Question

我正在使用MKMapView并在地图上添加了大量注释引脚，大约5-10公里。当我运行应用程序时，我的地图开始缩小以显示整个世界，缩放地图以使引脚适合视图的最佳方法是什么？

修改我最初的想法是使用MKCoordinateRegionMake并从我的注释中计算坐标中心，longitudeDelta和latitudeDelta。我很确定这会奏效，但我只是想检查一下我没有遗漏任何明显的东西。

添加了代码，BTW：FGLocation是一个符合MKAnnotation的类，locationFake是这些对象的NSMutableArray。评论总是受欢迎....

- (MKCoordinateRegion)regionFromLocations {
    CLLocationCoordinate2D upper = [[locationFake objectAtIndex:0] coordinate];
    CLLocationCoordinate2D lower = [[locationFake objectAtIndex:0] coordinate];

    // FIND LIMITS
    for(FGLocation *eachLocation in locationFake) {
        if([eachLocation coordinate].latitude > upper.latitude) upper.latitude = [eachLocation coordinate].latitude;
        if([eachLocation coordinate].latitude < lower.latitude) lower.latitude = [eachLocation coordinate].latitude;
        if([eachLocation coordinate].longitude > upper.longitude) upper.longitude = [eachLocation coordinate].longitude;
        if([eachLocation coordinate].longitude < lower.longitude) lower.longitude = [eachLocation coordinate].longitude;
    }

    // FIND REGION
    MKCoordinateSpan locationSpan;
    locationSpan.latitudeDelta = upper.latitude - lower.latitude;
    locationSpan.longitudeDelta = upper.longitude - lower.longitude;
    CLLocationCoordinate2D locationCenter;
    locationCenter.latitude = (upper.latitude + lower.latitude) / 2;
    locationCenter.longitude = (upper.longitude + lower.longitude) / 2;

    MKCoordinateRegion region = MKCoordinateRegionMake(locationCenter, locationSpan);
    return region;
}

Answer 1

这是我发现here对我有用的那个：

（编辑：我已经使用@Micah的建议更新了解决方案，将pointRect增加0.1，以确保rect不会最终变得极小！）

MKMapRect zoomRect = MKMapRectNull;
for (id <MKAnnotation> annotation in mapView.annotations)
{
    MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
    MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
    zoomRect = MKMapRectUnion(zoomRect, pointRect);
}
[mapView setVisibleMapRect:zoomRect animated:YES];

您还可以通过将第一行替换为：

来更新此选项以包含userLocation引脚

MKMapPoint annotationPoint = MKMapPointForCoordinate(mapView.userLocation.coordinate);
MKMapRect zoomRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);

Answer 2

Apple为IOS 7添加了一种新方法，以简化生活。

[mapView showAnnotations:yourAnnotationArray animated:YES];

您可以轻松地从存储在地图视图中的数组中提取：

yourAnnotationArray = mapView.annotations;

并快速调整相机！

mapView.camera.altitude *= 1.4;

除非用户安装了iOS 7+或OS X 10.9+，否则无法使用。看看自定义动画here

Answer 3

你做得对。

找出你的最大和最小纬度和经度，运用一些简单的算术，然后使用MKCoordinateRegionMake。

对于iOS 7及更高版本，请使用showAnnotations:animated:中的MKMapView.h：

// Position the map such that the provided array of annotations are all visible to the fullest extent possible. 
- (void)showAnnotations:(NSArray *)annotations animated:(BOOL)animated NS_AVAILABLE(10_9, 7_0);

Answer 4

我使用此代码并且对我来说很好用：

-(void)zoomToFitMapAnnotations:(MKMapView*)aMapView
{
    if([aMapView.annotations count] == 0)
        return;

    CLLocationCoordinate2D topLeftCoord;
    topLeftCoord.latitude = -90;
    topLeftCoord.longitude = 180;

    CLLocationCoordinate2D bottomRightCoord;
    bottomRightCoord.latitude = 90;
    bottomRightCoord.longitude = -180;

    for(MapViewAnnotation *annotation in mapView.annotations)
    {
        topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude);
        topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude);

        bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude);
        bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude);
    }

