Question

我有以下问题：我有下一个tableviewcell架构，

的UITableViewCell
- containerView
  - scrollView（用于缩放UIImageView）
    - 的UIImageView

问题在于，当我放大UIImageView时，它总是会弹回到图片的左上角，任何缩放。当我缩小时，可以看到缩小到左上角。

没有约束，一切都是以编程方式创建的

尝试了我在堆栈溢出时可以找到的所有技术，但没有解决它。我认为原因是在uitableviewcell中执行此操作有问题。那就是我的TableViewCell.swift里面的内容

override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    self.frame = CGRectMake(0, 0, screenWidth, screenWidth)
    self.ImageView.frame = CGRectMake(0,0,screenWidth,screenWidth)
    self.CameraView.frame = CGRectMake(0,0,screenWidth,screenWidth)
    self.ScrollView.frame = CGRectMake(0,0,screenWidth,screenWidth)
    self.addSubview(CameraView)

    //!----Scroll view----//
    ScrollView.delegate = self
    ScrollView.alwaysBounceHorizontal = false
    ScrollView.alwaysBounceVertical = false
    ScrollView.bounces = false
    ScrollView.bouncesZoom = false
    ScrollView.minimumZoomScale = 1.0
    ScrollView.maximumZoomScale = 10.0
    ScrollView.contentSize = CGSizeMake(screenWidth, screenWidth)

    ScrollView.pagingEnabled = false

    var doubleTapRecognizer = UITapGestureRecognizer(target: self, action: "scrollViewDoubleTapped:")
    doubleTapRecognizer.numberOfTapsRequired = 2
    doubleTapRecognizer.numberOfTouchesRequired = 1
    ScrollView.addGestureRecognizer(doubleTapRecognizer)
    self.contentView.addSubview(ScrollView)
    self.ScrollView.addSubview(ImageView)

    var centerPoint = CGPointMake(CGRectGetMidX(self.ScrollView.bounds), CGRectGetMidY(self.ScrollView.bounds))
    ImageView.center = centerPoint
    ScrollView.center = centerPoint
    ImageView.userInteractionEnabled = true
    ImageView.clipsToBounds = false

    centerScrollViewContents()


}
func centerScrollViewContents(){
    var boundsSize:CGSize = self.ScrollView.bounds.size
    var contentsFrame = self.ImageView.frame

    if (contentsFrame.size.width < boundsSize.width){
        contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width)/2
    }else{
        contentsFrame.origin.x = 0
    }

    if (contentsFrame.size.height < boundsSize.height){
        contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height)/2
    }else{
        contentsFrame.origin.y = 0
    }

    self.ImageView.frame = contentsFrame
}
func scrollViewDoubleTapped(recognizer: UITapGestureRecognizer) {
    // 1
    let pointInView = recognizer.locationInView(ImageView)

    // 2
    var newZoomScale = ScrollView.zoomScale * 1.5
    newZoomScale = min(newZoomScale, ScrollView.maximumZoomScale)

    // 3
    let scrollViewSize = ScrollView.bounds.size
    let w = scrollViewSize.width / newZoomScale
    let h = scrollViewSize.height / newZoomScale
    let x = pointInView.x - (w / 2.0)
    let y = pointInView.y - (h / 2.0)

    let rectToZoomTo = CGRectMake(x, y, w, h);

    // 4
    ScrollView.zoomToRect(rectToZoomTo, animated: true)
}


func scrollViewDidZoom(scrollView: UIScrollView) {
    centerScrollViewContents()
}

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

使用缩放在UITableViewCell中缩放UIImageView

0 个答案: