Question

我有一张很长的图片，我想用ScrollView显示从上到下滚动页面。

我的问题是图片位于页面的右侧，并且无法将其置于页面中间。相反，当我双击页面来缩放照片时，图像会到达页面的中心，并且没有任何问题。

错误仅在我进入该页面并且照片全部在右侧时被剪切，因为它的一部分超出了页面。

我正在使用Swift，使用Autolayout（我的应用程序在没有它的情况下无法工作），这是ScrollView的代码。我希望你能帮助我......

    override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    navigationItem.title = nameString!

    imageView?.image = UIImage(named: imageName!)
    nameLabel?.text = nameString!

    // 1
    let image = UIImage(named: imageName!)!
    imageView = UIImageView(image: image)
    imageView.frame = CGRect(origin: CGPoint(x: 0, y: 0), size:image.size)
    scrollView.addSubview(imageView)

    // 2
    scrollView.contentSize = image.size

    // 3
    var doubleTapRecognizer = UITapGestureRecognizer(target: self, action: "scrollViewDoubleTapped:")
    doubleTapRecognizer.numberOfTapsRequired = 2
    doubleTapRecognizer.numberOfTouchesRequired = 1
    scrollView.addGestureRecognizer(doubleTapRecognizer)

    // 4
    let scrollViewFrame = scrollView.frame
    let scaleWidth = scrollViewFrame.size.width / scrollView.contentSize.width
    let scaleHeight = scrollViewFrame.size.height / scrollView.contentSize.height
    let minScale = min(scaleWidth, scaleHeight);
    scrollView.minimumZoomScale = minScale;

    // 5
    scrollView.maximumZoomScale = 1.0
    scrollView.zoomScale = minScale;

    // 6
    centerScrollViewContents()
}

func centerScrollViewContents() {
    let boundsSize = scrollView.bounds.size
    var contentsFrame = imageView.frame

    if contentsFrame.size.width < boundsSize.width {
        contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width) / 2.0
    } else {
        contentsFrame.origin.x = 0.0
    }

    if contentsFrame.size.height < boundsSize.height {
        contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height) / 2.0
    } else {
        contentsFrame.origin.y = 0.0
    }

    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 viewForZoomingInScrollView(scrollView: UIScrollView!) -> UIView! {
    return imageView
}

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

问题出在哪里？谢谢大家

Answer 1

解决了，只需要取消选中大小类并删除LaunchScreen大小。

使用Swift在UIScrollView中居中图像

1 个答案: