设置MKMapView的缩放级别

Question

我有一张正确显示的地图,我现在唯一要做的就是在加载时设置缩放级别.有没有办法做到这一点？

谢谢

Answer 1

我发现自己是一个解决方案,这很简单并且可以解决问题.使用MKCoordinateRegionMakeWithDistance以设置在米的距离垂直和水平以获得所需的变焦.当然,当您更新您的位置时,您将获得正确的坐标,或者您可以CLLocationCoordinate2D在启动时直接指定它,如果这是您需要做的:

CLLocationCoordinate2D noLocation;
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(noLocation, 500, 500);
MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits:viewRegion];          
[self.mapView setRegion:adjustedRegion animated:YES];
self.mapView.showsUserLocation = YES;

迅速:

let location = ...
let region = MKCoordinateRegionMakeWithDistance(location.coordinate, CLLocationDistance(exactly: 5000)!, CLLocationDistance(exactly: 5000)!)
mapView.setRegion(mapView.regionThatFits(region), animated: true)

Answer 2

基于经度线在地图的任何点均匀分布的事实,有一个非常简单的实现来设置centerCoordinate和zoomLevel:

@interface MKMapView (ZoomLevel)

@property (assign, nonatomic) NSUInteger zoomLevel;

- (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
                  zoomLevel:(NSUInteger)zoomLevel
                   animated:(BOOL)animated;

@end


@implementation MKMapView (ZoomLevel)

- (void)setZoomLevel:(NSUInteger)zoomLevel {
    [self setCenterCoordinate:self.centerCoordinate zoomLevel:zoomLevel animated:NO];
}

- (NSUInteger)zoomLevel {
    return log2(360 * ((self.frame.size.width/256) / self.region.span.longitudeDelta)) + 1;
}

- (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
zoomLevel:(NSUInteger)zoomLevel animated:(BOOL)animated {
    MKCoordinateSpan span = MKCoordinateSpanMake(0, 360/pow(2, zoomLevel)*self.frame.size.width/256);
    [self setRegion:MKCoordinateRegionMake(centerCoordinate, span) animated:animated];
}

@end

Answer 3

它没有内置,但我已经看到/使用过此代码.这允许你使用这个:

[mapView setCenterCoordinate:myCoord zoomLevel:13 animated:YES];

注意:这不是我的代码,我没有写,所以因此不能归功于它

Answer 4

您还可以使用MKCoordinateRegion进行缩放并设置其跨度纬度和经度增量.下面是一个快速参考,这是iOS参考.它不会做任何花哨的事情,但应该允许你在绘制地图时设置缩放.

MKCoordinateRegion region;
region.center.latitude = {desired lat};
region.center.longitude = {desired lng};
region.span.latitudeDelta = 1;
region.span.longitudeDelta = 1;
mapView.region = region;

编辑1:

MKCoordinateRegion region;
region.center.latitude = {desired lat};
region.center.longitude = {desired lng};
region.span.latitudeDelta = 1;
region.span.longitudeDelta = 1;
region = [mapView regionThatFits:region];
[mapView setRegion:region animated:TRUE];

Answer 5

快速实施

import Foundation
import MapKit

class MapViewWithZoom: MKMapView {

    var zoomLevel: Int {
        get {
            return Int(log2(360 * (Double(self.frame.size.width/256) / self.region.span.longitudeDelta)) + 1);
        }

        set (newZoomLevel){
            setCenterCoordinate(coordinate:self.centerCoordinate, zoomLevel: newZoomLevel, animated: false)
        }
    }

    private func setCenterCoordinate(coordinate: CLLocationCoordinate2D, zoomLevel: Int, animated: Bool) {
        let span = MKCoordinateSpan(latitudeDelta: 0, longitudeDelta: 360 / pow(2, Double(zoomLevel)) * Double(self.frame.size.width) / 256)
        setRegion(MKCoordinateRegion(center: coordinate, span: span), animated: animated)
    }
}

Answer 6

一个简单的Swift实现,如果你使用outlet.

@IBOutlet weak var mapView: MKMapView! {
    didSet {
        let noLocation = CLLocationCoordinate2D()
        let viewRegion = MKCoordinateRegionMakeWithDistance(noLocation, 500, 500)
        self.mapView.setRegion(viewRegion, animated: false)
    }
}

根据@ Carnal的回答.

Answer 7

对于Swift 3来说,这是非常快的:

private func setMapRegion(for location: CLLocationCoordinate2D, animated: Bool)
{
    let viewRegion = MKCoordinateRegionMakeWithDistance(location, <#T##latitudinalMeters: CLLocationDistance##CLLocationDistance#>, <#T##longitudinalMeters: CLLocationDistance##CLLocationDistance#>)
    MapView.setRegion(viewRegion, animated: animated)
}

只需定义lat-,long-Meters <CLLocationDistance>,mapView就会使缩放级别符合您的值.

Answer 8

基于@AdilSoomro的绝佳答案.我想出了这个:

@interface MKMapView (ZoomLevel)
- (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
                  zoomLevel:(NSUInteger)zoomLevel
                   animated:(BOOL)animated;

-(double) getZoomLevel;
@end



@implementation MKMapView (ZoomLevel)

- (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
                  zoomLevel:(NSUInteger)zoomLevel animated:(BOOL)animated {
    MKCoordinateSpan span = MKCoordinateSpanMake(0, 360/pow(2, zoomLevel)*self.frame.size.width/256);
    [self setRegion:MKCoordinateRegionMake(centerCoordinate, span) animated:animated];
}


-(double) getZoomLevel {
    return log2(360 * ((self.frame.size.width/256) / self.region.span.longitudeDelta));
}

@end