Ios 用户在MKMapView中看不到所有注释

我正在使用

MKMapView

，并在地图上添加了许多注释插脚。所有注释都属于不同的国家，所以我无法将所有注释设置为用户可见

请尝试使用以下纬度和经度进行注释

第一个注释纬度：

23.029690

第一个注释经度：

72.527359

Second注解纬度：

34.210855

第二个注释经度：

-118.622636

将注释添加到地图视图的代码。

CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake([[dicObjects valueForKey:K_Latitude] doubleValue], [[dicObjects valueForKey:K_Longitude] doubleValue]);
MyCustomAnnotation *myCustomAnnotation = [[MyCustomAnnotation alloc]initWithTitle:[NSString stringWithFormat:@"%@           ",[dicObjects valueForKey:K_Title]] Subtitle:[NSString stringWithFormat:@"%@",[dicObjects valueForKey:K_SubTitle]] andDescritpion:[NSString stringWithFormat:@"%@",[dicObjects valueForKey:K_TitelDes]] withLocation:coordinate andImageName:[dicObjects valueForKey:K_Rating] andTagValue:intTempCounter];
[mapViewPledgeList addAnnotation:myCustomAnnotation];

MyCustomAnnotation.h

@interface MyCustomAnnotation : NSObject<MKAnnotation>

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (copy, nonatomic) NSString *title;
@property (copy, nonatomic) NSString *subTitle;
@property (copy, nonatomic) NSString *titleDescritpion;
@property (copy, nonatomic) NSString *strImageName;
@property  int intTagValue;


- (id)initWithTitle:(NSString *)newTitle Subtitle:(NSString *)subTitle andDescritpion:(NSString *)titleDescritpion withLocation:(CLLocationCoordinate2D)location andTagValue:(int) intTag;
- (MKAnnotationView *)annotationView;
- (id)initWithTitle:(NSString *)newTitle Subtitle:(NSString *)subTitle andDescritpion:(NSString *)titleDescritpion withLocation:(CLLocationCoordinate2D)location andImageName:(NSString*) strImageName andTagValue:(int) intTag;
@end

我尝试了下面的解决方案，但它不起作用。

CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake([[dicObjects valueForKey:K_Latitude] doubleValue], [[dicObjects valueForKey:K_Longitude] doubleValue]);
MyCustomAnnotation *myCustomAnnotation = [[MyCustomAnnotation alloc]initWithTitle:[NSString stringWithFormat:@"%@           ",[dicObjects valueForKey:K_Title]] Subtitle:[NSString stringWithFormat:@"%@",[dicObjects valueForKey:K_SubTitle]] andDescritpion:[NSString stringWithFormat:@"%@",[dicObjects valueForKey:K_TitelDes]] withLocation:coordinate andImageName:[dicObjects valueForKey:K_Rating] andTagValue:intTempCounter];
[mapViewPledgeList addAnnotation:myCustomAnnotation];

1） 使用

MKMapRectUnion

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

---

问题：-建议任何解决方案，以便所有注释对用户可见。

不要忘记向地图添加注释。也许这就是问题所在

[self.mapView addAnnotation:point]; 

---

您需要告诉

mapView

类型为

MKCoordinateRegion

的

区域的正确值。在告诉
mapView
显示正确的
区域之前，您需要进行一些计算

A.通过删除所有可用的坐标数组，找出以下变量的值

CLLocationDegrees minLatitude = // To be calculated
CLLocationDegrees maxLatitude = // To be calculated

CLLocationDegrees minLongitude = // To be calculated
CLLocationDegrees maxLongitude = // To be calculated

B.计算地图的中心坐标

CLLocationCoordinate2D center = 
CLLocationCoordinate2DMake((maxLatitude+minLatitude)/2, (maxLongitude+minLongitude)/2);

C.计算
latitudelta
和
longitudeDelta
值-

CLLocationDegrees latitudeDelta = ABS(maxLatitude-minLatitude)*2;
CLLocationDegrees longitudeDelta = ABS(maxLongitude-minLongitude)*2;

