enum GridFillDirection
{
case Horizontal, Vertical
}
class ZoomableGridViewController: UIViewController,UIScrollViewDelegate {
//MARK: - Properties
var scrollView: UIScrollView!
var scrollIsZoomedIn = false
var gridView: UIView!//Grid!//or image etc
var puzzleDirection:GridFillDirection = .Horizontal
var logText:UILabel!
//MARK: - VC
override func viewDidLoad() {
super.viewDidLoad()
gridView = UIImageView(image: UIImage(named: "nasa_big"))//UIView(frame: CGRectMake(0,0,view.bounds.width,view.bounds.width))//
scrollView = UIScrollView(frame: CGRectMake(0,80,view.bounds.width,view.bounds.width))
scrollView.backgroundColor = UIColor.blackColor()
scrollView.contentSize = gridView.bounds.size
scrollView.autoresizingMask = UIViewAutoresizing.FlexibleWidth
scrollView.delegate = self
scrollView.maximumZoomScale = 4.0
setZoomScale()
scrollView.contentOffset = CGPoint(x: 0, y: 0)
scrollView.addSubview(gridView)
view.addSubview(scrollView)
setupGestureRecognizer()
setupLogText()
}
//MARK: - Setup Layout
func setupLogText()
{
let logtextHeight:CGFloat = 40
logText = UILabel(frame: CGRectMake(0,view.bounds.height-logtextHeight,view.bounds.width,logtextHeight))
logText.textAlignment = .Center
view.addSubview(logText)
createLogText()
}
func createLogText()
{
let text = (puzzleDirection == .Horizontal) ? "Hori" : "Verti"
logText.text = "\(text) zoom : \(scrollView.zoomScale) "
}
func setZoomScale() {
let widthScale = scrollView.bounds.size.width / gridView.bounds.size.width
let heightScale = scrollView.bounds.size.height / gridView.bounds.size.height
scrollView.minimumZoomScale = min(widthScale, heightScale)
scrollView.zoomScale = widthScale
}
//MARK: - ScrollView delegates
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
return gridView
}
func scrollViewDidZoom(scrollView: UIScrollView) {
let verticalPadding = gridView.bounds.size.height < scrollView.bounds.size.height ? (scrollView.bounds.size.height - gridView.bounds.size.height) / 2 : 0
let horizontalPadding = gridView.bounds.size.width < scrollView.bounds.size.width ? (scrollView.bounds.size.width - gridView.bounds.size.width) / 2 : 0
scrollView.contentInset = UIEdgeInsets(top: verticalPadding, left: horizontalPadding, bottom: verticalPadding, right: horizontalPadding)
}
//MARK: - Gestures
func setupGestureRecognizer() {
let doubleTap = UITapGestureRecognizer(target: self, action: #selector(ZoomableGridViewController.handleDoubleTap(_:)))
doubleTap.numberOfTapsRequired = 2
scrollView.addGestureRecognizer(doubleTap)
let singleTap = UITapGestureRecognizer(target: self, action: #selector(ZoomableGridViewController.handleSingleTap(_:)))
singleTap.numberOfTapsRequired = 1
scrollView.addGestureRecognizer(singleTap)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(ZoomableGridViewController.handleSwipeGesture(_:)))
swipeRight.direction = UISwipeGestureRecognizerDirection.Right
self.view.addGestureRecognizer(swipeRight)
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(ZoomableGridViewController.handleSwipeGesture(_:)))
swipeDown.direction = UISwipeGestureRecognizerDirection.Down
self.view.addGestureRecognizer(swipeDown)
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(ZoomableGridViewController.handleSwipeGesture(_:)))
swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
self.view.addGestureRecognizer(swipeLeft)
let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(ZoomableGridViewController.handleSwipeGesture(_:)))
swipeUp.direction = UISwipeGestureRecognizerDirection.Up
self.view.addGestureRecognizer(swipeUp)
}
func handleSwipeGesture(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
createLogText()
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.Right:
logText.text? += "Swiped right select next horizontal region"
if swipeGesture.state == UIGestureRecognizerState.Began
{
}
case UISwipeGestureRecognizerDirection.Down:
logText.text? += "Swiped down select next vertical region"
case UISwipeGestureRecognizerDirection.Left:
logText.text? += "Swiped left select previous horizontal region"
case UISwipeGestureRecognizerDirection.Up:
logText.text? += "Swiped up select previous vertical region"
default:
break
}
}
}
func checkZoomState()
{
let widthScale = scrollView.bounds.size.width / gridView.bounds.size.width
if widthScale == scrollView.zoomScale
{
//print("zoom scale full")
scrollIsZoomedIn = false
}
else
{
//print("zoom scale zoomed")
scrollIsZoomedIn = true
}
}
func handleSingleTap(recognizer: UITapGestureRecognizer)
{
checkZoomState()
createLogText()
if scrollIsZoomedIn
{
logText.text? += "singleTap - selected cell if selected change direction"
}
else
{
logText.text? += "singleTap - selected cell "
}
}
func handleDoubleTap(recognizer: UITapGestureRecognizer) {
//print("double tap")
checkZoomState()
createLogText()
if puzzleDirection == .Horizontal
{
puzzleDirection = .Vertical
}
else
{
puzzleDirection = .Horizontal
}
}
}
