使用IBAction为按钮可以放大的MapView(Using IBAction Buttons t

2019-07-20 20:09发布

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我有一个问题。 我现在的位置显示在地图视图然而在地图区域不会被放大到中心。 我试着服用罗布的建议采取跨度和区域出didUpdateToLocation方法，但我不能已经实现它的权利。 我不认为这是我认识呼吁setRegion在viewDidLoad中和我的按钮不被认可。 请在下面检查我的代码，并指出错误（或多个）。 我的目标是能够进出使用IBAction为按钮我的位置的放大。

。H 

- (IBAction)zoomIn:(id)sender;

- (IBAction)zoomOut:(id)sender;

.M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];
}

Answer 1:

你可以得到当前region ，乘或除的span由两个酌情（将在变焦，变焦上进行相乘），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];
}

如果你想拥有的地图自动缩放到你的位置，你可以使用： 

self.mapView.userTrackingMode = MKUserTrackingModeFollow;

如果你想手动做到这一点，你可以不喜欢以下。 首先，定义您是否已经或没有放大的类属性： 

@property (nonatomic) BOOL alreadySetZoomScale;

然后改变你的didUpdateLocations （或didUpdateToLocation ）检查此并设置变焦倍数一次： 

- (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]];
}

这基本上说，“如果我没有在放大的是，设置基于区域newLocation以及一定数量的周围的位置公尺，但是我已经做了，刚刚设置的中心坐标根据我目前的位置，但不改变变焦倍数（如果我已经放大或缩小），这也做一些有条件的iOS版本号逻辑（使用这里显示宏 ），确保如果最终用户到6.0运行iOS之前，它会调用我们的更新方法。

顺便说一句，如果你正在展示的地图（如用户位置self.mapView.showsUserLocation = YES;你可能希望有这种didUpdateLocations也删除与该关联覆盖MKUserLocation移动地图中心之前，否则可以保留旧覆盖围坐： 

[self.mapView removeOverlays:self.mapView.overlays];


Answer 2:

试试这个。 但我尚未对其进行测试。 

- (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];

 }


Answer 3:

OK，这是我用得到我的2个IBAction为按钮（zoomIn和缩小（ZoomOut））与我的MapView工作结束。 当您打开应用程序时，会显示用户的位置和地图放大并且围绕它的中心。 然后，您可以用按钮来放大或2倍缩小*大感谢Rob谁发现我的方式。

。H 

- (IBAction)zoomIn:(id)sender;

- (IBAction)zoomOut:(id)sender;

.M 

@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;

}

我还有其他几个来电的MKMapView像self.mapView.showsUserLocation = YES; 在viewDidLoad中，但是这几乎是它。



Answer 4:

雨燕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)
  }

 }


Answer 5:

斯威夫特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)

        }

}


Answer 6:

你可以达到3行代码最基本的

var region: MKCoordinateRegion = self.mapView.region
region = MKCoordinateRegionMake(self.mapView.centerCoordinate, MKCoordinateSpanMake(0.005, 0.005));
self.mapView.setRegion(region, animated: true)


文章来源: Using IBAction Buttons to Zoom MapView
标签： ios ios6 mkmapview zoom ibaction
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