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我试图检索我正在制作但收到以下错误的应用程序的经度和纬度坐标：

  2012-02-14 14:00:33.439 MapApp[13750:11c03] {
   "EVENT_NAME" = "TRIAL EVENT";
   lat = "38.671837";
    lng = "-77.349533";
 }
2012-02-14 14:00:40.759 MapApp[13750:11c03] -[__NSCFArray objectForKey:]: unrecognized       selector sent to instance 0x7955ea0
 2012-02-14 14:00:40.759 MapApp[13750:11c03] *** Terminating app due to uncaught exception    'NSInvalidArgumentException', reason: '-[__NSCFArray objectForKey:]: unrecognized selector    sent to instance 0x7955ea0'
  *** First throw call stack:
  (0x1728052 0x18b9d0a 0x1729ced 0x168ef00 0x168ece2 0x2680 0x56764e 0x582b89 0x5829bd    0x580f8a 0x580e2f 0x57effb 0x57f85a 0x568fbf 0x56921b 0x56a0f1 0x4d8fec 0x4de572 0x4d872b 0x2196 0x49f9d6 0x4a08a6 0x4af743 0x4b01f8 0x4a3aa9 0x1e38fa9 0x16fc1c5 0x1661022 0x165f90a   0x165edb4 0x165eccb 0x4a02a7 0x4a1a9b 0x20b8 0x2015 0x1)
  terminate called throwing an exception(gdb)

这是我的代码：

  - (void)viewDidLoad
 {
[super viewDidLoad];

NSString *urlString = [NSString stringWithFormat:jGETUrl];

NSURL *url = [NSURL URLWithString:urlString];

NSData *data = [NSData dataWithContentsOfURL:url];

NSError *error;

NSMutableArray *datas = (NSMutableArray*)[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

NSLog(@"%@", [datas objectAtIndex:0]);


NSNumber *latitude = [datas objectForKey:@"lat"];
NSLog(@"%@", [datas objectForKey:@"lat"]);
NSNumber *longitude =[datas objectForKey:@"lng"]; 
 NSLog(@"%@", [datas objectForKey:@"lng"]);
NSString *eventName =[datas objectForKey:@"EVENT_NAME"];
 NSLog(@"%@", [datas objectForKey:@"EVENT_NAME"]);

CLLocationCoordinate2D coordinate;
coordinate.latitude= latitude.doubleValue;
coordinate.longitude= longitude.doubleValue;
MyLocation *annotation =[[MyLocation alloc] initWithName:eventName address:eventName       coordinate:coordinate];
                         [_mapView addAnnotation:annotation];
 }

我不熟悉 JSON 和解析：我还尝试了以下组合

  - (void)viewDidLoad
 {
[super viewDidLoad];

NSString *urlString = [NSString stringWithFormat:jGETUrl];

NSURL *url = [NSURL URLWithString:urlString];

NSData *data = [NSData dataWithContentsOfURL:url];

NSError *error;

NSMutableArray *datas = (NSMutableArray*)[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

NSLog(@"%@", [datas objectAtIndex:0]);


NSNumber *latitude = [datas objectAtIndex:1];
NSLog(@"%@", [datas objectAtIndex:1]);
NSNumber *longitude =[datas objectAtIndex:2]; 
 NSLog(@"%@", [datas objectAtIndex:2]);
NSString *eventName =[datas objectAtIndex:3];
 NSLog(@"%@", [datas objectAtIndex:3]);

CLLocationCoordinate2D coordinate;
coordinate.latitude= latitude.doubleValue;
coordinate.longitude= longitude.doubleValue;
MyLocation *annotation =[[MyLocation alloc] initWithName:eventName address:eventName       coordinate:coordinate];
                         [_mapView addAnnotation:annotation];
 }

并且它为每个索引一起返回了事件名称、lat、lng。请帮忙..

4

1 回答 1

4

这是你的代码：

NSLog(@"%@",              [datas objectAtIndex:        0]);
NSNumber *latitude =      [datas objectForKey:         @"lat"];
                          ^^^^^^^^^^^^^^^^^^^^^

您必须决定datas是数组（可以使用objectAtIndex:）还是字典（可以使用objectForKey:）。您不能同时使用两者，因为一个对象不能同时是NSArrayAND NSDictionary。

-[__NSCFArray objectForKey:]: unrecognized selector而从异常datas信息objectForKey:（

你应该尝试这样的事情：

NSDictionary *dict = [datas objectAtIndex:0];
NSNumber *latitude = [dict objectForKey:@"lat"];
于 2012-02-14T21:01:29.887 回答