标图像的后退按钮，请将

leftitemsupplementbackbutton

设置为

true

self.navigationItem.leftItemsSupplementBackButton = true

编辑：

如果需要自定义箭头，则需要使用

leftBarButtonItems

并传递

BarButtonItem

的数组，而不需要像这样将

leftItemsSupportBackButton

设置为

true

let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let item = UIBarButtonItem(customView: logoView)
self.navigationItem.leftBarButtonItem = item

let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let logoItem = UIBarButtonItem(customView: logoView)
let btnBack = UIButton(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
btnBack.setImage(UIImage(named: "Back_Arrow"), forState: .Normal)
btnBack.addTarget(self, action: #selector(self.buttonAction(_:)), forControlEvents: .TouchUpInside)
let backItem = UIBarButtonItem(customView: btnBack)     
self.navigationItem.leftBarButtonItems = [backItem, logoItem]

---

注意：别忘了在viewController中添加

按钮操作

操作方法。

您可以在

leftBarButtonItem

中显示您的徽标，并将

leftItemsSupplementBackButton

设置为

true

，以显示

backButton

，如下所示

let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let item = UIBarButtonItem(customView: logoView)
self.navigationItem.leftBarButtonItem = item

let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let logoItem = UIBarButtonItem(customView: logoView)
let btnBack = UIButton(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
btnBack.setImage(UIImage(named: "Back_Arrow"), forState: .Normal)
btnBack.addTarget(self, action: #selector(self.buttonAction(_:)), forControlEvents: .TouchUpInside)
let backItem = UIBarButtonItem(customView: btnBack)     
self.navigationItem.leftBarButtonItems = [backItem, logoItem]

要显示带有徽标图像的后退按钮，请将

leftitemsupplementbackbutton

设置为

true

self.navigationItem.leftItemsSupplementBackButton = true

编辑：

如果需要自定义箭头，则需要使用

leftBarButtonItems

并传递

BarButtonItem

的数组，而不需要像这样将

leftItemsSupportBackButton

设置为

true

let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let item = UIBarButtonItem(customView: logoView)
self.navigationItem.leftBarButtonItem = item

let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let logoItem = UIBarButtonItem(customView: logoView)
let btnBack = UIButton(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
btnBack.setImage(UIImage(named: "Back_Arrow"), forState: .Normal)
btnBack.addTarget(self, action: #selector(self.buttonAction(_:)), forControlEvents: .TouchUpInside)
let backItem = UIBarButtonItem(customView: btnBack)     
self.navigationItem.leftBarButtonItems = [backItem, logoItem]

---

注意：不要忘记在viewController中添加

按钮操作

操作方法。

在appDelegate中尝试此操作

let image = UIImage.init(named:"upper-bar.png")
UINavigationBar.appearance().setBackgroundImage(image,forBarMetrics:UIBarMetrics.Default)

对于“后退”按钮，请在viewController的viewDidLoad（）中尝试此操作

let image1 = UIImage(named: "go10.png") as UIImage?
let btnLeft = UIButton(type: .Custom)
btnLeft.frame = CGRectMake(0, 0, 25, 25)
btnLeft.setImage(image1,forState:UIControlState.Normal)
btnLeft.addTarget(self, action:(#selector(NameofyourViewController.backBtn(_:))),forControlEvents:UIControlEvents.TouchUpInside)

let leftBarButton = UIBarButtonItem(customView: btnLeft)
self.navigationItem.leftBarButtonItem = leftBarButton
@IBAction func backBtn(sender: UIButton)
{
    self.navigationController?.popViewControllerAnimated(true)
}

---

在你的appDelegate中试试这个

let image = UIImage.init(named:"upper-bar.png")
UINavigationBar.appearance().setBackgroundImage(image,forBarMetrics:UIBarMetrics.Default)

对于“后退”按钮，请在viewController的viewDidLoad（）中尝试此操作

let image1 = UIImage(named: "go10.png") as UIImage?
let btnLeft = UIButton(type: .Custom)
btnLeft.frame = CGRectMake(0, 0, 25, 25)
btnLeft.setImage(image1,forState:UIControlState.Normal)
btnLeft.addTarget(self, action:(#selector(NameofyourViewController.backBtn(_:))),forControlEvents:UIControlEvents.TouchUpInside)

let leftBarButton = UIBarButtonItem(customView: btnLeft)
self.navigationItem.leftBarButtonItem = leftBarButton
@IBAction func backBtn(sender: UIButton)
{
    self.navigationController?.popViewControllerAnimated(true)
}

---

请检查问题。我使用此代码还有一个问题，请检查问题。使用此代码还有一个问题