使用IBActionbutton缩放MapView
我有一个问题。 我的当前位置显示并居中在地图视图中，但地图区域不会放大。 我试图通过采取跨越和区域的didUpdateToLocation方法采取罗布的build议，但我不能实现它的权利。 我不认为这是识别我的调用setDialDialLoad和我的button不被识别。 请检查我的代码，并指出错误。 我的目标是能够使用IBActionbutton放大和缩小我的位置。
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- (IBAction)zoomIn:(id)sender; - (IBAction)zoomOut:(id)sender; 在viewDidLoad中
double miles = 0.5; MKCoordinateSpan span; span.latitudeDelta = miles/69.0; span.longitudeDelta = miles/69.0; MKCoordinateRegion region; region.span = span; [self.mapView setRegion:region animated:YES]; [self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES]; _mapView.mapType = MKMapTypeSatellite;
.m在我didUpdateToLocation方法。
[self.mapView setCenterCoordinate:newLocation.coordinate animated:YES];
。放大：
- (IBAction)zoomIn:(id)sender { MKCoordinateSpan span; span.latitudeDelta = _mapView.region.span.latitudeDelta * 2; span.longitudeDelta = _mapView.region.span.latitudeDelta * 2; MKCoordinateRegion region; region.span = span; region.center = _mapView.region.center; [self.mapView setRegion:region animated:YES]; }
。缩小 ：
- (IBAction)zoomOut:(id)sender { MKCoordinateSpan span; span.latitudeDelta = _mapView.region.span.latitudeDelta / 2; span.longitudeDelta = _mapView.region.span.latitudeDelta / 2; MKCoordinateRegion region; region.span = span; region.center = _mapView.region.center; [self.mapView setRegion:region animated:YES]; }
您可以获取当前region ，根据需要将span乘以或除以2（分割放大，缩小倍数），然后设置region ：
- (IBAction)zoomIn:(id)sender { MKCoordinateRegion region = self.mapView.region; region.span.latitudeDelta /= 2.0; region.span.longitudeDelta /= 2.0; [self.mapView setRegion:region animated:YES]; } - (IBAction)zoomOut:(id)sender { MKCoordinateRegion region = self.mapView.region; region.span.latitudeDelta = MIN(region.span.latitudeDelta * 2.0, 180.0); region.span.longitudeDelta = MIN(region.span.longitudeDelta * 2.0, 180.0); [self.mapView setRegion:region animated:YES]; }
如果你想让地图自动缩放到你的位置，你可以使用：
self.mapView.userTrackingMode = MKUserTrackingModeFollow;
如果您想手动执行此操作，则可以执行以下操作。 首先，定义一个类属性，以确定您是否已经放大或已经放大：
@property (nonatomic) BOOL alreadySetZoomScale;
然后更改您的didUpdateLocations （或didUpdateToLocation ）来检查并设置缩放比例一次：
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { CLLocation* newLocation = [locations lastObject]; // if less than zero, then valid lat and long not found if (newLocation.horizontalAccuracy < 0) return; if (!self.alreadySetZoomScale) { MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 1609, 1609); // 1 mile = 1609.34 meters self.mapView.region = region; [self.mapView setRegion:region animated:YES]; self.alreadySetZoomScale = YES; } else { [self.mapView setCenterCoordinate:newLocation.coordinate animated:YES]; } } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { // if prior to iOS 6, use this old `MKMapViewDelegate` method, but call our // other routine. if (SYSTEM_VERSION_LESS_THAN(@"6.0")) [self locationManager:manager didUpdateLocations:@[newLocation]]; }
这基本上是这样说的，“如果我还没有放大，根据新位置和该位置周围的一定数量的米来设置区域，但是如果我已经这样做了，就根据我当前的位置设置中心坐标，但是不要改变缩放比例（在我已经放大或缩小的情况下），这也会做一些有条件的iOS版本号逻辑（使用这里显示的macros ），确保最终用户是否在6.0之前运行iOS ，它会调用我们更新的方法。
顺便说一句，如果你在地图上显示用户的位置（例如self.mapView.showsUserLocation = YES; ），你可能希望在移动地图中心之前，这个didUpdateLocations也删除与MKUserLocation关联的覆盖层，否则可以离开旧的覆盖层：
[self.mapView removeOverlays:self.mapView.overlays];
尝试这个。 但是我还没有testing过。
- (IBAction)zoomIn:(id)sender { MKCoordinateSpan span; span.latitudeDelta = _mapView.region.span.latitudeDelta * 2; span.longitudeDelta = _mapView.region.span.latitudeDelta * 2; MKCoordinateRegion region; region.span = span; region.center = _mapView.region.center; [self.mapView setRegion:region animated:YES]; } - (IBAction)zoomOut:(id)sender { MKCoordinateSpan span; span.latitudeDelta = _mapView.region.span.latitudeDelta / 2; span.longitudeDelta = _mapView.region.span.latitudeDelta / 2; MKCoordinateRegion region; region.span = span; region.center = _mapView.region.center; [self.mapView setRegion:region animated:YES]; }
