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ios - 使用 Objective-C 到 UITableView 的 JSON 数据

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菜鸟教程小白 发表于 2022-12-12 09:01:20 | 显示全部楼层 |阅读模式 打印 上一主题 下一主题
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-- 主 JSON 文件的更新问题 --

我正在尝试将名称添加到表格 View 中。但 table 总是空的。 (Xcode 7.1b1，iOS 9.1b2) 这只是我正在测试我的代码的示例 .json 文件。主 json 文件有更多的数据。

我成功地添加了示例 json 文件中的数据。但是现在使用主json文件后，表又是空的了。

.json 文件

[
  {
    "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 文件

#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 文件

#import "TableViewController.h"
#import "TableViewCell.h"

@interface TableViewController ()

@end

@implementation TableViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this 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 any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableViewUITableView *)tableView {
//#warning Incomplete implementation, return the number of sections
    return 1;
}

- (NSInteger)tableViewUITableView *)tableView numberOfRowsInSectionNSInteger)section {
//#warning Incomplete implementation, return the number of rows
    return _dict.count;
}

- (UITableViewCell *)tableViewUITableView *)tableView cellForRowAtIndexPathNSIndexPath *)indexPath {
    TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier"TableCell" forIndexPath:indexPath];

    // Configure the cell...
    NSDictionary *dict = _dict[indexPath.row];
NSString *name = dict[@"name"];
cell.titleLabel.text = name;

    return cell;
}


Best Answer-推荐答案


您的 JSON 实际上格式错误。应该是:

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

当您执行 _dict = [NSJSONSerialization JSONObjectWithData:_data options:0 error:&error]; 时，您实际得到的是字典数组，不是单个字典。所以调用 _nameArray = [_dict objectForKey"name"]; 实际上应该返回 nil 或崩溃。

你的实现应该是这样的:

#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 is an array, I kept the same name as your code but it is NOT a dictionary.
    _dict = [NSJSONSerialization JSONObjectWithData:_data options:0 error:&error];
    _nameArray = [_dict objectForKey"name"];
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableViewUITableView *)tableView {
    return 1;
}

- (NSInteger)tableViewUITableView *)tableView numberOfRowsInSectionNSInteger)section {
    return _dict.count;
}

- (UITableViewCell *)tableViewUITableView *)tableView cellForRowAtIndexPathNSIndexPath *)indexPath {
    TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier"TableCell" forIndexPath:indexPath];
    // Remember here, __dict is an array, I kept the same name as your code but it is NOT a dictionary.
    NSDictionary *dict = _dict[indexPath.row];
    NSString *name = dict[@"name"];
    cell.titleLabel.text = name;
    return cell;
}

关于ios - 使用 Objective-C 到 UITableView 的 JSON 数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32693193/

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