    MKCoordinateRegion region;
    region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5;
    region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5;
    region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1; // Add a little extra space on the sides
    region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1; // Add a little extra space on the sides

    region = [aMapView regionThatFits:region];
    [mapView setRegion:region animated:YES];
}

Answer 5

在Swift中使用

mapView.showAnnotations(annotationArray, animated: true)

在目标c

[mapView showAnnotations:annotationArray animated:YES];

Answer 6

@ jowie的解决方案效果很好。一个问题是，如果一个地图只有一个注释，你最终会得到一个完全缩小的地图。我向rect make size添加了0.1，以确保setVisibleMapRect可以放大。

MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);

Answer 7

Swift 3这是在地图中拟合所有注释的正确方法。

func zoomMapaFitAnnotations() {

        var zoomRect = MKMapRectNull
        for annotation in mapview.annotations {

            let annotationPoint = MKMapPointForCoordinate(annotation.coordinate)

            let pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0)

            if (MKMapRectIsNull(zoomRect)) {
                zoomRect = pointRect
            } else {
                zoomRect = MKMapRectUnion(zoomRect, pointRect)
            }
        }
        self.mapview.setVisibleMapRect(zoomRect, edgePadding: UIEdgeInsetsMake(50, 50, 50, 50), animated: true)

    }

Answer 8

如果您正在寻找 iOS 8及更高版本，最简单的方法是在调用var layoutMargins: UIEdgeInsets { get set }之前设置地图视图的func showAnnotations(annotations: [MKAnnotation], animated: Bool)

例如（Swift 2.1）：

@IBOutlet weak var map: MKMapView! {
    didSet {
        map.delegate = self
        map.mapType = .Standard
        map.pitchEnabled = false
        map.rotateEnabled = false
        map.scrollEnabled = true
        map.zoomEnabled = true
    }
}

// call 'updateView()' when viewWillAppear or whenever you set the map annotations
func updateView() {
    map.layoutMargins = UIEdgeInsets(top: 25, left: 25, bottom: 25, right: 25)
    map.showAnnotations(map.annotations, animated: true)
}

Answer 9

我已经转换了Rafael Moreira的答案。归功于他。对于那些寻找Swift版本的人来说，这里是代码：

accordion

Answer 10

我创建了一个扩展，使用swift中的一些代码来显示所有注释。如果即使在最大缩放级别也无法显示所有注释，则不会显示所有注释。

import MapKit

extension MKMapView {
    func fitAllAnnotations() {
        var zoomRect = MKMapRectNull;
        for annotation in annotations {
            let annotationPoint = MKMapPointForCoordinate(annotation.coordinate)
            let pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
            zoomRect = MKMapRectUnion(zoomRect, pointRect);
        }
        setVisibleMapRect(zoomRect, edgePadding: UIEdgeInsetsMake(20, 20, 20, 20), animated: true)
    }
}

Answer 11

在for循环中添加了此If循环，以从此方法中排除用户位置引脚（在我的情况下是必需的，也可能是其他人）

if (![annotation isKindOfClass:[MKUserLocation class]] ) {

//Code Here...

}

Answer 12

对于iOS 7及更高版本（参考MKMapView.h）：

// Position the map such that the provided array of annotations are all visible to the fullest extent possible.          

- (void)showAnnotations:(NSArray *)annotations animated:(BOOL)animated NS_AVAILABLE(10_9, 7_0);

来自Abhishek Bedi的评论

你只需致电：

 [yourMapView showAnnotations:@[yourAnnotation] animated:YES];

Answer 13

在Swift中

    var zoomRect = MKMapRectNull;

    for i in 0..<self.map.annotations.count {

        let annotation: MKAnnotation = self.map.annotations[i]

        let annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
        let pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
        zoomRect = MKMapRectUnion(zoomRect, pointRect);
    }

    self.map.setVisibleMapRect(zoomRect, animated: true)

Answer 14

正如Abhishek Bedi在评论中指出的那样，对于iOS7前锋来说，最好的办法是：

//from API docs: 
//- (void)showAnnotations:(NSArray *)annotations animated:(BOOL)animated NS_AVAILABLE(10_9, 7_0);
[self.mapView showAnnotations:self.mapView.annotations animated:YES];

