ios - 用于 Google Places API 的 Objective-C + JSON Parse objectForKey

Question

我有这个：

    //request stuff
NSString *searchString = [NSString stringWithFormat:@"Sydney"];
NSString *urlString = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/place/textsearch/json?query=%@&sensor=true&key=mykeynotyours!",searchString];

NSURL *requestURL = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:(requestURL)];

//response
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSError *jsonParsingError = nil;
NSDictionary *locationResults = [NSJSONSerialization JSONObjectWithData:response options:0 error:&jsonParsingError];

NSLog(@"%@",locationResults);

这会吐出一些结果，其中第一个是我想要的结果，但我无法像使用其他 API 那样得到 lat 和 lng：

NSString *stringLatitude = [locationResults objectForKey:@"lat"];

我怀疑它正在寻找的键是“结果”键的一个子集，我不知道如何告诉它:-(

结果：

    2013-04-12 18:47:49.784 Test[26984:c07] {
"html_attributions" =     (
);
results =     (
            {
        "formatted_address" = "Sydney NSW, Australia";
        geometry =             {
            location =                 {
                lat = "-33.8674869";
                lng = "151.2069902";
            };
            viewport =                 {
                northeast =                     {
                    lat = "-33.4245981";
                    lng = "151.3426361";
                };
                southwest =                     {
                    lat = "-34.1692489";
                    lng = "150.502229";
                };
            };
        };

感谢任何指导！

Answer 1

您可以使用以下代码访问几何 lat 和 lang

NSString *stringLatitude = [[[[[locationResults objectForKey:@"results"] objectAtIndex:0] objectForKey:@"geometry"] objectForKey:@"location"] valueForKey:@"lat"];
NSString *stringLongitude = [[[[[locationResults objectForKey:@"results"] objectAtIndex:0] objectForKey:@"geometry"] objectForKey:@"location"] valueForKey:@"lng"];

Answer 2

用这个

 NSString *stringLatitude = [[[[[locationResults objectForKey:@"results" ]objectAtIndex:0] objectForKey:@"geometry"] objectForKey:@"location"] objectForKey:@"lat"];
 NSString *stringLongitude = [[[[[locationResults objectForKey:@"results" ]objectAtIndex:0] objectForKey:@"geometry"] objectForKey:@"location"] objectForKey:@"lng"];

Answer 3

使用 iOS 7？将此放入您的项目中：https ://github.com/gdyer/GDGooglePlaces

然后……就用这个- (id)initWithPlaceCategory:(NSString *)_category urlStub:(NSString *)_stub lat:(float)\ _lat andLon:(float)_lon;

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