Question

我无法在XCode 4上调用类“MapAnnotation”。我正在进行编码，这将允许我将引脚放在MKMapView中。我相信我已经导入了合适的代表。这就是我所拥有的：

MillersLocations.h

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

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

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

@end

MillersLocations.m

#import "MillersLocations.h"

@implementation MillersLocations
@synthesize coordinate, title, subtitle;


-(void)dealloc{
    [title dealloc];
    [subtitle dealloc];
    [super dealloc];
}

@end

这是地图视图的视图控制器：

MapViewController.h

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

@interface MapViewController : UIViewController <MKMapViewDelegate> {
    IBOutlet MKMapView *mapView;

}

@end

MapViewController.m（只是我正在看的片段）

#import "MapViewController.h"
#import "MillersLocations.h"

@implementation MapViewController

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

    }
    return self;
}

//skipping forward

- (void)viewDidLoad
{
    [super viewDidLoad];

    MKCoordinateRegion store1;
    store1.center.latitude = 36.8605679;
    store1.center.longitude = -76.2866713;
    store1.span.latitudeDelta = 0.1;
    store1.span.longitudeDelta = 0.1;
    [mapView setRegion:store1 animated:YES];    

    //this is where I'm trying to put this code in:
    MapAnnotation* annotation = [[MapAnnotation alloc] initWithCoordinate:newCoord];
    //BUT "MapAnnotation" isn't an option
    }

我想知道我是否没有导入权限类或其他内容。我用谷歌搜索它，似乎无法找到“MapAnnotation”所在的位置。我需要导入什么才能访问“MapAnnotation”？在此之前一切正常。

感谢您的帮助。我只是在学习这些东西！

Answer 1

是什么让你觉得有一个名为MapAnnotation的课程？您的注记类称为MillersLocations。您需要创建该类的实例并调用[mapView addAnnotation:millersLocationInstance];（或类似的东西）。

尝试编码引脚位置时无法调用“MapAnnotation”

1 个答案: