Question

我正在尝试为我的简单地图视图创建自定义注释，但是当我运行模拟器时，annotaiton引脚没有显示在地图上。

我有一个实现MKAnnotation协议的MapViewAnnotation类，我有另一个MapViewController类，我以编程方式创建mapView并显示地图。

MapViewAnnotation.h：

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface MapViewAnnotation : NSObject <MKAnnotation>

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

-(id) initWithTitle: (NSString *) title AndCoordinate: (CLLocationCoordinate2D) coordinate;

@end

MapViewAnnotation.m：

#import "MapViewAnnotation.h"

@implementation MapViewAnnotation

@synthesize coordinate = _coordinate;
@synthesize title = _title;

-(id) initWithTitle:(NSString *)title AndCoordinate:(CLLocationCoordinate2D)coordinate{
    self = [super init];
    _title = title;
    _coordinate = coordinate;
    return self; 
}
@end

MapViewController.h：

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

@interface MapViewController : UIViewController

@property (weak, nonatomic) MKMapView *mapView;

-(void) goToLocation;
@end

MapViewController.m：

#import "MapViewController.h"
#import "MapViewAnnotation.h"

#define LATITUDE 42.3889;
#define LONGITUDE -72.5278;


@interface MapViewController ()

@end

@implementation MapViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.mapView = [[MKMapView alloc] initWithFrame:self.view.frame];
    [self.view addSubview:self.mapView];
    [self goToLocation];
    [self.mapView addAnnotations:[self createAnnotations]];

}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void) goToLocation {
    MKCoordinateRegion newRegion;

    newRegion.center.latitude = LATITUDE;
    newRegion.center.longitude = LONGITUDE;

    newRegion.span.latitudeDelta = 0.05f;
    newRegion.span.longitudeDelta = 0.05f;

    self.mapView.showsPointsOfInterest = YES;
    [self.mapView setRegion:newRegion animated:YES];
}


-(NSMutableArray *) createAnnotations {

    NSMutableArray *annotations = [[NSMutableArray alloc] init];

    NSString *path = [[NSBundle mainBundle] pathForResource:@"location" ofType:@"plist"];

    NSArray *locations = [NSArray arrayWithContentsOfFile:path];

    for (NSDictionary *row in locations){
        NSNumber *latitude = [row objectForKey:@"latitude"];
        NSNumber *longitude = [row objectForKey:@"longitude"];
        NSString *title = [row objectForKey:@"title"];

        CLLocationCoordinate2D coord;
        coord.latitude = latitude.doubleValue;
        coord.longitude = longitude.doubleValue;

        MapViewAnnotation *annotation = [[MapViewAnnotation alloc] initWithTitle:title AndCoordinate:coord];
        [annotations addObject: annotation];
    }

    return annotations;


}
@end

我正在通过一个plist，我有一个测试位置的坐标，我试图在地图上显示，但是图钉没有显示在地图上。我再次以编程方式执行此操作，没有xib或故事板（尽管这应该不是问题）。

我不知道为什么注释没有显示出来。我尝试在堆栈上寻找其他一些情况，比如我的，但不幸的是找不到任何可能有用的东西。

谢谢。

Answer 1

答案很简单，

在我的plist中，我有坐标

latitude: 42.37
longitude: 72.536

实际上它应该是-72.536经度。

MKAnnotation不显示在地图视图上

1 个答案: