Ios 在UIScrollview上缩放图像后，它会在图像区域外滚动

我正在尝试使用

UIScrollview

实现图像缩放功能。我将图像保持在合适的位置。
图像位于

UIScrollView

中，并且给出的图像帧与

UIScrollView

类似
这是我的密码

class CroppingImageViewController: UIViewController, UIScrollViewDelegate{    
    var image:UIImage = UIImage()

    @IBOutlet var imageview:UIImageView!
    @IBOutlet var scrollview:UIScrollView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        imageview.image = image
        scrollview.contentSize = imageview.frame.size;
        scrollview.minimumZoomScale = 1.0;
        scrollview.maximumZoomScale = 4.0;
        scrollview.setZoomScale(scrollview.minimumZoomScale, animated: true)
        scrollview.delegate = self;
    }

    func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
        return imageview
    }
}  

我的要求是，图像应该滚动到它的内容

self.automaticallyAdjustsScrollViewInsets=NO;

根据apple文档，AutomaticJustScrollViewInsets默认为YES

所以它试图控制你的滚动视图

---

将此添加到viewdidload方法中，然后重试。

我搜索相同的内容已经有一段时间了。我确实喜欢这个。这对我来说很有效

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let image = info[UIImagePickerControllerOriginalImage] as! UIImage
        imageView.image = image

        imageView.contentMode = UIViewContentMode.center
        imageView.frame = CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height)

        ScrollView.contentSize = imageView.frame.size

        let scrollViewFrame = ScrollView.frame
        let scaleWidth = scrollViewFrame.size.width / ScrollView.contentSize.width
        let scaleHeight = scrollViewFrame.size.height/ScrollView.contentSize.height

        let minScale = min(scaleHeight, scaleWidth)

        ScrollView.minimumZoomScale = minScale
        ScrollView.maximumZoomScale = 1
        ScrollView.zoomScale = minScale
        ScrollView.clipsToBounds = true

        centerScrollViewContents()

        picker.dismiss(animated: true, completion: nil)

    }

 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

        }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
        }

        imageView.frame = contentsFrame
    }

func-imagePickerController（picker:UIImagePickerController，didFinishPickingMediaWithInfo:[字符串：任意]）{
将image=info[UIImagePickerControllerOriginalImage]设为！UIImage
imageView.image=image
imageView.contentMode=UIViewContentMode.center
imageView.frame=CGRect（x:0，y:0，宽度：image.size.width，高度：image.size.height）
ScrollView.contentSize=imageView.frame.size
让scrollViewFrame=ScrollView.frame
设scaleWidth=scrollViewFrame.size.width/ScrollView.contentSize.width
让scaleHeight=scrollViewFrame.size.height/ScrollView.contentSize.height
设最小刻度=最小（刻度高度，刻度宽度）
ScrollView.minimumZoomScale=minScale
ScrollView.maximumZoomScale=1
ScrollView.zoomScale=最小刻度
ScrollView.clipsToBounds=true
centerScrollViewContents（）
picker.disclose（动画：true，完成：nil）
}
func centerScrollViewContents（）{
让boundsSize=ScrollView.bounds.size
var contentsFrame=imageView.frame
如果contentsFrame.size.width

还是一样。不走运！！