在swift中在UIImageView上创建缩放-Java 学习之路

我目前正在从我的服务器加载图像 . 图像很多，具体取决于它返回的图像数量 . 我已经能够成功显示这些图像，我可以向下滚动查看所有图像 . 现在我的问题是我想要一种方法，我可以点击特定的图像，我将能够缩放它 . 我在下面分享了我的代码：

//This line of code downloads the images and displays them
for obj in message{
                                if let dict = obj as? NSDictionary {
                                   self.imagePath = dict.value(forKey: "path") as? String

                                    let albumThumbnail = photos()
                                    self.scrollView.addSubview(albumThumbnail)
                                    albumThumbnail.translatesAutoresizingMaskIntoConstraints = false
                                    albumThumbnail.leadingAnchor.constraint(equalTo: self.contentView.leadingAnchor).isActive = true
                                    albumThumbnail.topAnchor.constraint(equalTo: self.scrollView.topAnchor, constant: contentViewTopConstraint).isActive = true
                                    albumThumbnail.trailingAnchor.constraint(equalTo: self.contentView.trailingAnchor).isActive = true
                                    albumThumbnail.heightAnchor.constraint(equalToConstant: 150).isActive = true
                                    albumThumbnail.isUserInteractionEnabled = true


                                    if let path = self.path{
                                        if let imagePath = self.imagePath{
                                            let strippedPath = path.replacingOccurrences(of: "\\", with: "")
                                            let strippedImagePath = imagePath.replacingOccurrences(of: "\\", with: "")

                                            albumThumbnail.sd_setImage(with: URL(string: "\(strippedPath)\(strippedImagePath)"), placeholderImage: UIImage(named: "default_profile"), options: [.continueInBackground, .progressiveDownload])
                                        }
                                    }

                                    contentViewTopConstraint = contentViewTopConstraint + 170
                                }
                            }

1 回答

在图像点击时，U创建了滚动视图并将相应的图像添加为子视图，然后缩放就可以了 .

var getClickImage = UIImageView()
var zoomscrollV = UIScrollView()

override func viewDidLoad() {
        super.viewDidLoad()
zoomscrollV.delegate = self
}

override func viewDidAppear(_ animated: Bool) {
        zoomscrollV.isHidden = true
        zoomscrollV.frame = CGRect(x:0, y:0, width:self.view.frame.width, height:self.view.frame.height - 50)
        zoomscrollV.minimumZoomScale=1
        zoomscrollV.maximumZoomScale=10
        zoomscrollV.bounces=false

        self.view.addSubview(zoomscrollV)

        getClickImage=UIImageView()

        getClickImage.frame = CGRect(x:0, y:0, width:zoomscrollV.frame.width, height:zoomscrollV.frame.height)
        getClickImage.backgroundColor = .black
        getClickImage.contentMode = .scaleAspectFit
        zoomscrollV.addSubview(getClickImage)
}


// ON CLICKING IMAGE ACTION
@objc func myImageTapped(_ sender: UITapGestureRecognizer) {

    zoomscrollV.isHidden = false

    // RESPECTIVE IMAGE
    getClickImage.image = BG_CARD_IMGS[(sender.view?.tag)!] 

    let closeButton: UIButton = UIButton(type: .custom)
    closeButton.frame = CGRect(x:40.0, y:self.view.frame.height - 50, width:self.view.frame.width - 80, height:50.0)
    closeButton.addTarget(self, action: #selector(self.closeZoom), for: .touchUpInside)
    closeButton.setTitle("CLOSE ZOOM", for: .normal)
    closeButton.setTitleColor(UIColor.red, for: .normal)

    // CLOSE BUTTON 
    self.view.addSubview(closeButton)

}

@objc func closeZoom(sender: AnyObject) {
    zoomscrollV.isHidden = true
    zoomscrollV.setZoomScale(1.0, animated: false)
    sender.removeFromSuperview()
}

//SCROLLVIEW DELEGATE
func viewForZooming(in scrollView: UIScrollView) -> UIView? {

    return getClickImage

}

OUTPUT

回复于 2024-04-29T22:54:45+08:00

在swift中在UIImageView上创建缩放

1 回答

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