用户无法在MKMapView中看到所有注释

问题描述

我正在使用MKMapView，并且已在地图上添加了许多注释图钉.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对用户可见.

I am using MKMapView and have added a number of annotation pins to the map. All annotation belong to different country, so i do not able to set all annotation visible to user.

请尝试使用以下经度和纬度进行注释.

Please do try using below latitude and longitude for annotation.

First annotation Latitude: 23.029690

First annotation Latitude:23.029690

First annotation Longitude: 72.527359

First annotation Longitude: 72.527359

Second annotation Latitude: 34.210855

Second annotation Latitude:34.210855

Second annotation Longitude: -118.622636

Second annotation Longitude: -118.622636

用于向地图视图添加注释的代码.

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

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

我尝试使用以下解决方案，但无法正常工作.

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];

2)使用showAnnotations

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

问题:-建议任何解决方案，以便所有注释对用户保持可见.

Issue:- suggest any solution so all annotation keep visible to user.

推荐答案

Q]所有注释对用户保持可见.

Q] All annotation keep visible to user.

• 很遗憾，无法将最小缩放级别设置为小于MKMapView的最小限制.

• Unfortunately, it is not possible to set minimum zoom level less then the MKMapView minimum limit.

在以下点的苹果官方地图应用程序中也不同时可见

Also in apple official map application below point is not visible at same time

First annotation Latitude: 23.029690

First annotation Latitude:23.029690

First annotation Longitude: 72.527359

First annotation Longitude: 72.527359

Second annotation Latitude: 34.210855

Second annotation Latitude: 34.210855

Second annotation Longitude: -118.622636

Second annotation Longitude: -118.622636

注意:在达到最小限制后，我们无法放大地图视图.

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