对于我的个人项目（在iOS7之前），我只是在MKMapView类中添加了一个类别，用于封装“可见区域”功能以进行非常常见的操作：将其设置为能够查看所有当前加载的注释MKMapView实例（包括您可能放置的多个引脚，以及用户的位置）。结果是：

.h文件

#import <MapKit/MapKit.h>

@interface MKMapView (Extensions)

-(void)ij_setVisibleRectToFitAllLoadedAnnotationsAnimated:(BOOL)animated;
-(void)ij_setVisibleRectToFitAnnotations:(NSArray *)annotations animated:(BOOL)animated;


@end

.m文件

#import "MKMapView+Extensions.h"

@implementation MKMapView (Extensions)

/**
 *  Changes the currently visible portion of the map to a region that best fits all the currently loadded annotations on the map, and it optionally animates the change.
 *
 *  @param animated is the change should be perfomed with an animation.
 */
-(void)ij_setVisibleRectToFitAllLoadedAnnotationsAnimated:(BOOL)animated
{
    MKMapView * mapView = self;

    NSArray * annotations = mapView.annotations;

    [self ij_setVisibleRectToFitAnnotations:annotations animated:animated];

}


/**
 *  Changes the currently visible portion of the map to a region that best fits the provided annotations array, and it optionally animates the change.
    All elements from the array must conform to the <MKAnnotation> protocol in order to fetch the coordinates to compute the visible region of the map.
 *
 *  @param annotations an array of elements conforming to the <MKAnnotation> protocol, holding the locations for which the visible portion of the map will be set.
 *  @param animated    wether or not the change should be perfomed with an animation.
 */
-(void)ij_setVisibleRectToFitAnnotations:(NSArray *)annotations animated:(BOOL)animated
{
    MKMapView * mapView = self;

    MKMapRect r = MKMapRectNull;
    for (id<MKAnnotation> a in annotations) {
        ZAssert([a conformsToProtocol:@protocol(MKAnnotation)], @"ERROR: All elements of the array MUST conform to the MKAnnotation protocol. Element (%@) did not fulfill this requirement", a);
        MKMapPoint p = MKMapPointForCoordinate(a.coordinate);
        //MKMapRectUnion performs the union between 2 rects, returning a bigger rect containing both (or just one if the other is null). here we do it for rects without a size (points)
        r = MKMapRectUnion(r, MKMapRectMake(p.x, p.y, 0, 0));
    }

    [mapView setVisibleMapRect:r animated:animated];

}

@end

如您所见，到目前为止，我已添加了两种方法：一种用于将地图的可见区域设置为适合MKMapView实例上所有当前加载的注释的方法，另一种方法将其设置为任何数组对象因此，要设置mapView的可见区域，代码将如下所示：

   //the mapView instance  
    [self.mapView ij_setVisibleRectToFitAllLoadedAnnotationsAnimated:animated];

我希望它有帮助=）

Answer 15

    var zoomRect: MKMapRect = MKMapRectNull
    for annotation in mapView.annotations {
        let annotationPoint = MKMapPointForCoordinate(annotation.coordinate)
        let pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1)
        zoomRect = MKMapRectUnion(zoomRect, pointRect)
    }
    mapView.setVisibleMapRect(zoomRect, animated: true)

Answer 16

 - (void)zoomMapViewToFitAnnotationsWithExtraZoomToAdjust:(double)extraZoom
{

    if ([self.annotations count] == 0) return;

   int i = 0;
  MKMapPoint points[[self.annotations count]];

   for (id<MKAnnotation> annotation in [self annotations])
  {
      points[i++] = MKMapPointForCoordinate(annotation.coordinate);
   }

  MKPolygon *poly = [MKPolygon polygonWithPoints:points count:i];

MKCoordinateRegion r = MKCoordinateRegionForMapRect([poly boundingMapRect]);
r.span.latitudeDelta += extraZoom;
r.span.longitudeDelta += extraZoom;

[self setRegion: r animated:YES];

