第九天:9_SwiftDemo_EmbedSegueWithPageViewController

Posted 2020-10-25 chmhml

 

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 

 1 import UIKit
 2 
 3 class ViewController: UIViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource {
 4 
 5     @IBOutlet weak var redBtn: UIButton!
 6     @IBOutlet weak var yellowBtn: UIButton!
 7     @IBOutlet weak var blueBtn: UIButton!
 8     
 9     var vcArr = NSMutableArray.init()
10     var pageVC: UIPageViewController!
11     var currentIndex: Int {
12         get {
13             if redBtn.isSelected {
14                 return redBtn.tag
15             } else if yellowBtn.isSelected {
16                 return yellowBtn.tag
17             } else if blueBtn.isSelected {
18                 return blueBtn.tag
19             } else {
20                 return 0
21             }
22         }
23         
24         set {
25             if newValue == 0 {
26                 redBtn.isSelected = true
27                 yellowBtn.isSelected = false
28                 blueBtn.isSelected = false
29             } else if newValue == 1 {
30                 redBtn.isSelected = false
31                 yellowBtn.isSelected = true
32                 blueBtn.isSelected = false
33             } else if newValue == 2 {
34                 redBtn.isSelected = false
35                 yellowBtn.isSelected = false
36                 blueBtn.isSelected = true
37             }
38         }
39     }
40     
41     
42     override func viewDidLoad() {
43         super.viewDidLoad()
44         // Do any additional setup after loading the view, typically from a nib.
45         
46         let sb = UIStoryboard.init(name: "Main", bundle: nil)
47         
48         for tempID in ["RedViewController", "YellowViewController", "BlueViewController"] {
49             let tempVC = sb.instantiateViewController(withIdentifier: tempID)
50             vcArr.add(tempVC)
51         }
52         
53         pageVC = self.childViewControllers.first as! UIPageViewController!
54         pageVC.delegate = self
55         pageVC.dataSource = self
56         pageVC.setViewControllers([vcArr.object(at: 0) as! UIViewController], direction: .forward, animated: true, completion: nil)
57         currentIndex = 0
58     }
59 
60     @IBAction func handleBtnPressed(_ sender: UIButton) {
61         if currentIndex != sender.tag {
62             currentIndex = sender.tag
63             pageVC.setViewControllers([vcArr.object(at: currentIndex) as! UIViewController], direction: .forward, animated: false, completion: nil)
64         }
65     }
66     
67     override func didReceiveMemoryWarning() {
68         super.didReceiveMemoryWarning()
69         // Dispose of any resources that can be recreated.
70     }
71 
72     func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
73         let index = vcArr.index(of: viewController)
74         if index - 1 < 0 {
75             return nil
76         } else {
77             return vcArr.object(at: index - 1) as? UIViewController
78         }
79     }
80     
81     func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
82         let index = vcArr.index(of: viewController)
83         if index + 1 >= vcArr.count {
84             return nil
85         } else {
86             return vcArr.object(at: index + 1) as? UIViewController
87         }
88     }
89     
90     func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
91         currentIndex = vcArr.index(of: pageViewController.viewControllers?[0] as Any)
92     }
93 }