ios - 来自 JSON 的地图注解——没有注解显示

Question

我需要从一个 JSON 文件 atURL 中读取并为每个“名称、纬度、经度”做一个注释。这是到目前为止我得到的代码，它可以编译但不显示任何内容。和想法？

IOS6，故事板

_ 添加代码 _

视图控制器.h

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


@interface ViewController : UIViewController {}

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

@property (nonatomic, strong) NSMutableData *downloadData;

@end

视图控制器.m

#import "ViewController.h"
#import "MapViewAnnotation.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    _downloadData = [NSMutableData new];

    NSURL *requestURL = [NSURL URLWithString:@"OMITTED/apptest/locations.json"];
    NSURLRequest *request = [NSURLRequest requestWithURL:requestURL];
    NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
    [connection start];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [_downloadData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    id parsed = [NSJSONSerialization JSONObjectWithData:_downloadData options:kNilOptions error:nil];
    for (NSDictionary *pointInfo in parsed)
    {
        NSLog([parsed objectForKey:@"name"]);
        double xCoord = [(NSNumber*)[parsed objectForKey:@"lat"] doubleValue];
        double yCoord = [(NSNumber*)[parsed objectForKey:@"lon"] doubleValue];
        CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(xCoord, yCoord);


        MKPointAnnotation *point = [MKPointAnnotation new];
        point.coordinate = coords;
        point.title = [parsed objectForKey:@"name"];

        [self.mapView addAnnotation:point]; // or whatever your map view's variable name is
    }
}

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

-(void)viewDidUnload {
    [super viewDidUnload];
    // ARC Problem --- [_mapView release];
    self.mapView = nil;
}

@end

**来自 NSLog 对 _downloadData 的响应

来自 _downloadData 的字符串 =

{
    "name": "Waipio"
    "address": "100 oak"
    "lat": "28.00"
    "lon": "-125.00"
    "phonenumber": "555"
}
{
    "name": "Murrietta"
    "address": "100 Elm"
    "lat": "83.560852"
    "lon": "-134.135674"
    "phonenumber": "555"
}