我正在使用SwiftyJSON。
我有一个像这样的json字符串：
{
"geocoded_waypoints" : [
{
"geocoder_status" : "OK",
"place_id" : "ChIJkcemZ9r9jT8RCoy7cipVk3Q",
"types" : [ "route" ]
},
{
"geocoder_status" : "OK",
"place_id" : "ChIJzYyVGtcFjj8RMoV0IaoNhzA",
"types" : [ "route" ]
}
],
"routes" : [
{
"bounds" : {
"northeast" : {
"lat" : 35.7884236,
"lng" : 51.43490389999999
},
"southwest" : {
"lat" : 35.7056256,
"lng" : 51.3073962
}
},
"copyrights" : "Map data ©2017 Google",
"legs" : [
{
"distance" : {
"text" : "20.9 km",
"value" : 20893
},
"duration" : {
"text" : "32 mins",
"value" : 1936
},
"end_address" : "Tehran Province, Tehran, Hossein, Iran",
"end_location" : {
"lat" : 35.7883586,
"lng" : 51.43490389999999
},
"start_address" : "Tehran Province, Tehran, Kooy-e-Bimeh, Rostam, Iran",
"start_location" : {
"lat" : 35.7056307,
"lng" : 51.3167437
},
"steps" : [
{
"distance" : {
"text" : "59 m",
"value" : 59
},
"duration" : {
"text" : "1 min",
"value" : 21
},
"end_location" : {
"lat" : 35.70562779999999,
"lng" : 51.31739839999999
},
"html_instructions" : "Head \u003cb\u003eeast\u003c/b\u003e on \u003cb\u003eRostam\u003c/b\u003e toward \u003cb\u003e4th Bimeh St\u003c/b\u003e\u003cdiv style=\"font-size:0.9em\"\u003ePass by Burgerich (on the right)\u003c/div\u003e",
"polyline" : {
"points" : "ew|xEsxexH?W?w@?s@"
},
"start_location" : {
"lat" : 35.7056307,
"lng" : 51.3167437
},
"travel_mode" : "DRIVING"
},
{
"distance" : {
"text" : "0.1 km",
"value" : 135
},
"duration" : {
"text" : "1 min",
"value" : 30
},
"end_location" : {
"lat" : 35.7868183,
"lng" : 51.4303372
},
"html_instructions" : "Continue onto \u003cb\u003eSharifi Manesh St\u003c/b\u003e\u003cdiv style=\"font-size:0.9em\"\u003ePass by Embassy of Switzerland In Tehran (on the left)\u003c/div\u003e",
"polyline" : {
"points" : "cllyEyy{xHSIQSIIYWk@[_Ak@YQ"
},
"start_location" : {
"lat" : 35.7857769,
"lng" : 51.4295729
},
"travel_mode" : "DRIVING"
},
{
"distance" : {
"text" : "0.3 km",
"value" : 304
},
"duration" : {
"text" : "1 min",
"value" : 51
},
"end_location" : {
"lat" : 35.7852475,
"lng" : 51.4330904
},
"html_instructions" : "\u003cb\u003eSharifi Manesh St\u003c/b\u003e turns \u003cb\u003eright\u003c/b\u003e and becomes \u003cb\u003eElahiyeh St\u003c/b\u003e\u003cdiv style=\"font-size:0.9em\"\u003ePass by باشگاه الهیه (on the left)\u003c/div\u003e",
"polyline" : {
"points" : "srlyEs~{xHpBwEdA}BxAqCf@}@"
},
"start_location" : {
"lat" : 35.7868183,
"lng" : 51.4303372
},
"travel_mode" : "DRIVING"
},
{
"distance" : {
"text" : "0.4 km",
"value" : 359
},
"duration" : {
"text" : "1 min",
"value" : 70
},
"end_location" : {
"lat" : 35.7884241,
"lng" : 51.4337388
},
"html_instructions" : "Turn \u003cb\u003eleft\u003c/b\u003e onto \u003cb\u003eKhazar St\u003c/b\u003e\u003cdiv style=\"font-size:0.9em\"\u003ePass by MaryamHair (on the left)\u003c/div\u003e",
"maneuver" : "turn-left",
"polyline" : {
"points" : "yhlyEyo|xHwBYwCg@wA[}AQuAM}AC"
},
"start_location" : {
"lat" : 35.7852475,
"lng" : 51.4330904
},
"travel_mode" : "DRIVING"
},
{
"distance" : {
"text" : "0.1 km",
"value" : 105
},
"duration" : {
"text" : "1 min",
"value" : 39
},
"end_location" : {
"lat" : 35.7883586,
"lng" : 51.43490389999999
},
"html_instructions" : "Turn \u003cb\u003eright\u003c/b\u003e at هنرستان مفتح onto \u003cb\u003eHossein\u003c/b\u003e",
"maneuver" : "turn-right",
"polyline" : {
"points" : "s|lyE{s|xH?AJeF"
},
"start_location" : {
"lat" : 35.7884241,
"lng" : 51.4337388
},
"travel_mode" : "DRIVING"
}
],
"traffic_speed_entry" : [],
"via_waypoint" : []
}
],
"overview_polyline" : {
"points" : "ew|xEsxexH?oA"
},
"summary" : "Hakim Expy",
"warnings" : [],
"waypoint_order" : []
}
],
"status" : "OK"
}
我想得到的是routes->legs->distance->text。
我的代码：
let json = NSString(data: data, encoding: String.Encoding.utf8.rawValue) as! String
if let data = json.data(using: String.Encoding.utf8) {
let json = JSON(data: data)
print("--->\(json["routes"]["legs"]["distance"]["text"].string)")
}
print返回--->nil。
答案 0 :(得分：2)
CML_System_IO_CaptureStdOutput.clw和routes是数组，您必须先获得第一个条目：
legsP.S。如果您不想要数组中的第一个条目，则可能需要进行一些逻辑检查。