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All annotations are not displayed to the user in MKMapView

I use MKMapViewand added some annotations to it. All annotations belong to another country, so I can’t set all the annotations visible to the user.

Please try below latitude and longitude for annotation.

First annotation Latitude: 23,029690

First annotation Longitude: 72.527359

Second annotation Latitude: 34,210855

Second annotation Longitude: -118.622636

Code to add annotation to mapview.

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

MyCustomAnnotation.m

#import "MyCustomAnnotation.h"

@implementation MyCustomAnnotation


#pragma mark - Custom Annotation View Setup
- (MKAnnotationView *)annotationView{

    MKAnnotationView *annotationView = [[MKAnnotationView alloc]initWithAnnotation:self reuseIdentifier:K_ID_CUSTOM_ANNOTATION];
    annotationView.enabled = YES;
    annotationView.canShowCallout = YES;
    annotationView.image = kImage(_strImageName);

    UIButton *button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    button.frame = CGRectMake(0, 0, 23, 23);
    button.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
    [button setImage:[[UIImage imageNamed:@"NextArrow"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forState:UIControlStateNormal];
    annotationView.rightCalloutAccessoryView = button;

    return annotationView;
}

- (id)initWithTitle:(NSString *)newTitle Subtitle:(NSString *)subTitle andDescritpion:(NSString *)titleDescritpion withLocation:(CLLocationCoordinate2D)location andImageName:(NSString*) strImageName andTagValue:(int) intTag{

    self = [super init];

    if(self){
        _title = newTitle;
        _subTitle = subTitle;
        _titleDescritpion = titleDescritpion;
        _coordinate = location;


        if ([strImageName intValue] == 1) {
            _strImageName = @"MapViewPinRed";

        }else if([strImageName intValue] == 2){
            _strImageName = @"MapViewPinOrange";

        }else if ([strImageName intValue] == 3){
            _strImageName = @"MapViewPinYellow";

        }else if ([strImageName intValue] == 4){
            _strImageName = @"MapViewPinLightGreen";

        }else{
            _strImageName = @"MapViewPinGreen";

        }
    }

    return self;
}

    @end

I tried to find the solution below, but it does not work.

1) Using 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];

2) Using showAnnotations

 [mapViewPledgeList showAnnotations:mapViewPledgeList.annotations animated:YES];

Problem: - offers any solution so that the entire annotation is saved for the user.

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4 answers

Q] .

  • , MKMapView.

  • Apple

    First annotation Latitude: 23,029690

    First annotation Longitude: 72.527359

    Second annotation Latitude: 34.210855

    Second annotation Longitude: -118.622636

. .

0

. ,

[self.mapView addAnnotation:point];
+2

mapView region, MKCoordinateRegion. , mapView region.

. , .

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

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

. .

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

. latitudeDelta longitudeDelta -

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

. span

MKCoordinateSpan span = MKCoordinateSpanMake(latitudeDelta, longitudeDelta);

. region mapView, -

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

There are several considerations when you're doing it, such as max / min latitudeDeltaand longitudeDeltayou want to support. This can be applied to step C when you are calculating the values.

Hope this helps.

+1
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You need to tell mapview to the ideal area so that all annotation notes are visible.

Below quick code will help you.

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)

    }
}
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Source: https://habr.com/ru/post/1677843/

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