Swift：点击图片，像桌面上的Facebook一样展开它

Question

我希望用户点击tableviewcell中的图片来展开我试过的 github上的4个库与自动布局无关。

我也发现它在Objective-c中，甚至不能与Xcode 7 MHFacebookImageViewer一起使用。 https://github.com/michaelhenry/MHFacebookImageViewer

也是https://github.com/aleckretch/AKImageViewer但在objective-c

是否有任何swift库？

Answer 1

如果您想在swift中使用此库，则必须Add Bridging Header

AKImageViewer - ，例如我从这个库中获取一点点代码

var aKImageViewerViewController: AKImageViewerController = AKImageViewerViewController()
aKImageViewerViewController.image = UIImage.imageName("lion.png")
aKImageViewerViewController.imgCancel = UIImage.imageNamed("btn_cancel.png")
self.view.addSubview(aKImageViewerViewController.view)
aKImageViewerViewController.centerPictureFromPoint(CGPointMake(0, 0), ofSize: CGSizeMake(30, 30), withCornerRadius: 1.0)

MHFacebookImageViewer - 例如，我从这个库中获取一个方法，你可以在swift中使用它

func setupImageViewer() {

   // Some code

}

func setupImageViewerWithCompletionOnOpen(open: MHFacebookImageViewerOpeningBlock, onClose close: MHFacebookImageViewerClosingBlock) {

  // Some code

}

Answer 2

这里是您需要实现的特殊动画，想象你有两个相似的矩形，它们的比例是相同的，然后我们使用W1 / W2 = H1 / H2的等式得到H2 =（W2 / W1） H1如果你对数学部分不感兴趣，请看一下代码，它基本上是两个函数，用于zoomIn动画和zoomOut，以回到绝对坐标系。

    let zoomImageView = UIImageView()
        let blackBackgroundView = UIView()
        let navBarCoverView = UIView()// to hide navigation bar
        let tabBarCoverView = UIView() // to hide tab bar

        var statusImageView: UIImageView?

        func animateImageView(statusImageView: UIImageView) {
            self.statusImageView = statusImageView

 //to get absolute coordinate system 
            if let startingFrame = statusImageView.superview?.convertRect(statusImageView.frame, toView: nil) {

                statusImageView.alpha = 0

                blackBackgroundView.frame = self.view.frame
                blackBackgroundView.backgroundColor = UIColor.blackColor()
                blackBackgroundView.alpha = 0
                view.addSubview(blackBackgroundView)

                navBarCoverView.frame = CGRectMake(0, 0, 1000, 20 + 44)
                navBarCoverView.backgroundColor = UIColor.blackColor()
                navBarCoverView.alpha = 0



                if let keyWindow = UIApplication.sharedApplication().keyWindow {
                    keyWindow.addSubview(navBarCoverView)

                    tabBarCoverView.frame = CGRectMake(0, keyWindow.frame.height - 49, 1000, 49)
                    tabBarCoverView.backgroundColor = UIColor.blackColor()
                    tabBarCoverView.alpha = 0
                    keyWindow.addSubview(tabBarCoverView)
                }

                zoomImageView.backgroundColor = UIColor.redColor()
                zoomImageView.frame = startingFrame
                zoomImageView.userInteractionEnabled = true
                zoomImageView.image = statusImageView.image
                zoomImageView.contentMode = .ScaleAspectFill
                zoomImageView.clipsToBounds = true
                view.addSubview(zoomImageView)

                zoomImageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: "zoomOut"))

                UIView.animateWithDuration(0.75, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0.5, options: .CurveEaseOut, animations: { () -> Void in

                    let height = (self.view.frame.width / startingFrame.width) * startingFrame.height

                    let y = self.view.frame.height / 2 - height / 2

                    self.zoomImageView.frame = CGRectMake(0, y, self.view.frame.width, height)

                    self.blackBackgroundView.alpha = 1

                    self.navBarCoverView.alpha = 1

                    self.tabBarCoverView.alpha = 1

                    }, completion: nil)

            }
        }

        func zoomOut() {
            if let startingFrame = statusImageView!.superview?.convertRect(statusImageView!.frame, toView: nil) {

                UIView.animateWithDuration(0.75, animations: { () -> Void in
                    self.zoomImageView.frame = startingFrame

                    self.blackBackgroundView.alpha = 0
                    self.navBarCoverView.alpha = 0
                    self.tabBarCoverView.alpha = 0

                    }, completion: { (didComplete) -> Void in
                        self.zoomImageView.removeFromSuperview()
                        self.blackBackgroundView.removeFromSuperview()
                        self.navBarCoverView.removeFromSuperview()
                        self.tabBarCoverView.removeFromSuperview()
                        self.statusImageView?.alpha = 1
                })

            }
        }

    }