CODEWITHSUNDEEP
iosobjective-cjson
janatan
janatan

Reputation: 415

how to store json data from url in ios device and to use local it

I want to use json in my application. I can parse json from url with this code :

#import "ViewController.h"
@implementation ViewController
{
    NSDictionary *titles;
    NSMutableData *Data;
    NSArray *fileContent;
    NSArray *folderContent;
    NSMutableArray *all;
}
@synthesize Table;
- (void)viewDidLoad
{
    [super viewDidLoad];  
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    NSURL *url =[NSURL URLWithString:@"http://192.168.1.100/veis/root/developers/api/filemanager.php?key=5147379269&getlist=root"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [[NSURLConnection alloc]initWithRequest:request delegate:self];

}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    Data = [[NSMutableData alloc]init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData
{
    [Data appendData:theData];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

    titles = [NSJSONSerialization JSONObjectWithData:Data options:kNilOptions error:nil];
    fileContent = [titles objectForKey:@"fileContent"];
    folderContent = [titles objectForKey:@"folderContent"];
    all = [[NSMutableArray alloc]init];
    [all addObjectsFromArray:folderContent];
    [all addObjectsFromArray:fileContent];
    [Table reloadData];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    UIAlertView *errorView = [[UIAlertView alloc]initWithTitle:@"Error" message:@"The Connection has been LOST" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
    [errorView show];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

but I want when I dont have internet I can to use of json. I dont know how to use of json in way offline (or local in my device)

can you guide me in this issue that how to use json in way offline

Upvotes: 1

Views: 8124

Answers (1)

iphonic
iphonic

Reputation: 12717

The way parsing should be same for Online and Offline json data, both are same, just you need to write a file using Unparsed data say data.json in Documents Directory, if you want to use the same process to use json, but if you want to use parsed json, then write it as plist..

You can try to use the following methods

-(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]
}

Then call the function as

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

    [self saveJsonWithData:data];
}

Upvotes: 6

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