ios - JSON data to UITableView using Objective-C -

-- updated question main json file --

i'm trying add names table view. table empty. (xcode 7.1b1, ios 9.1b2) sample .json file i'm testing code with. main json file has lot more data.

i successful in adding data sample json file. after using main json file, table empty again.

.json file

[   {     "150978": {       "jobs": {         "d0-c14008-cw": {           "05-9032": {             "g-05": {               "hours_rwk": "false",               "hours_st": "4l",               "hours_ewo_id": "d0-c14008-cwddda",               "hours_ewo": "true",               "hours_dt": "0l",               "hours_ot": "0l",               "comments": ""             }           },           "05-9031": {             "b-02": {               "hours_rwk": "false",               "hours_st": "4l",               "hours_ewo_id": "",               "hours_ewo": "false",               "hours_dt": "0l",               "hours_ot": "0l",               "comments": ""             }           }         }       },       "name": "cirillobetancourt",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "",       "signed_in": "true",       "time_in": "08: 30",       "time_out": "16: 30",       "signed_out": "true"     },     "151243": {       "jobs": {},       "name": "jasondiaz",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "151248": {       "jobs": {},       "name": "angeltorresmadrigal",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "151336": {       "jobs": {},       "name": "danielfrey",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "151419": {       "jobs": {         "d0-c14009-cw1": {           "05-9033": {             "g-07": {               "hours_rwk": "false",               "hours_st": "8l",               "hours_ewo_id": "0",               "hours_ewo": "false",               "hours_dt": "0l",               "hours_ot": "0l",               "comments": ""             }           }         },         "d0-c14008-cw": {           "05-9031": {             "b-02": {               "hours_rwk": "false",               "hours_st": "0l",               "hours_ewo_id": "0",               "hours_ewo": "true",               "hours_dt": "0l",               "hours_ot": "2l",               "comments": ""             }           }         }       },       "name": "mikegullan",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9990666": {       "jobs": {},       "name": "mattstaricha",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9992610": {       "jobs": {},       "name": "matthewbigelow",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9992778": {       "jobs": {},       "name": "zhoutan",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9993273": {       "jobs": {},       "name": "randyfarinelli",       "site_id": "d0-c14008-cw",       "trade": "carpenter",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9996467": {       "jobs": {},       "name": "alvarosandoval(guardado)",       "site_id": "d0-c14008-cw",       "trade": "mason",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9996763": {       "jobs": {},       "name": "jesuszarate",       "site_id": "d0-c14008-cw",       "trade": "mason",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9996767": {       "jobs": {},       "name": "jorgeromero",       "site_id": "d0-c14008-cw",       "trade": "mason",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9996768": {       "jobs": {         "d0-c14008-cw": {           "05-9032": {             "g-05": {               "hours_rwk": "false",               "hours_st": "3l",               "hours_ewo_id": "0",               "hours_ewo": "false",               "hours_dt": "0l",               "hours_ot": "0l",               "comments": ""             }           },           "05-9031": {             "b-02": {               "hours_rwk": "false",               "hours_st": "5l",               "hours_ewo_id": "0",               "hours_ewo": "false",               "hours_dt": "0l",               "hours_ot": "0l",               "comments": ""             }           }         }       },       "name": "victorruiz",       "site_id": "d0-c14008-cw",       "trade": "mason",       "note": "",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9996771": {       "jobs": {},       "name": "gabinomata-neri",       "site_id": "d0-c14008-cw",       "trade": "mason",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9999247": {       "jobs": {         "d0-c14008-cw": {           "05-9032": {             "g-05": {               "hours_rwk": "false",               "hours_st": "8l",               "hours_ewo_id": "0",               "hours_ewo": "false",               "hours_dt": "0l",               "hours_ot": "0l",               "comments": ""             }           },           "05-9031": {             "b-02": {               "hours_rwk": "true",               "hours_st": "0l",               "hours_ewo_id": "0",               "hours_ewo": "false",               "hours_dt": "0l",               "hours_ot": "1l",               "comments": ""             }           }         }       },       "name": "franciscomontez",       "site_id": "d0-c14008-cw",       "trade": "mason",       "note": "",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     },     "9999314": {       "jobs": {},       "name": "romanhernandez",       "site_id": "d0-c14008-cw",       "trade": "mason",       "note": "nowork",       "signed_in": "false",       "time_in": "06: 00",       "time_out": "06: 00",       "signed_out": "false"     }   } ] 

.h file

#import <uikit/uikit.h>  @interface tableviewcontroller : uitableviewcontroller  @property (nonatomic, strong) nsarray *namearray; @property (nonatomic, strong) nsarray *dict; @property (nonatomic, strong) nsdata *data; @property (nonatomic, strong) nsstring *filepath;  @end 

.m file

#import "tableviewcontroller.h" #import "tableviewcell.h"  @interface tableviewcontroller ()  @end  @implementation tableviewcontroller  - (void)viewdidload {     [super viewdidload];      // uncomment following line preserve selection between presentations.     // self.clearsselectiononviewwillappear = no;      // uncomment following line display edit button in navigation bar view controller.     // self.navigationitem.rightbarbuttonitem = self.editbuttonitem;      nserror *error = nil;      _filepath = [[nsbundle mainbundle] pathforresource:@"data" oftype:@"json"];     _data = [nsdata datawithcontentsoffile:_filepath];     _dict = [nsjsonserialization jsonobjectwithdata:_data options:0 error:&error];  }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  #pragma mark - table view data source  - (nsinteger)numberofsectionsintableview:(uitableview *)tableview { //#warning incomplete implementation, return number of sections     return 1; }  - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section { //#warning incomplete implementation, return number of rows     return _dict.count; }  - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     tableviewcell *cell = [tableview dequeuereusablecellwithidentifier:@"tablecell" forindexpath:indexpath];      // configure cell...     nsdictionary *dict = _dict[indexpath.row]; nsstring *name = dict[@"name"]; cell.titlelabel.text = name;      return cell; } 

your json misformatted. should be:

[     {         "name": "xyz",         "details": "xyz"     },     {         "name": "xyz",         "details": "xyz"     } ] 

when executing _dict = [nsjsonserialization jsonobjectwithdata:_data options:0 error:&error]; array of dictionaries , not single dictionary. calling _namearray = [_dict objectforkey:@"name"]; should return nil or crash.

here's implementation should like:

#import "tableviewcontroller.h" #import "tableviewcell.h"  @interface tableviewcontroller ()  @end  @implementation tableviewcontroller  - (void)viewdidload {     [super viewdidload];     nserror *error = nil;     _filepath = [[nsbundle mainbundle] pathforresource:@"data" oftype:@"json"];     _data = [nsdata datawithcontentsoffile:_filepath];     // remember here, __dict array, kept same name code not dictionary.     _dict = [nsjsonserialization jsonobjectwithdata:_data options:0 error:&error];     _namearray = [_dict objectforkey:@"name"]; }  #pragma mark - table view data source  - (nsinteger)numberofsectionsintableview:(uitableview *)tableview {     return 1; }  - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {     return _dict.count; }  - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     tableviewcell *cell = [tableview dequeuereusablecellwithidentifier:@"tablecell" forindexpath:indexpath];     // remember here, __dict array, kept same name code not dictionary.     nsdictionary *dict = _dict[indexpath.row];     nsstring *name = dict[@"name"];     cell.titlelabel.text = name;     return cell; }