Xcode Swift 图像缩放手势

Question

希望有人能帮助我。我正在尝试做一个缩放手势，因此当显示图像时，用户可以用手指缩放图像。

我呈现图像的代码是:

// MARK: Show image full screen

func imageTapped(img: AnyObject) {

    self.navigationController?.navigationBarHidden = true

    let imageView = productImage as UIImageView

    let newImageView = UIImageView(image: imageView.image)
    newImageView.frame = self.view.frame
    newImageView.backgroundColor = .blackColor()
    newImageView.contentMode = .ScaleToFill
    newImageView.userInteractionEnabled = true

    let tap = UITapGestureRecognizer(target: self, action: "dismissFullscreenImage:")
    newImageView.addGestureRecognizer(tap)
    self.view.addSubview(newImageView)
}

func dismissFullscreenImage(sender: UITapGestureRecognizer) {
    sender.view?.removeFromSuperview()
    self.navigationController?.navigationBarHidden = false
}

Answer 1

在 ScrollView 中使用 UIScrollView 并添加 UIImgeView

import UIKit

class ViewController: UIViewController,UIScrollViewDelegate
{
    var scrollV : UIScrollView!
    var imageView : UIImageView!

    override func viewDidLoad()
    {
        super.viewDidLoad()

        self.navigationController?.navigationBarHidden = true

        scrollV=UIScrollView()
        scrollV.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height)
        scrollV.minimumZoomScale=1
        scrollV.maximumZoomScale=3
        scrollV.bounces=false
        scrollV.delegate=self;
        self.view.addSubview(scrollV)

        imageView=UIImageView()
        imageView.image = UIImage(imageLiteral: "neymar.jpg")
        imageView.frame = CGRectMake(0, 0, scrollV.frame.width, scrollV.frame.height)
        imageView.backgroundColor = .blackColor()
        imageView.contentMode = .ScaleToFill
        scrollV.addSubview(imageView)
   }

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