D.计算
span

MKCoordinateSpan span = MKCoordinateSpanMake(latitudeDelta, longitudeDelta);

E.计算
区域
，并告诉您的
地图视图
显示该区域-

MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
[mapView setRegion:region animated:YES];

执行此操作时还有一些其他注意事项，例如希望支持的最大/最小
latitudelta
和
longitudeDelta
。计算值时，可将其应用于步骤C

希望这有帮助。
您需要通知mapview以完善区域，以便所有注释接点都可见

下面的swift代码帮助您

extension MKMapView {
    func getAllAnnotationExpectCurrntLocation() -> [MKAnnotation] {
        var arrAnnotion: [MKAnnotation] = self.annotations
        arrAnnotion = arrAnnotion.filter { $0 !== self.userLocation }
        return arrAnnotion
    }

    func zoomToFitMapAnnotations() {
        guard self.annotations.count != 0 else {
            return
        }

        var topLeftCordinate = CLLocationCoordinate2D(latitude: -90, longitude: 180)
        var bottomRightCordinate = CLLocationCoordinate2D(latitude: 90, longitude: -180)

        for ann in self.getAllAnnotationExpectCurrntLocation() {
            topLeftCordinate.longitude = fmin(topLeftCordinate.longitude, ann.coordinate.longitude)
            topLeftCordinate.latitude = fmax(topLeftCordinate.latitude, ann.coordinate.latitude)

            bottomRightCordinate.longitude = fmax(bottomRightCordinate.longitude, ann.coordinate.longitude)
            bottomRightCordinate.latitude = fmin(bottomRightCordinate.latitude, ann.coordinate.latitude)
        }

        let latitude = topLeftCordinate.latitude - ((topLeftCordinate.latitude - bottomRightCordinate.latitude) * 0.5)
        let longitude = topLeftCordinate.longitude + ((bottomRightCordinate.longitude - topLeftCordinate.longitude) * 0.5)

        let latitudeDelta = fabs(topLeftCordinate.latitude - bottomRightCordinate.latitude) * 1.1
        let longitudeDelta = fabs(bottomRightCordinate.longitude - topLeftCordinate.longitude) * 1.1
        let span: MKCoordinateSpan = MKCoordinateSpan(latitudeDelta: latitudeDelta, longitudeDelta: longitudeDelta)

        let centerCordinate: CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
        let region: MKCoordinateRegion = MKCoordinateRegion(center: centerCordinate, span: span)
        let newregion = self.regionThatFits(region)
        self.setRegion(newregion, animated: true)

    }
}

Q] 所有注释对用户保持可见


遗憾的是，无法将最小缩放级别设置为小于MKMapView最小限制

同时在苹果官方地图应用程序中，下方的点不可见

第一个注释纬度：
23.029690

第一个注释经度：
72.527359

Second注解纬度：
34.210855

第二个注释经度：
-118.622636


注意：在地图视图达到最小限制后，我们无法放大地图视图。
注释已放置在地图中，但所有注释都不同时可见。我误解了问题@Hiteshsuranitell me关于“ZoomTofitPanNotations”的问题，无法修复地图以查看地图上的所有注释。在最小放大级别后，无法放大地图视图
CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake([[dicObjects valueForKey:K_Latitude] doubleValue], [[dicObjects valueForKey:K_Longitude] doubleValue]);
MyCustomAnnotation *myCustomAnnotation = [[MyCustomAnnotation alloc]initWithTitle:[NSString stringWithFormat:@"%@           ",[dicObjects valueForKey:K_Title]] Subtitle:[NSString stringWithFormat:@"%@",[dicObjects valueForKey:K_SubTitle]] andDescritpion:[NSString stringWithFormat:@"%@",[dicObjects valueForKey:K_TitelDes]] withLocation:coordinate andImageName:[dicObjects valueForKey:K_Rating] andTagValue:intTempCounter];
[mapViewPledgeList addAnnotation:myCustomAnnotation];