设置导航 backBarButtonItem 以转到 Swift 中的特定 UIViewController答案

【问题标题】：set navigation backBarButtonItem to go to specific UIViewController in Swift设置导航 backBarButtonItem 以转到 Swift 中的特定 UIViewController
【发布时间】：2015-02-27 10:37:50
【问题描述】：

我需要导航的后退按钮总是弹出一个特定的 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 是我每次点击返回按钮时需要显示的 UIViewController。

我不明白为什么不调用goToServizi func。请帮忙。

谢谢。

【问题讨论】：

标签： swift action backbarbuttonitem

【解决方案1】：

这是给你的例子。

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)
    }
}

编辑

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 是供您参考的示例。

根据您的需要修改代码。也许这会对您有所帮助。

【讨论】：

我必须在哪里为视图控制器添加标识符？这样我如何为后退按钮添加图像？
我试用了你的代码，它成功了。但我还有一个问题，我有大约 20 个带有自定义后退按钮的视图控制器，所以我必须将代码更改为你的。如何推送正确的视图？
你必须告诉每个按钮它会启动什么。

【解决方案2】：

self.navigationController?.popToViewController(ServiziVC(), animated: true) 你不能像那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UINavigationController 的委托方法，如下所述：UINavigationController and back button action

【讨论】：