Ios 从本地JSON文件加载数据

使用断点，我发现每个对象都在初始化，但字典值是

nil

。语法有什么问题吗

NSString *fileResource = @"albums";
NSString *filePath = [[NSBundle mainBundle]pathForResource:fileResource ofType:@"rtf"];
NSLog(@"%@",filePath);
NSURL *localFileURL = [NSURL fileURLWithPath:filePath];
NSData *contentOfLocalFile = [NSData dataWithContentsOfURL:localFileURL];
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:contentOfLocalFile options:0 error:nil];

JSON文件如下所示

{
    "Albums": [{
        "Title": "Album 1",
        "Desc": "Description",
        "images": ["http://img0.etsystatic.com/000/0/6391580/il_fullxfull.340668108.jpg", "https://img1.etsystatic.com/000/0/6515756/il_fullxfull.330077675.jpg", "http://www.betterphoto.com/uploads/processed/0724/0706140402101moore_5-2.jpg"]
    }, {
        "Title": "Album 2",
        "Desc": "Description",
        "images": ["http://www.betterphoto.com/uploads/processed/0724/0706140402101moore_5-2.jpg", "http://www.artinnaturephotography.com/images/large/06012008_001.jpg",
            "http://img0.etsystatic.com/000/0/6391580/il_fullxfull.340668108.jpg", "https://img1.etsystatic.com/000/0/6515756/il_fullxfull.330077675.jpg", "http://www.betterphoto.com/uploads/processed/0724/0706140402101moore_5-2.jpg"
        ]
    }]
}

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"fileName" ofType:@"json"];

NSString *myJSON = [[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:NULL];

NSError *error =  nil;

//// if it is array
NSArray *jsonDataArray = [NSJSONSerialization JSONObjectWithData:[myJSON dataUsingEncoding:NSUTF8StringEncoding] options:kNilOptions error:&error];

---

试试这个，我应该知道你使用的是rtf而不是json

 NSString *filePath = [[NSBundle mainBundle] pathForResource:@"albums" ofType:@"json"];
    NSData *JSONData = [NSData dataWithContentsOfFile:filePath options:NSDataReadingMappedIfSafe error:nil];

    NSError *readerror;

    id jsonObject = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableContainers error:&readerror];

---

要将本地JSON文件加载到项目中，请使用默认的GeoJson文件，而不是使用rtf文件

您可以像这样检索数据

{
    "Albums": [{
        "Title": "Album 1",
        "Desc": "Description",
        "images": ["http://img0.etsystatic.com/000/0/6391580/il_fullxfull.340668108.jpg", "https://img1.etsystatic.com/000/0/6515756/il_fullxfull.330077675.jpg", "http://www.betterphoto.com/uploads/processed/0724/0706140402101moore_5-2.jpg"]
    }, {
        "Title": "Album 2",
        "Desc": "Description",
        "images": ["http://www.betterphoto.com/uploads/processed/0724/0706140402101moore_5-2.jpg", "http://www.artinnaturephotography.com/images/large/06012008_001.jpg",
            "http://img0.etsystatic.com/000/0/6391580/il_fullxfull.340668108.jpg", "https://img1.etsystatic.com/000/0/6515756/il_fullxfull.330077675.jpg", "http://www.betterphoto.com/uploads/processed/0724/0706140402101moore_5-2.jpg"
        ]
    }]
}

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"fileName" ofType:@"json"];

NSString *myJSON = [[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:NULL];

NSError *error =  nil;

//// if it is array
NSArray *jsonDataArray = [NSJSONSerialization JSONObjectWithData:[myJSON dataUsingEncoding:NSUTF8StringEncoding] options:kNilOptions error:&error];

---

使用

JSONObjectWithData:options:error:

方法中的

error

属性，查看错误是什么。添加NSError*error；[NSJSONSerialization JSONObjectWithData:ContentOfCalFile选项：0错误：错误]；它将显示错误内容。@rmaddy它显示数据无法读取，因为它的格式不正确。然后修复JSON文件，使其成为有效的JSON。顺便说一句，为什么要将RTF文件视为JSON文件？它们是两种完全不同的文件。@rmaddy你能告诉我怎么做吗。我应该把扩展名重命名为.json吗？