设置导航backBarButtonItem以转到Swift中的特定UIViewController

Question

我需要导航的后退按钮始终弹出特定的UIViewController。

override func viewDidLoad() {
    super.viewDidLoad()

    //set title image
    var logoImage:UIImage = UIImage(named: "barra")!
    var logoImageView : UIImageView = UIImageView(image: logoImage)
    logoImageView.frame = CGRectMake(0, 0, 320, 44)
    logoImageView.contentMode = .ScaleAspectFit
    logoImageView.contentMode = UIViewContentMode.Center
    logoImageView.clipsToBounds = true
    self.navigationItem.titleView = logoImageView

    //set back image
    var backImage:UIImage = UIImage(named: "freccia")!
    backImage = backImage.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
    self.navigationItem.backBarButtonItem = UIBarButtonItem(title:"", style: .Plain,target: self, action: "goToServizi:")
    self.navigationController!.navigationBar.backIndicatorImage = backImage
    self.navigationController!.navigationBar.backIndicatorTransitionMaskImage = backImage

    //set menu image
    var menuImage:UIImage = UIImage(named: "menu")!
    menuImage = menuImage.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
    self.navigationItem.rightBarButtonItem?.image = menuImage

}

func goToServizi(sender: UIBarButtonItem)
{
    self.navigationController?.popToViewController(ServiziVC(), animated: true)// here I add a breakpoint, but it is never executed.
}

ServiziVC是我每次单击“后退”按钮时需要显示的UIViewController。

我无法理解为什么没有调用goToServizi func。请帮忙。

谢谢。

Answer 1

以下是您的示例。

import UIKit

class SecondViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    //Customise your barButton Like this
    var backImage:UIImage = UIImage(named: "freccia")!
    backImage = backImage.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
    var backButton = UIBarButtonItem(image: backImage, style: UIBarButtonItemStyle.Bordered, target: self, action: "goToThird")
    self.navigationItem.leftBarButtonItem = backButton
}

func goToThird(){

    //Initiate newViewController this way
    let ThirdView = self.storyboard?.instantiateViewControllerWithIdentifier("ThirdViewController") as ThirdViewController

    self.navigationController?.pushViewController(ThirdView, animated: true)
    }
}

修改

单击要使用标识符启动的ViewController，您可以在Identity Inspector中找到StoryBoard ID，如下图所示。

HERE是您的示例，供您参考。

根据您的需要修改代码。可能会对您有帮助。

Answer 2

self.navigationController？.popToViewController（ServiziVC（），animated：true）你不能像这样自定义后退按钮动作。这有效：

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.hidesBackButton = true;
    var backImage:UIImage = UIImage(named: "freccia")!
    backImage = backImage.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
    var fakeBackButton = UIBarButtonItem(image: backImage, style: UIBarButtonItemStyle.Bordered, target: self, action: "goToServizi:")
    self.navigationItem.leftBarButtonItem = fakeBackButton;
}

func goToServizi(sender: UIBarButtonItem)
{
    self.navigationController?.popToViewController(ServiziVC(), animated: true)
}

或者，您可以覆盖此处所述的UINavigationController委托方法：UINavigationController and back button action