더블 헤드와 병음으로 그림을 확대하고 축소하다

애플리케이션 컨텐츠

코드

class ViewController: UIViewController , UIScrollViewDelegate{

    @IBOutlet var myImageView: UIImageView!
    @IBOutlet var myScrollView: UIScrollView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // スクロールビューの設定
        self.myScrollView.delegate = self
        self.myScrollView.minimumZoomScale = 1
        self.myScrollView.maximumZoomScale = 8
        self.myScrollView.scrollEnabled = true
        self.myScrollView.showsHorizontalScrollIndicator = true
        self.myScrollView.showsVerticalScrollIndicator = true

        var doubleTapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self
            , action:"doubleTap:")
        doubleTapGesture.numberOfTapsRequired = 2
        self.myImageView.userInteractionEnabled = true
        self.myImageView.addGestureRecognizer(doubleTapGesture)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    // ピンチイン・ピンチアウト
    func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
        print("pinch")
        return self.myImageView
    }
    // ダブルタップ
    func doubleTap(gesture: UITapGestureRecognizer) -> Void {

        print(self.myScrollView.zoomScale)
        if ( self.myScrollView.zoomScale < self.myScrollView.maximumZoomScale ) {

            var newScale:CGFloat = self.myScrollView.zoomScale * 3
            var zoomRect:CGRect = self.zoomRectForScale(newScale, center: gesture.locationInView(gesture.view))
            self.myScrollView.zoomToRect(zoomRect, animated: true)

        } else {
            self.myScrollView.setZoomScale(1.0, animated: true)
        }
    }
    // 領域
    func zoomRectForScale(scale:CGFloat, center: CGPoint) -> CGRect{
        var zoomRect: CGRect = CGRect()
        zoomRect.size.height = self.myScrollView.frame.size.height / scale
        zoomRect.size.width = self.myScrollView.frame.size.width / scale

        zoomRect.origin.x = center.x - zoomRect.size.width / 2.0
        zoomRect.origin.y = center.y - zoomRect.size.height / 2.0

        return zoomRect
    }
}

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