如何将JSON响应保存到可从UIWebWiew中加载的本地HTML文件中访问的文件 [英] How can I save a JSON response to a file that would be accessible from within a local HTML file loaded inside UIWebWiew

问题描述

我收到了JSON响应，并且当前能够使用我的应用程序中的数据。

I am receiving a JSON response and am currenlty able to make use of the data within my app.

我想将此响应保存到文件中，以便我可以在项目中的JS文件中引用。我已经在应用程序启动时请求了一次这样的数据，所以为什么不将它保存到文件中并引用它，因此只需要一次调用数据。

I would like to save this response to a file so I could reference within an JS file located inside my project. I have already requested this data once when the application is launched so why not save it to a file and reference that throughout so only one call is needed for the data.

我的UIWebView的HTML文件使用创建文件夹参考选项导入到我的Xcode项目中，我的JS文件的路径是 html-> js-> app.js

The HTML files for my UIWebView are imported into my Xcode project using the "create folder reference" option and the path to my JS file is html->js->app.js

我想在设备的某个地方将响应保存为 data.json 然后在我的js文件中引用像这样 request.open（'GET'，'file-path-to-saved-json.data-file'，false）;

I want to save the response as data.json somewhere on the device and then reference inside my js file like this request.open('GET', 'file-path-to-saved-json.data-file', false);

我怎样才能实现这个目标？

How can I achieve this?

推荐答案

在完成这个想法之后，我来了更多使用。

After working with the idea some more here is what I came up with.

安装应用程序时，程序包中有一个默认数据文件，我将其复制到Documents文件夹。当应用程序 didFinishLaunchingWithOptions 运行时，我调用以下方法：

When the application is installed there is a default data file in the package that I copy to the Documents folder. When the application didFinishLaunchingWithOptions runs I call the following method:

- (void)writeJsonToFile
{   
//applications Documents dirctory path
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

//live json data url
NSString *stringURL = @"http://path-to-live-file.json";
NSURL *url = [NSURL URLWithString:stringURL];
NSData *urlData = [NSData dataWithContentsOfURL:url];

    //attempt to download live data
    if (urlData)
    {   
        NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"data.json"];
        [urlData writeToFile:filePath atomically:YES];
    }
    //copy data from initial package into the applications Documents folder
    else
    {
        //file to write to
        NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"data.json"];

        //file to copy from
        NSString *json = [ [NSBundle mainBundle] pathForResource:@"data" ofType:@"json" inDirectory:@"html/data" ];
        NSData *jsonData = [NSData dataWithContentsOfFile:json options:kNilOptions error:nil];

        //write file to device
        [jsonData writeToFile:filePath atomically:YES];
    }
}

然后在整个应用程序中我需要引用数据，我使用保存的文件。

Then throughout the application when I need to reference the data, I use the saved file.

//application Documents dirctory path
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

NSError *jsonError = nil;

NSString *jsonFilePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"data.json"];
NSData *jsonData = [NSData dataWithContentsOfFile:jsonFilePath options:kNilOptions error:&jsonError ];

为了在我的JS代码中引用json文件，我为src添加了一个URL参数并通过了应用程序文档文件夹的文件路径。

To reference the json file in my JS code, I added a URL parameter for "src" and passed the file path to the Applications Documents folder.

 request.open('GET', src, false);

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