iOS MKMapView缩放以显示所有标记

我正在使用MKMapView并在地图上绘制了几个点。我已经使用了MKCoordinateRegion和MKCoordinateSpan围绕其中一点实现缩放等 - 但这不是我想要的...iOS MKMapView缩放以显示所有标记

我正在尝试使用类似于JavaScript缩放功能的内容。所以我的所有观点都应该对用户可见。（在英国将会有大约10个点）我想把它们全部展示出来，或者如果大部分都在伦敦地区，放大到那里。

有没有办法以编程方式解决这个问题？

来源

2010-08-08 Matt Facer

当然。您想要在注释中找到最大和最小的纬度和经度值（您可以通过迭代map.annotations来完成），然后设置地图以显示所有这些值。

// pad our map by 10% around the farthest annotations 
#define MAP_PADDING 1.1 

// we'll make sure that our minimum vertical span is about a kilometer 
// there are ~111km to a degree of latitude. regionThatFits will take care of 
// longitude, which is more complicated, anyway. 
#define MINIMUM_VISIBLE_LATITUDE 0.01 

MKCoordinateRegion region; 
region.center.latitude = (minLatitude + maxLatitude)/2; 
region.center.longitude = (minLongitude + maxLongitude)/2; 

region.span.latitudeDelta = (maxLatitude - minLatitude) * MAP_PADDING; 

region.span.latitudeDelta = (region.span.latitudeDelta < MINIMUM_VISIBLE_LATITUDE) 
    ? MINIMUM_VISIBLE_LATITUDE 
    : region.span.latitudeDelta; 

region.span.longitudeDelta = (maxLongitude - minLongitude) * MAP_PADDING; 

MKCoordinateRegion scaledRegion = [map regionThatFits:region]; 
[map setRegion:scaledRegion animated:YES];

来源

2010-08-10 20:31:50

这是考虑到了，你是叠加到地图上标注享有高度的改善（这样注释的顶部不会被切断时，它的坐标偏移量是在底部例）。或者进一步推广，允许您以像素为单位指定填充，而不是以百分比形式填充。它需要一个两阶段的过程来查找注释的界限，然后进一步增加界限以考虑您的贴图填充。

- (void) zoomToAnnotationsBounds:(NSArray *)annotations { 

CLLocationDegrees minLatitude = DBL_MAX; 
CLLocationDegrees maxLatitude = -DBL_MAX; 
CLLocationDegrees minLongitude = DBL_MAX; 
CLLocationDegrees maxLongitude = -DBL_MAX; 

for (MyAnnotation *annotation in annotations) { 
      double annotationLat = annotation.coordinate.latitude; 
      double annotationLong = annotation.coordinate.longitude; 
    minLatitude = fmin(annotationLat, minLatitude); 
    maxLatitude = fmax(annotationLat, maxLatitude); 
    minLongitude = fmin(annotationLong, minLongitude); 
    maxLongitude = fmax(annotationLong, maxLongitude); 
} 

    // See function below 
[self setMapRegionForMinLat:minLatitude minLong:minLongitude maxLat:maxLatitude maxLong:maxLongitude]; 

// If your markers were 40 in height and 20 in width, this would zoom the map to fit them perfectly. Note that there is a bug in mkmapview's set region which means it will snap the map to the nearest whole zoom level, so you will rarely get a perfect fit. But this will ensure a minimum padding. 
UIEdgeInsets mapPadding = UIEdgeInsetsMake(40.0, 10.0, 0.0, 10.0); 
CLLocationCoordinate2D relativeFromCoord = [self.mapView convertPoint:CGPointMake(0, 0) toCoordinateFromView:self.mapView]; 

// Calculate the additional lat/long required at the current zoom level to add the padding 
CLLocationCoordinate2D topCoord = [self.mapView convertPoint:CGPointMake(0, mapPadding.top) toCoordinateFromView:self.mapView]; 
CLLocationCoordinate2D rightCoord = [self.mapView convertPoint:CGPointMake(0, mapPadding.right) toCoordinateFromView:self.mapView]; 
CLLocationCoordinate2D bottomCoord = [self.mapView convertPoint:CGPointMake(0, mapPadding.bottom) toCoordinateFromView:self.mapView]; 
CLLocationCoordinate2D leftCoord = [self.mapView convertPoint:CGPointMake(0, mapPadding.left) toCoordinateFromView:self.mapView]; 

double latitudeSpanToBeAddedToTop = relativeFromCoord.latitude - topCoord.latitude; 
double longitudeSpanToBeAddedToRight = relativeFromCoord.latitude - rightCoord.latitude; 
double latitudeSpanToBeAddedToBottom = relativeFromCoord.latitude - bottomCoord.latitude; 
double longitudeSpanToBeAddedToLeft = relativeFromCoord.latitude - leftCoord.latitude; 

maxLatitude = maxLatitude + latitudeSpanToBeAddedToTop; 
minLatitude = minLatitude - latitudeSpanToBeAddedToBottom; 

maxLongitude = maxLongitude + longitudeSpanToBeAddedToRight; 
minLongitude = minLongitude - longitudeSpanToBeAddedToLeft; 

[self setMapRegionForMinLat:minLatitude minLong:minLongitude maxLat:maxLatitude maxLong:maxLongitude]; 
} 

-(void) setMapRegionForMinLat:(double)minLatitude minLong:(double)minLongitude maxLat:(double)maxLatitude maxLong:(double)maxLongitude { 

    MKCoordinateRegion region; 
    region.center.latitude = (minLatitude + maxLatitude)/2; 
    region.center.longitude = (minLongitude + maxLongitude)/2; 
    region.span.latitudeDelta = (maxLatitude - minLatitude); 
    region.span.longitudeDelta = (maxLongitude - minLongitude); 

    // MKMapView BUG: this snaps to the nearest whole zoom level, which is wrong- it doesn't respect the exact region you asked for. See http://stackoverflow.com/questions/1383296/why-mkmapview-region-is-different-than-requested 
    [self.mapView setRegion:region animated:YES]; 
}

来源

2011-02-26 11:02:52 Willster

如果只针对iOS的7个或更多，你现在可以使用：

- (void)showAnnotations:(NSArray *)annotations 
       animated:(BOOL)animated

来源

2013-12-04 09:04:45

所有完美的工作代码修改的答案。

//Zooming the ploted Area 
- (void)zoomToAnnotationsBounds:(NSArray *)latLongArray { 
     __block CLLocationDegrees minLatitude = DBL_MAX; 
     __block CLLocationDegrees maxLatitude = -DBL_MAX; 
     __block CLLocationDegrees minLongitude = DBL_MAX; 
     __block CLLocationDegrees maxLongitude = -DBL_MAX; 

     [latLongArray enumerateObjectsUsingBlock:^(NSString *latLongObj, NSUInteger latLongIdx, BOOL *stop) { 
      latLongObj = [latLongArray objectAtIndex:latLongIdx]; 
      NSArray *latLongPoint = [latLongObj componentsSeparatedByString:@","]; 

      double annotationLat = [[latLongPoint objectAtIndex:0] doubleValue]; 
      double annotationLong = [[latLongPoint objectAtIndex:1] doubleValue]; 
      minLatitude = fmin(annotationLat, minLatitude); 
      maxLatitude = fmax(annotationLat, maxLatitude); 
      minLongitude = fmin(annotationLong, minLongitude); 
      maxLongitude = fmax(annotationLong, maxLongitude); 
     }]; 

     [self setMapRegionForMinLat:minLatitude minLong:minLongitude maxLat:maxLatitude maxLong:maxLongitude]; 
} 


-(void) setMapRegionForMinLat:(double)minLatitude minLong:(double)minLongitude maxLat:(double)maxLatitude maxLong:(double)maxLongitude { 

    // pad our map by 10% around the farthest annotations 

    // we'll make sure that our minimum vertical span is about a kilometer 
    // there are ~111km to a degree of latitude. regionThatFits will take care of 
    // longitude, which is more complicated, anyway. 

    MKCoordinateRegion region; 
    region.center.latitude = (minLatitude + maxLatitude)/2; 
    region.center.longitude = (minLongitude + maxLongitude)/2; 

    region.span.latitudeDelta = (maxLatitude - minLatitude) * MAP_PADDING; 

    region.span.latitudeDelta = (region.span.latitudeDelta < MINIMUM_VISIBLE_LATITUDE) 
    ? MINIMUM_VISIBLE_LATITUDE 
    : region.span.latitudeDelta; 

    region.span.longitudeDelta = (maxLongitude - minLongitude) * MAP_PADDING; 

    MKCoordinateRegion scaledRegion = [regionsMapView regionThatFits:region]; 
    [regionsMapView setRegion:scaledRegion animated:YES]; 

}

来源

2014-08-25 12:24:25

这是一个古老的问题，我知道你可能不需要任何帮助。但是我只是把它放在那里，因为任何正在寻找方法的人现在都可以使用MKMapView以上的新方法。它既干净又容易。

宣言

SWIFT
func showAnnotations(_ annotations: [AnyObject]!, 
      animated animated: Bool) 
Objective-C的
- (void)showAnnotations:(NSArray *)annotations 
       animated:(BOOL)animated 
参数

注解要在地图上是可见的注释。如果您希望地图区域更改为动画，则为动画;如果您想让地图立即显示新区域，则为NO，否则为无动画。

讨论

调用此方法更新该区域属性的值和可能的其它属性来反映新的地图区域。

来源

2015-02-26 04:38:03 Matt

iOS MKMapView缩放以显示所有标记

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