好的，这是我结束使用我的2 IBActionbutton（zoomIn和zoomOut）与我的mapView一起工作。 当你打开应用程序，用户的位置显示，地图放大和中心围绕它。 然后，您可以使用button放大或缩小2倍。*非常感谢罗布向我展示了方式。
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- (IBAction)zoomIn:(id)sender; - (IBAction)zoomOut:(id)sender;
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@interface LocationViewController () @property (nonatomic) BOOL alreadySetZoomScale; @end -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { if (!_alreadySetZoomScale) { MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 1609, 1609); // 1 mile = 1609.34 meters self.mapView.region = region; [self.mapView setRegion:region animated:YES]; _alreadySetZoomScale = YES; } else { [self.mapView setCenterCoordinate:newLocation.coordinate animated:YES]; } - (IBAction)zoomIn:(id)sender { MKCoordinateRegion region = self.mapView.region; region.span.latitudeDelta /= 2.0; region.span.longitudeDelta /= 2.0; self.mapView.region = region; } - (IBAction)zoomOut:(id)sender {; MKCoordinateRegion region = self.mapView.region; region.span.latitudeDelta *= 2.0; region.span.longitudeDelta *= 2.0; self.mapView.region = region; }
我有几个其他调用MKMapView像self.mapView.showsUserLocation = YES; 在viewDidLoad中，但这是非常多的。
Swift 2.0：
使用扩展：
extension MKMapView{ func zoomInPinAnnotationLocation(targetMapViewName : MKMapView?, delta: Double) { var region: MKCoordinateRegion = targetMapViewName!.region region.span.latitudeDelta /= delta region.span.longitudeDelta /= delta targetMapViewName!.region = region } func zoomOutPinAnnotationLocation(targetMapViewName : MKMapView?,delta: Double) { var region: MKCoordinateRegion = targetMapViewName!.region region.span.latitudeDelta *= delta region.span.longitudeDelta *= delta targetMapViewName!.region = region } }
用法：
var mapViewZoomStepperValue: Double = -1.0 @IBOutlet weak var mapViewZoomStepper: UIStepper! @IBAction func mapViewZoomStepperValueChanged(sender: AnyObject) { if (mapViewZoomStepper.value > mapViewZoomStepperValue) { mapViewZoomStepperValue = mapViewZoomStepperValue + 1.0 //Zoom In detailMapView.zoomInPinAnnotationLocation(detailMapView, delta: 3.0) } else { mapViewZoomStepperValue = mapViewZoomStepper.value - 1.0 //Zoom Out detailMapView.zoomOutPinAnnotationLocation(detailMapView, delta: 3.0) } }
Swift 3：
import GoogleMaps import GooglePlaces import CoreLocation import UIKit class LocationMapView: UIViewController, GMSMapViewDelegate, CLLocationManagerDelegate { @IBOutlet weak var mapView: GMSMapView! var mapViewZoomStepperValue: Float = 0.0 @IBOutlet weak var mapViewZoomStepper: UIStepper! override func viewDidLoad() { super.viewDidLoad() mapViewZoomStepper.minimumValue = -100 } @IBAction func mapViewZoomStepperValueChanged(_ sender: Any) { if (Float(mapViewZoomStepper.value) > mapViewZoomStepperValue){ mapViewZoomStepperValue = Float(mapViewZoomStepper.value) zoomIn() }else{ mapViewZoomStepperValue = Float(mapViewZoomStepper.value) zoomOut() } } func zoomIn() { print("Zoom in!!") if mapView.camera.zoom == mapView.maxZoom { return } let currentZoom = mapView.camera.zoom + 1 mapViewZoomController(currentZoom) } func zoomOut() { print("Zoom out!!") if mapView.camera.zoom == mapView.minZoom { return } let currentZoom = mapView.camera.zoom - 1 mapViewZoomController(currentZoom) } func mapViewZoomController(_ level: Float) { let point: CGPoint = mapView.center let coor: CLLocationCoordinate2D = mapView.projection.coordinate(for: point) let camera = GMSCameraPosition.camera(withLatitude: coor.latitude, longitude: coor.longitude, zoom: Float(level)) mapView.animate(to: camera) } }
您可以在3行代码中实现最基本的function
var region: MKCoordinateRegion = self.mapView.region region = MKCoordinateRegionMake(self.mapView.centerCoordinate, MKCoordinateSpanMake(0.005, 0.005)); self.mapView.setRegion(region, animated: true)