ios - 无法以编程方式在 Swift 导航栏上生成 "< Back"

Question

首先让我说我正在以编程方式完成所有编码。我的问题是我无法在导航栏中生成经典的 iOS“

这是我用来创建导航栏的函数:

// Makes a navigation Bar
func makeNavigationBar(navigationBar: UINavigationBar, barTitle: String, forwardButton: Bool, backButton: Bool, page: UIViewController){
  // Create a navigation item with a title
  let navigationItem = UINavigationItem()
  navigationItem.title = barTitle

  // Create left navigation item
  if(backButton){
    let leftButton =  UIBarButtonItem(title: "Back", style:   UIBarButtonItemStyle.Plain, target: page, action: "backClicked:")
    // Create two buttons for the navigation item
    navigationItem.leftBarButtonItem = leftButton
  }
  if(forwardButton){
    let rightButton =  UIBarButtonItem(title: "Next", style:   UIBarButtonItemStyle.Plain, target: page, action: "nextClickedClicked:")
    // Create two buttons for the navigation item
    navigationItem.rightBarButtonItem = rightButton
  }
  // Assign the navigation item to the navigation bar
  navigationBar.items = [navigationItem]
  //Adds the bar to the view
  page.view.addSubview(navigationBar)
}

这是我对该函数的调用:

let navigationBar = UINavigationBar(frame: CGRectMake(0, 0, self.view.frame.size.width, height/12)) 
creationFunctions.makeNavigationBar(navigationBar, barTitle: "", forwardButton: false, backButton: true, page: self)

这是“backClicked”函数:

func backClicked (sender: UIBarButtonItem!){
    self.dismissViewControllerAnimated(true, completion: {});
}

感谢您的帮助。

Answer 1

您好，这是创建自定义后退按钮并将其添加到 navigationController 的代码。我的 ViewController 类中有这些方法。

func addBackButton() {
    let image = UIImage(named: "BackImage")!.imageWithRenderingMode(.AlwaysOriginal)
    self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style: .Plain, target: self, action: "backClicked:")
}

func backClicked (sender: UIBarButtonItem!){
    self.dismissViewControllerAnimated(true, nil);
}

希望对你有帮助