Swift-新单图浏览器(一行代码即可)

通过测试发现老版通过present控制器出现问题

问题描述(主要在iOS11以下) 点击present控制器后,其实控制器是出来的 只是层次结构出现了问题 通过下2图 可以看出来

image.png

image.png

后面直接改成弹出view

调用方法(一句代码实现)

HWNewImageBrowse.showView(imageView:imageView)

实现原理

import UIKit

///屏幕高度 && The screen height
private let HWNewImageBrowseScreenHeight = UIScreen.main.bounds.size.height
class HWNewImageBrowse: UIView {
    private var imageView = UIImageView.init()
    private var _image : UIImage?
    private var fromRect: CGRect? // 用于记录开始位置
    var image : UIImage? {
        set {
            _image = newValue
            if newValue == nil {return}
            addSubview(imageView)
            imageView.frame = getFullScreenImageRectWithImage(image: newValue!)
            imageView.image = newValue
        }
        get {
            return _image
        }
    }
    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = UIColor.black
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    
    /// 快速显示 imageView 必传
    class func showView(imageView:UIImageView) {
        let window = UIApplication.shared.keyWindow
        let view = HWNewImageBrowse.init(frame: UIScreen.main.bounds)
        /// 获取原图片在屏幕上的位置
        let oldrect = imageView.convert(imageView.bounds, to: window!)
        // 获取大图尺寸
        let bigrect = getFullScreenImageRectWithImage(image: imageView.image!)
        var newRect:CGRect?
        if bigrect.size.width >= bigrect.size.height { // 比较宽 高度为标准
            let newW = oldrect.size.height*bigrect.size.width/bigrect.size.height
            newRect = CGRect.init(x: oldrect.origin.x-(newW-oldrect.size.width)/2, y: oldrect.origin.y, width: newW, height: oldrect.size.height)
        } else { // 比较高 宽度为标准
            let newH = oldrect.size.width*bigrect.size.height/bigrect.size.width
            newRect = CGRect.init(x: oldrect.origin.x, y: oldrect.origin.y - (newH - oldrect.size.height)/2, width: oldrect.size.width, height: newH)
        }
        // 记录新图片位置
        view.fromRect = newRect
        view.isHidden = true
        view.image = imageView.image
        window?.addSubview(view)
        
        // 添加黑色背景
        let background = UIView(frame: UIScreen.main.bounds)
        background.backgroundColor = UIColor.black
        background.alpha = 0.0
        window?.addSubview(background)
        // 添加过渡图片
        let tempView = UIImageView.init()
        window?.addSubview(tempView)
        tempView.image = imageView.image
        tempView.frame = newRect!//imageView.convert(imageView.bounds, to: window!)
        
        let heightS = (imageView.bounds.size.height)/(imageView.bounds.size.width)*UIScreen.main.bounds.size.width
        UIView.animate(withDuration: 0.3, animations: {
            background.alpha = 1
            tempView.frame = bigrect
            if heightS < HWNewImageBrowseScreenHeight {
                tempView.center = (window?.center)!
            }
        }, completion: { (callBack) in
            background.removeFromSuperview()
            tempView.removeFromSuperview()
            view.isHidden = false
        })
    }
    override func touchesBegan(_ touches: Set, with event: UIEvent?) {
        let window = UIApplication.shared.keyWindow
        self.isHidden = false
        self.alpha = 0
        
        let background = UIView(frame: UIScreen.main.bounds)
        background.backgroundColor = UIColor.black
        background.alpha = 1
        window?.addSubview(background)
        
        let tempView = UIImageView.init()
        window?.addSubview(tempView)
        tempView.image = imageView.image
        tempView.frame = getFullScreenImageRectWithImage(image: self.imageView.image!)
        UIView.animate(withDuration: 0.3, animations: { [weak self] in
            background.alpha = 0
            tempView.frame = self!.fromRect!
        }, completion: { [weak self](callBack) in
            background.removeFromSuperview()
            tempView.removeFromSuperview()
            self!.removeFromSuperview()
        })
    }
}
/// 获取图片尺寸
private func getFullScreenImageRectWithImage(image:UIImage) -> CGRect {
    let size: CGSize = image.size
    let scaleX: CGFloat = UIScreen.main.bounds.size.width / size.width
    let scaleY: CGFloat = UIScreen.main.bounds.size.height / size.height
    if scaleX > scaleY {
        let width: CGFloat = size.width * scaleY
        return CGRect(x: UIScreen.main.bounds.size.width / 2.0 - width / 2.0, y: 0.0, width: width, height: UIScreen.main.bounds.size.height)
    } else {
        let height: CGFloat = size.height * scaleX
        return CGRect(x: 0, y: UIScreen.main.bounds.size.height / 2.0 - height / 2.0, width: UIScreen.main.bounds.size.width, height: height)
    }
}

Dome