如何将JSON文件从Web服务保存到本地JSON文件? [英] How would I go about saving a JSON file from a webservice to a local JSON file?

问题描述

我目前正在使用来自远程Web服务的JSON数据(NSArray格式)填充UITableView.我想通过调用Web服务并将JSON数据存储到本地文件来加速应用程序.

I'm currently populating a UITableView with JSON data (NSArray format) from a remote webservice. I would like to speed up the application by making a call to the webservice and storing the JSON data to a local file.

还有，这是一个好方法吗，这样用户不必一直保持下载数据的状态?

also, is this a good way to do this so the user doesn't have to keep downloading data all the time?

我遇到的问题是如何将远程JSON文件保存到本地文件.在我的-(void)saveJsonWithData:(NSData *)data 方法中，如何保存远程数据.

What I'm stuck on is how to save the remote JSON file to a local file. In my -(void)saveJsonWithData:(NSData *)data method how do I save the remote data.

这是到目前为止我正在使用的代码(来自某些Stackoverflow搜索)

Here's the code I'm using so far (from some Stackoverflow searching)

-(void)saveJsonWithData:(NSData *)data{

 NSString *jsonPath=[[NSSearchPathForDirectoriesInDomains(NSUserDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingFormat:@"/data.json"];

 [data writeToFile:jsonPath atomically:YES];

}

-(NSData *)getSavedJsonData{
    NSString *jsonPath=[[NSSearchPathForDirectoriesInDomains(NSUserDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingFormat:@"/data.json"];

    return [NSData dataWithContentsOfFile:jsonPath]
}

然后将函数调用为

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{

    [self saveJsonWithData:data];
}

感谢帮助

推荐答案

在iOS上，您应该使用 NSSearchPathForDirectoriesInDomains(NSDocumentDirectory，NSUserDomainMask，YES)来获取文档目录.没有用户目录.

On iOS you should be using NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) to get the document directory. There is no user directory.

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