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A Google-Maps like single-finger zoom gesture for the ArcGIS Runtime SDK for iOS. Awesome idea, Google Maps team! 👏👏👏
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| // | |
| // AGSSingleFingerZoomGestureRecognizer.swift | |
| // | |
| // Created by Nicholas Furness on 6/17/16. | |
| // Copyright © 2016 Esri. All rights reserved. | |
| // | |
| import Foundation | |
| import ArcGIS | |
| import UIKit.UIGestureRecognizerSubclass | |
| enum AGSSingleFingerZoomMode { | |
| case Google | |
| case UpOutDownIn(centeredOnTap:Bool) | |
| case UpInDownOut(centeredOnTap:Bool) | |
| func translateScaleFactor(factor:Double) -> Double { | |
| switch self { | |
| case .Google, .UpOutDownIn: | |
| return -factor | |
| case .UpInDownOut: | |
| return factor | |
| } | |
| } | |
| } | |
| class AGSSingleFingerZoomGestureRecognizer : UIGestureRecognizer { | |
| var scalePower:Double = 5.0 | |
| var zoomMode:AGSSingleFingerZoomMode = .UpOutDownIn(centeredOnTap: true) | |
| private var anchorPoint:CGPoint? | |
| override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent) { | |
| super.touchesBegan(touches, withEvent: event) | |
| guard let mapView = self.view as? AGSMapView else { | |
| print("You should only apply \(self.dynamicType) to an AGSMapView!") | |
| self.state = .Failed | |
| return | |
| } | |
| guard touches.count == 1 else { | |
| // Single finger only | |
| self.state = .Cancelled | |
| return | |
| } | |
| if let tap = touches.first { | |
| guard tap.tapCount <= 2 else { | |
| // Second tap becomes the drag, so no more than 2 taps allowed | |
| self.state = .Cancelled | |
| return | |
| } | |
| if tap.tapCount == 2 { | |
| // We're doing the drag, so remember where we tapped | |
| self.anchorPoint = self.locationInView(mapView) | |
| self.state = .Began | |
| } | |
| } | |
| } | |
| override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent) { | |
| super.touchesMoved(touches, withEvent: event) | |
| guard self.state != .Failed else { | |
| // Apple recommend you check this. | |
| return | |
| } | |
| guard [.Began, .Changed].contains(self.state) else { | |
| // Only continue if we've determined the gesture is happening, continue. | |
| return | |
| } | |
| guard let mapView = self.view as? AGSMapView else { | |
| print("You should only apply \(self.dynamicType) to an AGSMapView!") | |
| self.state = .Failed | |
| return | |
| } | |
| guard touches.count == 1 else { | |
| // Only 1 finger | |
| self.state = .Cancelled | |
| return | |
| } | |
| if let touch = touches.first { | |
| let prevLoc = touch.previousLocationInView(mapView) | |
| let thisLoc = touch.locationInView(mapView) | |
| if CGPointEqualToPoint(prevLoc, thisLoc) { | |
| return | |
| } | |
| let diff = Double(thisLoc.y - prevLoc.y) | |
| // Scale ratio is determined by taking a proportion of the screen height we've dragged, and raising by a power. | |
| let scaleRatio = pow(1 + (self.zoomMode.translateScaleFactor(diff) / Double(mapView.frame.height)), self.scalePower) | |
| switch self.zoomMode { | |
| case .UpInDownOut(true), .UpOutDownIn(true): | |
| // Zoom in/out around the tap point | |
| mapView.zoomWithFactor(scaleRatio, atAnchorPoint: self.anchorPoint!, animated: false) | |
| default: | |
| // Zoom in/out around the center of the map view | |
| let newScale = mapView.mapScale * scaleRatio | |
| mapView.zoomToScale(newScale, animated: false) | |
| } | |
| } | |
| } | |
| override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent) { | |
| super.touchesEnded(touches, withEvent: event) | |
| self.state = .Ended | |
| } | |
| override func reset() { | |
| self.anchorPoint = nil | |
| } | |
| } |
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| // | |
| // ViewController.swift | |
| // DoubleTapZoom | |
| // | |
| // Created by Nicholas Furness on 6/17/16. | |
| // Copyright © 2016 Esri. All rights reserved. | |
| // | |
| import UIKit | |
| import ArcGIS | |
| class ViewController: UIViewController { | |
| @IBOutlet weak var mapView: AGSMapView! | |
| let singleFingerZoomGesture = AGSSingleFingerZoomGestureRecognizer() | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| // Do any additional setup after loading the view, typically from a nib. | |
| let basemap = AGSTiledMapServiceLayer(URL: NSURL(string:"http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer")) | |
| self.mapView.addMapLayer(basemap) | |
| self.mapView.addGestureRecognizer(self.singleFingerZoomGesture) | |
| } | |
| override func didReceiveMemoryWarning() { | |
| super.didReceiveMemoryWarning() | |
| // Dispose of any resources that can be recreated. | |
| } | |
| } |
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