事實上,keithbhunter的代碼是緩慢的,因爲除了更新區域的速度比它可以加載它,地圖也正在改變高度會導致額外的開銷!
我更新了代碼,使其運行平穩。
有了這段代碼,我所做的就是保持地圖視圖具有相同的大小,但是我會移動中心點以補償滑動視圖的高度。
對於這段代碼的工作,你必須修改keithbhunter的設置,使得mapView的底部約束完全固定到超級視圖的底部(而不是滑動視圖(這樣mapView始終與超級視圖的大小相同)對於剩下的設置是一樣的。
此外,也可以自定義縮放量與可變maxMetersDistance
我在這裏,總是在艾菲爾鐵塔
中心
import UIKit
import MapKit
class ViewController: UIViewController {
@IBOutlet weak var mapView: MKMapView!
@IBOutlet weak var slidingView: UIView!
@IBOutlet weak var slidingViewHeight: NSLayoutConstraint!
var maxMetersDistance:CGFloat = 10000.0; // customize this to set how far the map zooms out of the interest area
override func viewDidLoad() {
super.viewDidLoad()
let pan = UIPanGestureRecognizer(target: self, action: "viewDidPan:")
self.slidingView.addGestureRecognizer(pan)
firstTimeCenter()
}
func firstTimeCenter(){
var coordinate = CLLocationCoordinate2D(latitude: 48.8582, longitude: 2.2945)
let region = MKCoordinateRegionMakeWithDistance(coordinate, Double(maxMetersDistance), Double(maxMetersDistance))
self.mapView.setRegion(region, animated: true)
}
func reloadMap() {
let height = CGFloat(self.slidingViewHeight.constant)
var regionDistance = (maxMetersDistance/self.view.frame.height) * height
regionDistance = maxMetersDistance - regionDistance
var coordinate = CLLocationCoordinate2D(latitude: 48.8582, longitude: 2.2945)
var mapRect = mapView.visibleMapRect;
var metersPerMapPoint = MKMetersPerMapPointAtLatitude(coordinate.latitude);
var metersPerPixel = CGFloat(metersPerMapPoint) * CGFloat(mapRect.size.width)/CGFloat(mapView.bounds.size.width);
var totalMeters = Double(metersPerPixel) * Double(height/2)
coordinate = self.translateCoord(coordinate, MetersLat: -totalMeters, MetersLong: 0.0)
let region = MKCoordinateRegionMakeWithDistance(coordinate, Double(regionDistance), Double(regionDistance))
self.mapView.setRegion(region, animated: false)
}
func viewDidPan(panGesture: UIPanGestureRecognizer) {
let location = panGesture.locationInView(self.view)
self.slidingViewHeight.constant = self.view.frame.size.height - location.y
self.reloadMap()
}
func translateCoord(coord:CLLocationCoordinate2D, MetersLat:Double, MetersLong:Double)->CLLocationCoordinate2D{
var tempCoord = CLLocationCoordinate2D()
var tempRegion = MKCoordinateRegionMakeWithDistance(coord, MetersLat, MetersLong);
var tempSpan = tempRegion.span;
tempCoord.latitude = coord.latitude + tempSpan.latitudeDelta;
tempCoord.longitude = coord.longitude + tempSpan.longitudeDelta;
return tempCoord;
}
}
你試過'setCenterCoordinate'的方法呢? –
當您平移覆蓋圖時,地圖應該是放大還是縮小? – keithbhunter
@keithbhunter是的,向內平移,向上平移,向下平移。 – Aodh