也许有人可以提供帮助。我正在尝试在下面的 URL 中获取谷歌地图位置和纬度的位置名称。正如您从 JSON 中看到的那样，它首先打开结果，然后打开 address_components。我正在尝试获取 JSON 中的第一个 long_name 和 short_name 但下面的代码只给我 JSON 中的最后一个 long_name 和 short_name。
也许有人有某种想法，我在这个阶段已经尝试了所有方法，但似乎没有任何方法可以解决问题。
谢谢，
柯蒂斯B
-(void)getPlaceName
{
NSString *urlString = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/json?latlng=%f,%f&sensor=false",53.348623,-6.243089];
NSURL *url = [NSURL URLWithString:urlString];
//Next we need a NSURLSession instance
NSURLSession *session = [NSURLSession sharedSession];
//All tasks (there are three, see documentation) are created from an NSURLSession instance
//We want a DataTask
NSURLSessionDataTask *dataTask = [session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//This "block" (of code) will be executed when the call is complete
//Serialize the JSON to Foundation objects
NSDictionary *geocodeDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
//Parse through the JSON to get to where we want, address_components array
NSArray *resultsArray = geocodeDictionary[@"results"];
NSDictionary *resultsDictionary = resultsArray[1];
NSArray *addressComponents = resultsDictionary[@"address_components"];
//Declare variables to hold desired results
NSString *longName;
NSString *shortName;
//The address_components array contains many dictionaries,
//we loop through each dictionary and check the types array
for (NSDictionary *addressComponentDictionary in addressComponents) {
longName = addressComponentDictionary[@"long_name"];
shortName = addressComponentDictionary[@"short_name"];
}
//Test log to see we are correct
NSLog(@"Long name for GetAddress is: %@", longName);
NSLog(@"Short Name is: %@", shortName);
}];
[dataTask resume];
}
JSON 日志:
[8948:3198407] {
results = (
{
"address_components" = (
{
"long_name" = "National College of Ireland";
"short_name" = "National College of Ireland";
types = (
premise
);
},
{
"long_name" = "Mayor Street Lower";
"short_name" = "Mayor Street Lower";
types = (
route
);
},
{
"long_name" = "International Financial Services Centre";
"short_name" = "International Financial Services Centre";
types = (
"sublocality_level_1",
sublocality,
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
locality,
political
);
},
{
"long_name" = "Dublin 1";
"short_name" = "Dublin 1";
types = (
"postal_town"
);
},
{
"long_name" = "Dublin City";
"short_name" = "Dublin City";
types = (
"administrative_area_level_2",
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
"administrative_area_level_1",
political
);
},
{
"long_name" = Ireland;
"short_name" = IE;
types = (
country,
political
);
}
);
"formatted_address" = "National College of Ireland, Mayor Street Lower, International Financial Services Centre, Dublin 1, Ireland";
geometry = {
bounds = {
northeast = {
lat = "53.34914449999999";
lng = "-6.2420244";
};
southwest = {
lat = "53.3484171";
lng = "-6.2435218";
};
};
location = {
lat = "53.3487808";
lng = "-6.242773100000001";
};
"location_type" = ROOFTOP;
viewport = {
northeast = {
lat = "53.3501297802915";
lng = "-6.241424119708499";
};
southwest = {
lat = "53.3474318197085";
lng = "-6.244122080291502";
};
};
};
"place_id" = "ChIJ7fLaG40OZ0gRJsCRPZA1_iA";
types = (
premise
);
},
{
"address_components" = (
{
"long_name" = "Excise Walk";
"short_name" = "Excise Walk";
types = (
route
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
locality,
political
);
},
{
"long_name" = "Dublin City";
"short_name" = "Dublin City";
types = (
"administrative_area_level_2",
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
"administrative_area_level_1",
political
);
},
{
"long_name" = Ireland;
"short_name" = IE;
types = (
country,
political
);
}
);
"formatted_address" = "Excise Walk, Dublin, Ireland";
geometry = {
bounds = {
northeast = {
lat = "53.3492304";
lng = "-6.2434942";
};
southwest = {
lat = "53.3484317";
lng = "-6.243662899999999";
};
};
location = {
lat = "53.34883110000001";
lng = "-6.243578599999999";
};
"location_type" = "GEOMETRIC_CENTER";
viewport = {
northeast = {
lat = "53.3501800302915";
lng = "-6.242229569708497";
};
southwest = {
lat = "53.3474820697085";
lng = "-6.244927530291502";
};
};
};
"place_id" = "ChIJG_rIHI0OZ0gRHTz7pFf9r7o";
types = (
route
);
},
{
"address_components" = (
{
"long_name" = "North Dock";
"short_name" = "North Dock";
types = (
neighborhood,
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
locality,
political
);
},
{
"long_name" = "Dublin City";
"short_name" = "Dublin City";
types = (
"administrative_area_level_2",
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
"administrative_area_level_1",
political
);
},
{
"long_name" = Ireland;
"short_name" = IE;
types = (
country,
political
);
}
);
"formatted_address" = "North Dock, Dublin, Ireland";
geometry = {
bounds = {
northeast = {
lat = "53.3608191";
lng = "-6.1894282";
};
southwest = {
lat = "53.34522";
lng = "-6.2549399";
};
};
location = {
lat = "53.3497493";
lng = "-6.2306567";
};
"location_type" = APPROXIMATE;
viewport = {
northeast = {
lat = "53.3608191";
lng = "-6.1894282";
};
southwest = {
lat = "53.34522";
lng = "-6.2549399";
};
};
};
"place_id" = "ChIJr9h9M_oOZ0gRrycKzPZj46A";
types = (
neighborhood,
political
);
},
{
"address_components" = (
{
"long_name" = "Dublin Northside";
"short_name" = "Dublin Northside";
types = (
neighborhood,
political
);
},
{
"long_name" = Ashtown;
"short_name" = Ashtown;
types = (
"sublocality_level_1",
sublocality,
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
locality,
political
);
},
{
"long_name" = "Dublin City";
"short_name" = "Dublin City";
types = (
"administrative_area_level_2",
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
"administrative_area_level_1",
political
);
},
{
"long_name" = Ireland;
"short_name" = IE;
types = (
country,
political
);
}
);
"formatted_address" = "Dublin Northside, Ashtown, Dublin, Ireland";
geometry = {
bounds = {
northeast = {
lat = "53.4088667";
lng = "-6.0358715";
};
southwest = {
lat = "53.34558130000001";
lng = "-6.381769299999999";
};
};
location = {
lat = "53.3815507";
lng = "-6.1922052";
};
"location_type" = APPROXIMATE;
viewport = {
northeast = {
lat = "53.4088667";
lng = "-6.0358715";
};
southwest = {
lat = "53.34558130000001";
lng = "-6.381769299999999";
};
};
};
"place_id" = ChIJvUSkJbcPZ0gRyXXPH9MSQwk;
types = (
neighborhood,
political
);
},
{
"address_components" = (
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
locality,
political
);
},
{
"long_name" = "Dublin City";
"short_name" = "Dublin City";
types = (
"administrative_area_level_2",
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
"administrative_area_level_1",
political
);
},
{
"long_name" = Ireland;
"short_name" = IE;
types = (
country,
political
);
}
);
"formatted_address" = "Dublin, Ireland";
geometry = {
bounds = {
northeast = {
lat = "53.42521010000001";
lng = "-6.0439235";
};
southwest = {
lat = "53.22343009999999";
lng = "-6.4474846";
};
};
location = {
lat = "53.3498053";
lng = "-6.2603097";
};
"location_type" = APPROXIMATE;
viewport = {
northeast = {
lat = "53.42521010000001";
lng = "-6.0439235";
};
southwest = {
lat = "53.22343009999999";
lng = "-6.4474846";
};
};
};
"place_id" = ChIJL6wn6oAOZ0gRoHExl6nHAAo;
types = (
locality,
political
);
},
{
"address_components" = (
{
"long_name" = "Dublin City";
"short_name" = "Dublin City";
types = (
"administrative_area_level_2",
political
);
},
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
"administrative_area_level_1",
political
);
},
{
"long_name" = Ireland;
"short_name" = IE;
types = (
country,
political
);
}
);
"formatted_address" = "Dublin City, Co. Dublin, Ireland";
geometry = {
bounds = {
northeast = {
lat = "53.4111566";
lng = "-6.1131916";
};
southwest = {
lat = "53.2988569";
lng = "-6.3870807";
};
};
location = {
lat = "53.3603142";
lng = "-6.315054200000001";
};
"location_type" = APPROXIMATE;
viewport = {
northeast = {
lat = "53.4111566";
lng = "-6.1131916";
};
southwest = {
lat = "53.2988569";
lng = "-6.3870807";
};
};
};
"place_id" = ChIJv2RI7foRZ0gRwAKA8azHAAM;
types = (
"administrative_area_level_2",
political
);
},
{
"address_components" = (
{
"long_name" = Dublin;
"short_name" = Dublin;
types = (
"administrative_area_level_1",
political
);
},
{
"long_name" = Ireland;
"short_name" = IE;
types = (
country,
political
);
}
);
"formatted_address" = "Co. Dublin, Ireland";
geometry = {
bounds = {
northeast = {
lat = "53.6347257";
lng = "-5.9962748";
};
southwest = {
lat = "53.1781971";
lng = "-6.5468798";
};
};
location = {
lat = "53.3824769";
lng = "-6.3133674";
};
"location_type" = APPROXIMATE;
viewport = {
northeast = {
lat = "53.6347257";
lng = "-5.9962748";
};
southwest = {
lat = "53.1781971";
lng = "-6.5468798";
};
};
};
"place_id" = ChIJv2RI7foRZ0gRwAKA8azHABg;
types = (
"administrative_area_level_1",
political
);
},
{
"address_components" = (
{
"long_name" = Ireland;
"short_name" = IE;
types = (
country,
political
);
}
);
"formatted_address" = Ireland;
geometry = {
bounds = {
northeast = {
lat = "55.4351345";
lng = "-5.994700099999999";
};
southwest = {
lat = "51.4199312";
lng = "-10.66958";
};
};
location = {
lat = "53.41291";
lng = "-8.24389";
};
"location_type" = APPROXIMATE;
viewport = {
northeast = {
lat = "55.4351345";
lng = "-5.99471";
};
southwest = {
lat = "51.4199312";
lng = "-10.6694501";
};
};
};
"place_id" = "ChIJ-ydAXOS6WUgRCPTbzjQSfM8";
types = (
country,
political
);
}
);
status = OK; }
最佳答案
您的 for 循环遍历所有 address_components 并将它们的值分配给您的 longName 和 shortName 变量，因此当循环结束时只会存储数组中最后检索到的值。如果你只想要第一组那么你可能想要做这样的事情:
if ( addressComponents.count > 0 ) {
NSDictionary *componentDict = addressComponents[0];
longName = componentDict[@"long_name"];
shortName = componentDict[@"short_name"];
}
关于ios - NSDictionary 未获取第一项 JSON，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35577683/