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标题: ios - MKPinAnnotationView 不起作用 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 00:42
标题: ios - MKPinAnnotationView 不起作用

我想要一个 MKMapView 显示带有公开按钮的注释，这些注释会导致像 the Golden Gate Bridge annotation in this Apple sample app 这样的 View Controller .

我从 plist 加载坐标，注释正确显示为标题/副标题，但方法

- (MKAnnotationView *)mapViewMKMapView *)theMapView viewForAnnotationid <MKAnnotation>)annotation

没有效果。

我想我必须以某种方式将注释与 pinannotations 联系起来？

MapViewController.h:

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "Annotation.h"

@interface MapViewController : UIViewController<CLLocationManagerDelegate, MKMapViewDelegate>

@property (strong, nonatomic) CLLocationManager *location;
@property (nonatomic, retain) NSArray *data;    
@end

MapViewController.m:

#import "MapViewController.h"

@interface MapViewController ()
@property (nonatomic, weak) IBOutlet MKMapView *mapView;
@end

@implementation MapViewController
@synthesize data;
@synthesize location, minLatitude, maxLatitude, minLongitude, maxLongitude;

- (void)viewDidLoad
{
    NSString *dataPath = [[NSBundle mainBundle] pathForResource"City" ofType"plist"];
    self.data = [NSArray arrayWithContentsOfFile:dataPath];

    for (int i = 0; i < data.count; i++) {

        NSDictionary *dataItem = [data objectAtIndex:i];

        //Create Annotation
        Annotation *building = [[Annotation alloc] init];
        building.title = [dataItem objectForKey"Title"];
        building.subtitle = [dataItem objectForKey"Subtitle"];

        MKCoordinateRegion buildingcoordinates = { {0.0, 0.0}, {0.0, 0.0} };
        buildingcoordinates.center.latitude = [[dataItem objectForKey"Latitude"] floatValue];
        buildingcoordinates.center.longitude = [[dataItem objectForKey"Longitude"] floatValue];

        building.coordinate = buildingcoordinates.center;
        [self.mapView addAnnotation:building];

    }

    [super viewDidLoad];

}

- (MKAnnotationView *)mapViewMKMapView *)theMapView viewForAnnotationid <MKAnnotation>)annotation
{
    if ([annotation isKindOfClass:[MKUserLocation class]])
        return nil;

        static NSString *pinIdentifier = @"pinIndentifier";

        MKPinAnnotationView *pinView = (MKPinAnnotationView *)
        [self.mapView dequeueReusableAnnotationViewWithIdentifier:pinIdentifier];
        if (pinView == nil)
        {
            // if an existing pin view was not available, create one
            MKPinAnnotationView *customPinView = [[MKPinAnnotationView alloc]
                                                  initWithAnnotation:annotation reuseIdentifier:pinIdentifier];
            customPinView.pinColor = MKPinAnnotationColorPurple;
            customPinView.animatesDrop = YES;
            customPinView.canShowCallout = YES;

            UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
            [rightButton addTarget:self
                            actionselector(showDetails
                  forControlEvents:UIControlEventTouchUpInside];
            customPinView.rightCalloutAccessoryView = rightButton;

            return customPinView;
        }
        else
        {
            pinView.annotation = annotation;
        }
        return pinView;
}

Annotation.h:

#import <Foundation/Foundation.h>
#import <MapKit/MKAnnotation.h>

@interface Annotation : NSObject <MKAnnotation> {
    CLLocationCoordinate2D coordinate;
    NSString *title;
    NSString *subtitle;
}

@property(nonatomic, assign) CLLocationCoordinate2D coordinate;
@property(nonatomic, copy) NSString *title;
@property(nonatomic, copy) NSString *subtitle;

@end

Annotation.m:

#import "Annotation.h"

@implementation Annotation

@synthesize coordinate, title, subtitle;

@end

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Best Answer-推荐答案

很可能 map View 的 delegate 没有设置，这意味着 viewForAnnotation 委托(delegate)方法将不会被调用。

由于您已将 mapView 声明为 IBOutlet，因此在 xib 中，请确保 map View 的 delegate 已连接到 File's Owner。

或者，在 MapViewController 中 viewDidLoad 方法的顶部，以编程方式设置它:

mapView.delegate = self;

关于ios - MKPinAnnotationView 不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14616622/

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