UINavigationController视图控制器切换（二）

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上节地址: http://blog.csdn.net/lwjok2007/article/details/48346719

我们接着上节继续看返回指定ViewController

首先再创建两个UIViewController的子类

分别命名：ThirdViewController，ForthViewController

然后我们分别在SecondViewController 和 ThirdViewController上添加button点击后跳转下一个页面

SecondViewController代码

import UIKitclass SecondViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view.        self.title="第二个页面"                let btn=UIButton(frame: CGRectMake(20, 120, 320, 36))        btn.setTitle("弹出第三个视图", forState: UIControlState.Normal)        btn.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)        btn.addTarget(self, action: "openAct", forControlEvents: UIControlEvents.TouchDown)        self.view.addSubview(btn)            }    func openAct(){        let thirdVC=ThirdViewController()        self.navigationController?.pushViewController(thirdVC, animated: true)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }        /*    // MARK: - Navigation    // In a storyboard-based application, you will often want to do a little preparation before navigation    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {        // Get the new view controller using segue.destinationViewController.        // Pass the selected object to the new view controller.    }    */}

ThirdViewController代码

import UIKitclass ThirdViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view.        self.title="第三个页面"                let btn=UIButton(frame: CGRectMake(20, 120, 320, 36))        btn.setTitle("弹出第四个视图", forState: UIControlState.Normal)        btn.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)        btn.addTarget(self, action: "openAct", forControlEvents: UIControlEvents.TouchDown)        self.view.addSubview(btn)    }    func openAct(){        let forthVC=ForthViewController()        self.navigationController?.pushViewController(forthVC, animated: true)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }        /*    // MARK: - Navigation    // In a storyboard-based application, you will often want to do a little preparation before navigation    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {        // Get the new view controller using segue.destinationViewController.        // Pass the selected object to the new view controller.    }    */}

我们执行代码就发现已经可以跳转了

接下来我们给FortthViewController 添加三个button。

        let btn=UIButton(frame: CGRectMake(20, 120, 320, 36))        btn.setTitle("回到第一个页面", forState: UIControlState.Normal)        btn.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)        btn.tag=91        btn.addTarget(self, action: "openAct:", forControlEvents: UIControlEvents.TouchDown)        self.view.addSubview(btn)                let btn2=UIButton(frame: CGRectMake(20, 170, 320, 36))        btn2.setTitle("回到第二个页面", forState: UIControlState.Normal)        btn2.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)        btn2.tag=92        btn2.addTarget(self, action: "openAct:", forControlEvents: UIControlEvents.TouchDown)        self.view.addSubview(btn2)                let btn3=UIButton(frame: CGRectMake(20, 220, 320, 36))        btn3.setTitle("回到第三个页面", forState: UIControlState.Normal)        btn3.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)        btn3.tag=93        btn3.addTarget(self, action: "openAct:", forControlEvents: UIControlEvents.TouchDown)        self.view.addSubview(btn3)

    func openAct(btn:UIButton){        if btn.tag==91{            //回到首页            self.navigationController?.popToRootViewControllerAnimated(true)        }else if btn.tag==92{            //通过堆栈顺序获取要跳转的视图控制器            let vc=self.navigationController?.viewControllers[1] as! UIViewController            self.navigationController?.popToViewController(vc, animated: true)        }else if btn.tag==93{            //返回到上一个页面            self.navigationController?.popViewControllerAnimated(true)        }    }

我们点击按钮看下效果

这里要说明的一点是跳转到指定ViewController中我们首先调用了NavigationController的viewControllers[1]来获取了要跳转到的视图控制器。视图控制器跳转的时候是按照栈的方式来的.

我们例子中的首页是第一次出现在navigationController中的，所以栈底就是我们需要的首页，我们可以使用viewControllers[0] 来测试一下看能不能跳转首页

好了基本简单的跳转都实现了。大家有问题欢迎加群讨论

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