}

Answer 17

感谢jowie我已将旧类别更新为更优雅的解决方案。共享完整的，几乎复制和粘贴的解决方案

的MKMapView + AnnotationsRegion.h

#import <MapKit/MapKit.h>

@interface MKMapView (AnnotationsRegion)

-(void)updateRegionForCurrentAnnotationsAnimated:(BOOL)animated;
-(void)updateRegionForCurrentAnnotationsAnimated:(BOOL)animated edgePadding:(UIEdgeInsets)edgePadding;

-(void)updateRegionForAnnotations:(NSArray *)annotations animated:(BOOL)animated;
-(void)updateRegionForAnnotations:(NSArray *)annotations animated:(BOOL)animated edgePadding:(UIEdgeInsets)edgePadding;

@end

的MKMapView + AnnotationsRegion.m

#import "MKMapView+AnnotationsRegion.h"

@implementation MKMapView (AnnotationsRegion)

-(void)updateRegionForCurrentAnnotationsAnimated:(BOOL)animated{
    [self updateRegionForCurrentAnnotationsAnimated:animated edgePadding:UIEdgeInsetsZero];
}
-(void)updateRegionForCurrentAnnotationsAnimated:(BOOL)animated edgePadding:(UIEdgeInsets)edgePadding{
    [self updateRegionForAnnotations:self.annotations animated:animated edgePadding:edgePadding];
}

-(void)updateRegionForAnnotations:(NSArray *)annotations animated:(BOOL)animated{
    [self updateRegionForAnnotations:annotations animated:animated edgePadding:UIEdgeInsetsZero];
}
-(void)updateRegionForAnnotations:(NSArray *)annotations animated:(BOOL)animated edgePadding:(UIEdgeInsets)edgePadding{
    MKMapRect zoomRect = MKMapRectNull;
    for(id<MKAnnotation> annotation in annotations){
        MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
        MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
        zoomRect = MKMapRectUnion(zoomRect, pointRect);
    }
    [self setVisibleMapRect:zoomRect edgePadding:edgePadding animated:animated];
}

@end

希望它有所帮助，再次感谢jowie！

Answer 18

此页面上的所有答案假设地图占据全屏。我实际上有一个HUD显示器（即分散在顶部和底部的按钮），它们提供了地图上的信息..所以页面上的算法会显示引脚，但是其中一些会显示在< / em> HUD显示按钮。

我的解决方案将地图放大到显示屏幕的子集中的注释，适用于不同的屏幕尺寸（即3.5“vs 4.0”等）：< / p>
// create a UIView placeholder and throw it on top of the original mapview // position the UIView to fit the maximum area not hidden by the HUD display buttons // add an *other* mapview in that uiview, // get the MKCoordinateRegion that fits the pins from that fake mapview // kill the fake mapview and set the region of the original map // to that MKCoordinateRegion.

以下是我在代码中所做的事情（注意：我使用NSConstraints和一些辅助方法来使我的代码在不同的屏幕尺寸下工作..虽然代码很可读..我的回答here更好地解释..它基本上是相同的工作流程:)）

// position smallerMap to fit available space // don't store this map, it will slow down things if we keep it hidden or even in memory [@[_smallerMapPlaceholder] mapObjectsApplyingBlock:^(UIView *view) { [view removeFromSuperview]; [view setTranslatesAutoresizingMaskIntoConstraints:NO]; [view setHidden:NO]; [self.view addSubview:view]; }]; NSDictionary *buttonBindingDict = @{ @"mapPlaceholder": _smallerMapPlaceholder}; NSArray *constraints = [@[@"V:|-225-[mapPlaceholder(>=50)]-176-|", @"|-40-[mapPlaceholder(<=240)]-40-|" ] mapObjectsUsingBlock:^id(NSString *formatString, NSUInteger idx){ return [NSLayoutConstraint constraintsWithVisualFormat:formatString options:0 metrics:nil views:buttonBindingDict]; }]; [self.view addConstraints:[constraints flattenArray]]; [self.view layoutIfNeeded]; MKMapView *smallerMap = [[MKMapView alloc] initWithFrame:self.smallerMapPlaceholder.frame]; [_smallerMapPlaceholder addSubview:smallerMap]; MKCoordinateRegion regionThatFits = [smallerMap getRegionThatFits:self.mapView.annotations]; [smallerMap removeFromSuperview]; smallerMap = nil; [_smallerMapPlaceholder setHidden:YES]; [self.mapView setRegion:regionThatFits animated:YES];

