Wie man Bilder zoomt, wenn sie in mehreren Seiten in swift sind

Question

Ich habe eine Hauptscrollansicht und in dieser Hauptscrollansicht habe ich eine Kindscrollansicht, die UIImageView hat. Ich habe ein Problem beim Zoomen der Bildlaufansicht. Immer wenn ich versuche, in das Bild zu zoomen, bewegt sich die Ansicht nur, aber das Bild wird nicht vergrößert. Ich weiß nicht, was ich falsch mache. Kann mir bitte jemand helfen, zu sehen, was los ist? Hier ist mein Code:

import UIKit 

class ImageViewerViewController: UIViewController, UIScrollViewDelegate { 

    @IBOutlet weak var scrollView: UIScrollView! 

    @IBOutlet weak var pageControl: UIPageControl! 

    var tap: UITapGestureRecognizer? 

    var seguedAlbumImagePathArray=[] 
    var seguedCurrentImageIndex: Int? 

    var imageView: UIView? 
    var childScrollView: UIScrollView? 
    var imagev: UIImageView? 

    var totalPages: Int = 0 

    override func shouldAutorotate() -> Bool { 
     return false 
    } 

    override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask { 
     return UIInterfaceOrientationMask.Portrait 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     totalPages = seguedAlbumImagePathArray.count 
     view.bringSubviewToFront(pageControl) 

     tap = UITapGestureRecognizer(target: self, action: #selector(ImageViewerViewController.dismissImageViewer)) 
     scrollView.addGestureRecognizer(tap!) 
    } 

    func dismissImageViewer() { 
     UIView.animateWithDuration(0.2, animations: {() -> Void in 
      self.scrollView.alpha=0 
     }) 
     NSTimer.scheduledTimerWithTimeInterval(0.13, target: self, selector: #selector(self.dismissView), userInfo: nil, repeats: true) 
    } 

    func dismissView() { 
     self.presentingViewController?.dismissViewControllerAnimated(false, completion: { 
      let secondPresentingVC = self.presentingViewController?.presentingViewController; 
      secondPresentingVC?.dismissViewControllerAnimated(false, completion: {}) 
     }) 
    } 

    override func viewDidAppear(animated: Bool) { 
     super.viewDidAppear(animated) 

     configureScrollView() 
     configurePageControl() 
    } 


    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 


    override func preferredStatusBarStyle() -> UIStatusBarStyle { 
     return UIStatusBarStyle.LightContent 
    } 


    // MARK: Custom method implementation 

    func configureScrollView() { 

     self.scrollView.backgroundColor = UIColor.blackColor() 

     // Enable paging. 
     scrollView.pagingEnabled = true 

     // Set the following flag values. 
     scrollView.showsHorizontalScrollIndicator = false 
     scrollView.showsVerticalScrollIndicator = false 
     scrollView.scrollsToTop = false 

     // Set the scrollview content size. 
     scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * CGFloat(totalPages), scrollView.frame.size.height) 

     // Set self as the delegate of the scrollview. 
     scrollView.delegate = self 

     // Load the ImageView view from the ImageView.xib file and configure it properly. 
     for i in 0 ..< totalPages { 
      // Load the ImageView view. 
      imageView = NSBundle.mainBundle().loadNibNamed("ImageView", owner: self, options: nil)[0] as! UIView 

      imageView!.backgroundColor = UIColor.blackColor() 
      // Set its frame and the background color. 
      imageView!.frame = CGRectMake(CGFloat(i) * scrollView.frame.size.width, scrollView.frame.origin.y, scrollView.frame.size.width, scrollView.frame.size.height) 
      //imageView.backgroundColor = sampleBGColors[i] 

      // Set the proper message to the test view's label. 
      let label = imageView!.viewWithTag(1) as! UILabel 
      label.text = "\(i + 1)/\(totalPages)" 

      childScrollView = imageView!.viewWithTag(2) as? UIScrollView 
      childScrollView?.minimumZoomScale=1.0 
      childScrollView?.maximumZoomScale=6.0 
      childScrollView?.delegate = self 

      imagev = childScrollView!.viewWithTag(3) as? UIImageView 
      view.sendSubviewToBack(imagev!) 

      if let imageData = NSUserDefaults.standardUserDefaults().objectForKey(seguedAlbumImagePathArray[i] as! String), 
       let imageToDisplay = UIImage(data: imageData as! NSData) { 
       imagev!.image = imageToDisplay 
      } 
      else { 
       ImageLoader.sharedLoader.imageForUrl(seguedAlbumImagePathArray[i] as! String, completionHandler:{(image: UIImage?, url: String) in 
        self.imagev!.image = image 
       }) 
      } 

      var frame: CGRect = scrollView.frame 
      frame.origin.x = frame.size.width * CGFloat(seguedCurrentImageIndex!) 
      frame.origin.y = 0 
      scrollView.scrollRectToVisible(frame, animated: false) 

      scrollView.addSubview(imageView!) 
      //scrollView.setContentOffset(CGPoint, animated: true) 
      print(scrollView.contentOffset) 
     } 
    } 


    func configurePageControl() { 
     // Set the total pages to the page control. 
     pageControl.numberOfPages = totalPages 

     // Set the initial page. 
     pageControl.currentPage = seguedCurrentImageIndex! 
    } 


    // MARK: UIScrollViewDelegate method implementation 

    func scrollViewDidScroll(scrollView: UIScrollView) { 
     // Calculate the new page index depending on the content offset. 
     let currentPage = floor(scrollView.contentOffset.x/UIScreen.mainScreen().bounds.size.width); 
     //1.025 = 328/320 
     // Set the new page index to the page control. 
     pageControl.currentPage = Int(currentPage) 
    } 


    // MARK: IBAction method implementation 

    @IBAction func changePage(sender: AnyObject) { 
     // Calculate the frame that should scroll to based on the page control current page. 
     var newFrame = scrollView.frame 
     newFrame.origin.x = newFrame.size.width * CGFloat(pageControl.currentPage) 
     scrollView.scrollRectToVisible(newFrame, animated: true) 

    } 

    func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? { 
     return self.imagev 
    } 
} 

Answer 1

Ich hatte ähnliches Problem, wenn ich scrollview unter einem UIcontrolViewCtroller setzen. diese entfernen -

func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? { 
     return self.imagev 
    } 

und

func viewForZooming(in scrollView: UIScrollView) -> UIView? { 
     return imgview 
    } 

die für mich gearbeitet verwenden.