Mapview不显示引脚注释中的标题或副标题 [英] Mapview not displaying Title or subtitle from pin annotation

问题描述

App返回错误。但它不会崩溃。它只是没有显示标题或副标题。

App returns error when clicking the annotation pin. However it does not crash. It just does not show the title or subtitle.

错误是（lldb）然后列出一串数字，如0x3516b5a0。

Error is (lldb) then list a string of numbers like 0x3516b5a0.

plist示例：

<dict>
        <key>cellName</key>
        <string>Abingdon Lodge No. 48</string>
        <key>cellSubtitle</key>
        <string>Abingdon, VA</string>
        <key>address</key>
        <string>325 W Main Street Abingdon, Virginia 24210</string>
        <key>latitude</key>
        <real>36.708649</real>
        <key>longitude</key>
        <real>-81.981184</real>
        <key>webSite</key>
        <string>http://www.grandlodgeofvirginia.org/lodges/48/</string>
        <key>statedCom</key>
        <string>Abingdon Lodge No. 48 holds it&apos;s stated communication on the 2nd Monday of the month at 7:30 PM. If there are any exceptions to the regular meeting day or time, they are posted on the Lodge website.</string>
        <key>history</key>
        <string>According to the earliest records the Abingdon Lodge had its origin "At a meeting held at the house of James White in the town.</string>
    </dict>

MapviewController.M

- (void)viewDidLoad
{

    // Do any additional setup after loading the view, typiclly from a nib.
    //Create the region
    MKCoordinateRegion myRegion;

    //Center
    CLLocationCoordinate2D center;
    center.latitude = VA_LATITUDE;
    center.longitude = VA_LONGITUDE;

    //Span
    MKCoordinateSpan span;
    span.latitudeDelta = THE_SPAN;
    span.longitudeDelta = THE_SPAN;

    myRegion.center = center;
    myRegion.span = span;


    //Set our mapView
    [myMapView setRegion:myRegion animated:YES];


    NSString *path = [[NSBundle mainBundle] pathForResource:@"lodges" ofType:@"plist"];
    NSMutableArray* lodgelist = [[NSMutableArray alloc] initWithContentsOfFile:path];

    for(int i = 0; i < [lodgelist count]; i++) {
        float realLatitude = [[[lodgelist objectAtIndex:i] objectForKey:@"latitude"] floatValue];
        float realLongitude = [[[lodgelist objectAtIndex:i] objectForKey:@"longitude"] floatValue];

        CLLocationCoordinate2D mypoint;
        mypoint.latitude = realLatitude;
        mypoint.longitude = realLongitude;
        Annotation *lodgepoint =[Annotation alloc];
        lodgepoint.coordinate = mypoint;
        lodgepoint.title = [[lodgelist objectAtIndex:i] objectForKey:@"cellName"];
        lodgepoint.subtitle = [[lodgelist objectAtIndex:i] objectForKey:@"cellSubtitle"];
        [self.myMapView addAnnotation:lodgepoint];


    }



}

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

@end

MapViewController.h

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

@interface AWCMapViewController : UIViewController

@property (strong, nonatomic) IBOutlet MKMapView *myMapView;

-(IBAction)findmylocation:(id)sender;
-(IBAction)setmaptype:(id)sender;

@property (strong, nonatomic) NSArray *tabledata;


@end

推荐答案

@interface Annotation : NSObject <MKAnnotation>

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

我不得不将标题从分配更改为副本。 ：P

I had to change the title from assign to copy. :P

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