这是获取适合区域的代码：

- (MKCoordinateRegion)getRegionThatFits:(NSArray *)routes { MKCoordinateRegion region; CLLocationDegrees maxLat = -90.0; CLLocationDegrees maxLon = -180.0; CLLocationDegrees minLat = 90.0; CLLocationDegrees minLon = 180.0; for(int idx = 0; idx < routes.count; idx++) { CLLocation* currentLocation = [routes objectAtIndex:idx]; if(currentLocation.coordinate.latitude > maxLat) maxLat = currentLocation.coordinate.latitude; if(currentLocation.coordinate.latitude < minLat) minLat = currentLocation.coordinate.latitude; if(currentLocation.coordinate.longitude > maxLon) maxLon = currentLocation.coordinate.longitude; if(currentLocation.coordinate.longitude < minLon) minLon = currentLocation.coordinate.longitude; } region.center.latitude = (maxLat + minLat) / 2.0; region.center.longitude = (maxLon + minLon) / 2.0; region.span.latitudeDelta = 0.01; region.span.longitudeDelta = 0.01; region.span.latitudeDelta = ((maxLat - minLat)<0.0)?100.0:(maxLat - minLat); region.span.longitudeDelta = ((maxLon - minLon)<0.0)?100.0:(maxLon - minLon); MKCoordinateRegion regionThatFits = [self regionThatFits:region]; return regionThatFits; }

Answer 19

我对MKMapView类别的 Rafael的代码进行了一些修改。

- (void)zoomToFitMapAnnotations {
    if ([self.annotations count] == 0)
        return;

    CLLocationCoordinate2D topLeftCoord;
    topLeftCoord.latitude = -90;
    topLeftCoord.longitude = 180;

    CLLocationCoordinate2D bottomRightCoord;
    bottomRightCoord.latitude = 90;
    bottomRightCoord.longitude = -180;

    for (id <MKAnnotation> annotation in self.annotations) {
        topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude);
        topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude);

        bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude);
        bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude);
    }

    MKCoordinateRegion region;
    region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5;
    region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5;
    region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1; // Add a little extra space on the sides
    region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1; // Add a little extra space on the sides

    [self setRegion:[self regionThatFits:region] animated:YES];
}

Answer 20

只是分享我对此的观察：

如果您使用的是xCode＆gt; 6＆＃34;推断＆＃34;故事板中的屏幕大小（参见＆＃34;模拟指标＆＃34;在文件检查器上），调用

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

viewDidLoad中的

将导致iPhone上4英寸的缩放级别太大，因为地图的布局仍然是故事板中较宽屏幕的大小。

您可以将来电转移至showAnnotations...至viewDidAppear。然后地图的大小已经调整到iPhone 4的较小屏幕。

或者更改值＆＃34;推断＆＃34;在＆＃34;模拟指标＆＃34;下的文件检查器中到iphone 4英寸。

Answer 21

根据上面的答案，您可以使用通用方法缩放地图，以同时适合所有注释和叠加。

-(MKMapRect)getZoomingRectOnMap:(MKMapView*)map toFitAllOverlays:(BOOL)overlays andAnnotations:(BOOL)annotations includeUserLocation:(BOOL)userLocation {
    if (!map) {
        return MKMapRectNull;
    }

    NSMutableArray* overlaysAndAnnotationsCoordinateArray = [[NSMutableArray alloc]init];        
    if (overlays) {
        for (id <MKOverlay> overlay in map.overlays) {
            MKMapPoint overlayPoint = MKMapPointForCoordinate(overlay.coordinate);
            NSArray* coordinate = @[[NSNumber numberWithDouble:overlayPoint.x], [NSNumber numberWithDouble:overlayPoint.y]];
            [overlaysAndAnnotationsCoordinateArray addObject:coordinate];
        }
    }

    if (annotations) {
        for (id <MKAnnotation> annotation in map.annotations) {
            MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
            NSArray* coordinate = @[[NSNumber numberWithDouble:annotationPoint.x], [NSNumber numberWithDouble:annotationPoint.y]];
            [overlaysAndAnnotationsCoordinateArray addObject:coordinate];
        }
    }

    MKMapRect zoomRect = MKMapRectNull;
    if (userLocation) {
        MKMapPoint annotationPoint = MKMapPointForCoordinate(map.userLocation.coordinate);
        zoomRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
    }

    for (NSArray* coordinate in overlaysAndAnnotationsCoordinateArray) {
        MKMapRect pointRect = MKMapRectMake([coordinate[0] doubleValue], [coordinate[1] doubleValue], 0.1, 0.1);
        zoomRect = MKMapRectUnion(zoomRect, pointRect);
    }

    return zoomRect;
}

然后：

MKMapRect mapRect = [self getZoomingRectOnMap:mapView toFitAllOverlays:YES andAnnotations:YES includeUserLocation:NO];
[mapView setVisibleMapRect:mapRect edgePadding:UIEdgeInsetsMake(10.0, 10.0, 10.0, 10.0) animated:YES];

Answer 22

您可以选择要与注释一起显示的形状。

extension MKMapView {
  func setVisibleMapRectToFitAllAnnotations(animated: Bool = true,
                                            shouldIncludeUserAccuracyRange: Bool = true,
                                            shouldIncludeOverlays: Bool = true,
                                            edgePadding: UIEdgeInsets = UIEdgeInsets(top: 35, left: 35, bottom: 35, right: 35)) {
    var mapOverlays = overlays

    if shouldIncludeUserAccuracyRange, let userLocation = userLocation.location {
      let userAccuracyRangeCircle = MKCircle(center: userLocation.coordinate, radius: userLocation.horizontalAccuracy)
      mapOverlays.append(MKOverlayRenderer(overlay: userAccuracyRangeCircle).overlay)
    }

    if shouldIncludeOverlays {
      let annotations = self.annotations.filter { !($0 is MKUserLocation) }
      annotations.forEach { annotation in
        let cirlce = MKCircle(center: annotation.coordinate, radius: 1)
        mapOverlays.append(cirlce)
      }
    }

    let zoomRect = MKMapRect(bounding: mapOverlays)
    setVisibleMapRect(zoomRect, edgePadding: edgePadding, animated: animated)
  }
}

extension MKMapRect {
  init(bounding overlays: [MKOverlay]) {
    self = .null
    overlays.forEach { overlay in
      let rect: MKMapRect = overlay.boundingMapRect
      self = self.union(rect)
    }
  }
}

Answer 23

@“我不确定这是否是因为我的实现中的一些其他因素，但我发现showAnnotations不像手动实现那样接近缩放/拟合注释，所以我已经坚持手册。 - Ted Avery 4月17日0:35“

我遇到了同样的问题，但之后我尝试了两次showAnnotations（如下所示），并且出于某种原因，它有效。

[mapView showAnnotations：yourAnnotationArray animated：YES]; [mapView showAnnotations：yourAnnotationArray animated：YES];

Answer 24

兼容iOS 7的方法是使用以下方法。首先调用showAnnotation以获取包含所有注释的矩形。然后使用引脚高度的顶部插图创建并UIEdgeInset。因此，您可以确保在地图上显示整个图钉。

[self.mapView showAnnotations:self.mapView.annotations animated:YES];
MKMapRect rect = [self.mapView visibleMapRect];
UIEdgeInsets insets = UIEdgeInsetsMake(pinHeight, 0, 0, 0);
[self.mapView setVisibleMapRect:rect edgePadding:insets animated:YES];

Answer 25

相应地将其放入您的代码中：

  - (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
    {
    id<MKAnnotation> mp = [annotationView annotation];
        MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate] ,250,250);

       [mv setRegion:region animated:YES];

}

缩放MKMapView以适合注释引脚？

25 个答案: