[Objective-C] Json encodage des caractères

Bonjour à tous et à toutes,

J'utilise le web service de google pour recuperer un fichier json de l'ensemble des adresses correspondant à une adresse donné.
Par exemple, si je donne comme adresse "maréchal", le fichier json ressemblera à:

Code:

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{
   "results" : [
      {
         "address_components" : [
            {
               "long_name" : "Maréchal",
               "short_name" : "Maréchal",
               "types" : [ "route" ]
            },
            {
               "long_name" : "Đà Lạt",
               "short_name" : "Đà Lạt",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Lâm Đồng",
               "short_name" : "Lâm Đồng",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "Vietnam",
               "short_name" : "VN",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "Maréchal, Đà Lạt, Lâm Đồng, Vietnam",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : 11.94303140,
                  "lng" : 108.43560040
               },
               "southwest" : {
                  "lat" : 11.93445870,
                  "lng" : 108.42697040
               }
            },
            "location" : {
               "lat" : 11.93943890,
               "lng" : 108.43027350
            },
            "location_type" : "GEOMETRIC_CENTER",
            "viewport" : {
               "northeast" : {
                  "lat" : 11.94303140,
                  "lng" : 108.43560040
               },
               "southwest" : {
                  "lat" : 11.93445870,
                  "lng" : 108.42697040
               }
            }
         },
         "types" : [ "route" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "Maréchal",
               "short_name" : "Maréchal",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Mangues-Quatre Vents",
               "short_name" : "Mangues-Quatre Vents",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "Rodrigues",
               "short_name" : "Rodrigues",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "Maurice",
               "short_name" : "MU",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "Maréchal, Maurice",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : -19.72615020,
                  "lng" : 63.40076920
               },
               "southwest" : {
                  "lat" : -19.73281550,
                  "lng" : 63.39029790
               }
            },
            "location" : {
               "lat" : -19.72921130,
               "lng" : 63.39625740
            },
            "location_type" : "APPROXIMATE",
            "viewport" : {
               "northeast" : {
                  "lat" : -19.72615020,
                  "lng" : 63.40076920
               },
               "southwest" : {
                  "lat" : -19.73281550,
                  "lng" : 63.39029790
               }
            }
         },
         "types" : [ "locality", "political" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "Marechal",
               "short_name" : "Marechal",
               "types" : [ "route" ]
            },
            {
               "long_name" : "Corrientes",
               "short_name" : "Corrientes",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Département Capital",
               "short_name" : "Département Capital",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "Corrientes",
               "short_name" : "Corrientes",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "Argentine",
               "short_name" : "AR",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "Marechal, Corrientes, Argentine",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : -27.468480,
                  "lng" : -58.78616629999999
               },
               "southwest" : {
                  "lat" : -27.469150,
                  "lng" : -58.792260
               }
            },
            "location" : {
               "lat" : -27.469020,
               "lng" : -58.78868000000001
            },
            "location_type" : "GEOMETRIC_CENTER",
            "viewport" : {
               "northeast" : {
                  "lat" : -27.46746601970850,
                  "lng" : -58.78616629999999
               },
               "southwest" : {
                  "lat" : -27.47016398029150,
                  "lng" : -58.792260
               }
            }
         },
         "types" : [ "route" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "Marechal",
               "short_name" : "Marechal",
               "types" : [ "route" ]
            },
            {
               "long_name" : "Salta",
               "short_name" : "Salta",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Capital",
               "short_name" : "Capital",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "Salta",
               "short_name" : "Salta",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "Argentine",
               "short_name" : "AR",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "Marechal, Salta, Argentine",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : -24.77584850,
                  "lng" : -65.45101020
               },
               "southwest" : {
                  "lat" : -24.77879340,
                  "lng" : -65.45294659999999
               }
            },
            "location" : {
               "lat" : -24.77719160,
               "lng" : -65.45206349999999
            },
            "location_type" : "GEOMETRIC_CENTER",
            "viewport" : {
               "northeast" : {
                  "lat" : -24.77584850,
                  "lng" : -65.45062941970849
               },
               "southwest" : {
                  "lat" : -24.77879340,
                  "lng" : -65.45332738029151
               }
            }
         },
         "types" : [ "route" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "Marechal",
               "short_name" : "Marechal",
               "types" : [ "route" ]
            },
            {
               "long_name" : "Paraná",
               "short_name" : "Paraná",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Département de Paraná",
               "short_name" : "Département de Paraná",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "Province d'Entre Ríos",
               "short_name" : "Province d'Entre Ríos",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "Argentine",
               "short_name" : "AR",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "Marechal, Paraná, Province d'Entre Ríos, Argentine",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : -31.75304650,
                  "lng" : -60.52145770
               },
               "southwest" : {
                  "lat" : -31.7540150,
                  "lng" : -60.52231020
               }
            },
            "location" : {
               "lat" : -31.75356490,
               "lng" : -60.52185380
            },
            "location_type" : "GEOMETRIC_CENTER",
            "viewport" : {
               "northeast" : {
                  "lat" : -31.75218176970850,
                  "lng" : -60.52053496970849
               },
               "southwest" : {
                  "lat" : -31.75487973029150,
                  "lng" : -60.52323293029150
               }
            }
         },
         "types" : [ "route" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "Maréchal",
               "short_name" : "Maréchal",
               "types" : [ "route" ]
            },
            {
               "long_name" : "Roche-en-Régnier",
               "short_name" : "Roche-en-Régnier",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Haute-Loire",
               "short_name" : "43",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "Auvergne",
               "short_name" : "Auvergne",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "France",
               "short_name" : "FR",
               "types" : [ "country", "political" ]
            },
            {
               "long_name" : "43810",
               "short_name" : "43810",
               "types" : [ "postal_code" ]
            }
         ],
         "formatted_address" : "Maréchal, 43810 Roche-en-Régnier, France",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : 45.22045390,
                  "lng" : 3.9481150
               },
               "southwest" : {
                  "lat" : 45.2184130,
                  "lng" : 3.9470290
               }
            },
            "location" : {
               "lat" : 45.2194410,
               "lng" : 3.9475310
            },
            "location_type" : "GEOMETRIC_CENTER",
            "viewport" : {
               "northeast" : {
                  "lat" : 45.22078243029150,
                  "lng" : 3.948920980291502
               },
               "southwest" : {
                  "lat" : 45.21808446970850,
                  "lng" : 3.946223019708498
               }
            }
         },
         "types" : [ "route" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "Maréchal",
               "short_name" : "Maréchal",
               "types" : [ "route" ]
            },
            {
               "long_name" : "Saint-Vincent-Bragny",
               "short_name" : "Saint-Vincent-Bragny",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Saône-et-Loire",
               "short_name" : "71",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "Bourgogne",
               "short_name" : "Bourgogne",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "France",
               "short_name" : "FR",
               "types" : [ "country", "political" ]
            },
            {
               "long_name" : "71430",
               "short_name" : "71430",
               "types" : [ "postal_code" ]
            }
         ],
         "formatted_address" : "Maréchal, 71430 Saint-Vincent-Bragny, France",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : 46.5020910,
                  "lng" : 4.139616999999999
               },
               "southwest" : {
                  "lat" : 46.501420,
                  "lng" : 4.1377090
               }
            },
            "location" : {
               "lat" : 46.50166030,
               "lng" : 4.13874640
            },
            "location_type" : "GEOMETRIC_CENTER",
            "viewport" : {
               "northeast" : {
                  "lat" : 46.50310448029150,
                  "lng" : 4.140011980291502
               },
               "southwest" : {
                  "lat" : 46.50040651970851,
                  "lng" : 4.137314019708498
               }
            }
         },
         "types" : [ "route" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "Maréchal",
               "short_name" : "Maréchal",
               "types" : [ "natural_feature" ]
            },
            {
               "long_name" : "France",
               "short_name" : "FR",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "Maréchal, France",
         "geometry" : {
            "location" : {
               "lat" : 49.0226380,
               "lng" : -1.6271590
            },
            "location_type" : "APPROXIMATE",
            "viewport" : {
               "northeast" : {
                  "lat" : 49.02398698029150,
                  "lng" : -1.625810019708498
               },
               "southwest" : {
                  "lat" : 49.02128901970850,
                  "lng" : -1.628507980291502
               }
            }
         },
         "types" : [ "natural_feature" ]
      }
   ],
   "status" : "OK"
}

Soit toutes les adresses contenant le mot "maréchal".

Mon problème est que lorsque je veux récupérer la clé formatted_address et que celle ci contient des accès, des caractères spéciaux remplace les accents! Par exemple pour le mot "maréchal", j'obtient "Mar√©chal"

Le code pour récupérer:

Code:

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[result valueForKey:@"formatted_address"]

Le Json contient bien les accents, c'est seulement à partir de l'instruction precedente que l'erreur apparait!

Comment faire pour garder mes accents?

Merci d'avance :)