ios - 使用 Objective-C 到 UITableView 的 JSON 数据
<p><p><strong>-- 主 JSON 文件的更新问题 --</strong></p>
<p>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。 </p>
<p>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。</p>
<p><strong>.json 文件</strong></p>
<pre><code>[
{
"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"
}
}
]
</code></pre>
<p><strong>.h 文件</strong></p>
<pre><code>#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
</code></pre>
<p><strong>.m 文件</strong></p>
<pre><code>#import "TableViewController.h"
#import "TableViewCell.h"
@interface TableViewController ()
@end
@implementation TableViewController
- (void)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 = [ pathForResource:@"data" ofType:@"json"];
_data = ;
_dict = ;
}
- (void)didReceiveMemoryWarning {
;
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
//#warning Incomplete implementation, return the number of sections
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
//#warning Incomplete implementation, return the number of rows
return _dict.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
TableViewCell *cell = ;
// Configure the cell...
NSDictionary *dict = _dict;
NSString *name = dict[@"name"];
cell.titleLabel.text = name;
return cell;
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您的 JSON 实际上格式错误。应该是:</p>
<pre><code>[
{
"name": "XYZ",
"details": "XYZ"
},
{
"name": "XYZ",
"details": "XYZ"
}
]
</code></pre>
<p>当您执行 <code>_dict = ;</code> 时，您实际得到的是字典数组，<em>不是</em>单个字典。所以调用 <code>_nameArray = ;</code> 实际上应该返回 <code>nil</code> 或崩溃。</p>
<p>你的实现应该是这样的:</p>
<pre><code>#import "TableViewController.h"
#import "TableViewCell.h"
@interface TableViewController ()
@end
@implementation TableViewController
- (void)viewDidLoad {
;
NSError *error = nil;
_filePath = [ pathForResource:@"data" ofType:@"json"];
_data = ;
// Remember here, __dict is an array, I kept the same name as your code but it is NOT a dictionary.
_dict = ;
_nameArray = ;
}
#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 = ;
// Remember here, __dict is an array, I kept the same name as your code but it is NOT a dictionary.
NSDictionary *dict = _dict;
NSString *name = dict[@"name"];
cell.titleLabel.text = name;
return cell;
}
</code></pre></p>
<p style="font-size: 20px;">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：
<a href="https://stackoverflow.com/questions/32693193/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/32693193/
</a>
</p>
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