UIImageView 的延迟时间答案

【问题标题】：delay time on UIImageViewUIImageView 的延迟时间
【发布时间】：2016-07-21 09:12:39
【问题描述】：

当我将图像索引从 collectionView 发送到另一个 viewController 时，我有图像数组，该 viewController 全屏显示此图像，并且我让用户能够在图像之间滑动，但滑动时出现问题更改时图像之间的滑动非常快我需要在更改图像时延迟 UIImageView 上的时间关于该问题的任何解决方案？

下面的代码：

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

覆盖 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])!)

        }
    }
}

谢谢

【问题讨论】：

标签： swift swipe-gesture

【解决方案1】：

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])!)
        }

      }
   }
}

【讨论】：

非常感谢我把这个方法放在 viewdidload 的什么地方？
用同样的方法试试
检查持续时间后它将执行的更新答案
在评论动画里在做什么？褪色？
你不需要任何动画。