delay time on UIImageView

Question

i have array of image when i send the index of image from collectionView to another viewController which is display this image in full screen and i give the user ability to swipe between images but the issue on the swipe the swipe between images when change it is very fast i need to delay time on UIImageView when the image is changed any solution on that issue ?

the code below:

var ImageIndex:Int = 0 // this is index image which i send it from previous view controller
var arrayOfUrlImageLarge:[String] = []// this array which contain all the url of images

override func viewDidLoad() {

    super.viewDidLoad()

imageView = UIImageView(image: UIImage(contentsOfFile: arrayOfUrlImageLarge[ImageIndex]))

    imageView.contentMode = UIViewContentMode.ScaleAspectFill

     let swipeGestureRight = UISwipeGestureRecognizer(target: self, action: #selector(ShowImageViewController.swipe(_:)))
    swipeGestureRight.direction = .Right
    let swipeGestureLeft = UISwipeGestureRecognizer(target: self, action: #selector(ShowImageViewController.swipe(_:)))
    swipeGestureLeft.direction = .Left
    self.imageView.addGestureRecognizer(swipeGestureLeft)
    self.imageView.addGestureRecognizer(swipeGestureRight)
 }

func swipe(gesture:UISwipeGestureRecognizer){

    if gesture.direction == .Right {

        if ImageIndex == 0 {
            imageView.image = UIImage(data: NSData(contentsOfFile: arrayOfUrlImageLarge[ImageIndex])!)
        }else {
            ImageIndex = ImageIndex - 1
            imageView.image = UIImage(data: NSData(contentsOfFile: arrayOfUrlImageLarge[ImageIndex])!)
        }
    }
    if gesture.direction == .Left{

        if ImageIndex >= arrayOfUrlImageLarge.count {
            ImageIndex = arrayOfUrlImageLarge.count - 1
            imageView.image = UIImage(data: NSData(contentsOfFile: arrayOfUrlImageLarge[ImageIndex])!)
        }else {
            ImageIndex = ImageIndex + 1
            if ImageIndex >= arrayOfUrlImageLarge.count {
                return
            }
            imageView.image = UIImage(data: NSData(contentsOfFile: arrayOfUrlImageLarge[ImageIndex])!)

        }
    }
}

Thank you

Subin K Kuriakose · Accepted Answer · 2016-07-21 11:44:26Z

0

func swipe(gesture:UISwipeGestureRecognizer){

   let delay = 4.5 * Double(NSEC_PER_SEC)
   let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
   dispatch_after(time, dispatch_get_main_queue()) {

       if gesture.direction == .Right {

        if ImageIndex == 0 {
           imageView.image = UIImage(data: NSData(contentsOfFile: arrayOfUrlImageLarge[ImageIndex])!)
        }
        else {
          ImageIndex = ImageIndex - 1
          imageView.image = UIImage(data: NSData(contentsOfFile: arrayOfUrlImageLarge[ImageIndex])!)
        }
       }
      if gesture.direction == .Left{

        if ImageIndex >= arrayOfUrlImageLarge.count {
           ImageIndex = arrayOfUrlImageLarge.count - 1
           imageView.image = UIImage(data: NSData(contentsOfFile: arrayOfUrlImageLarge[ImageIndex])!)
       }
       else {
         ImageIndex = ImageIndex + 1
         if ImageIndex >= arrayOfUrlImageLarge.count {
            return
         }
        imageView.image = UIImage(data: NSData(contentsOfFile: arrayOfUrlImageLarge[ImageIndex])!)
        }

      }
   }
}

edited Jul 21, 2016 at 11:44

answered Jul 21, 2016 at 10:35

Subin K Kuriakose

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5 Comments

Hamza Hassan Over a year ago

Thank you very much please where i put this method in viewdidload?

Subin K Kuriakose Over a year ago

try in the same method

Subin K Kuriakose Over a year ago

check the updated answer it will execute after the duration

Hamza Hassan Over a year ago

in the comment animation what am doing ? fade?

Subin K Kuriakose Over a year ago

you dont need to animate anything.

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