How to call JSON asynchronous in xcode/ iphone develope
- by Frames84
I'm using the JSON framework hosting on Google. What and it's a news app that loads JSON feeds, when app goes off to load the feed I want to display the UIActivityIndicatorView but I've found my JSON Access code is not being called asynchronous which is locking the user interface. I have highlighted the function in the code and can't figuree out without breaking how to change the code.
#import "JSON DataAccess Wrapper.h"
#import "JSON.h"
@implementation JSON_DataAccess_Wrapper
@synthesize dataItemList;
//////////////////////////////////////////////
/* START FEED CONNECTION/ HANDLE METHODS */
//////////////////////////////////////////////
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[responseData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
//label.text = [NSString stringWithFormat:@"Connection failed: %@", [error description]];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[connection release];
}
- (NSString *)stringWithUrl:(NSURL *)url
{
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url
cachePolicy:NSURLRequestReturnCacheDataElseLoad
timeoutInterval:30];
NSData *urlData;
NSURLResponse *response = nil;
NSError *error = nil;
/*
HOW TO MAKE THE CALL BELOW ASYNCHRONOUS
*/
urlData = [NSURLConnection sendSynchronousRequest:urlRequest
returningResponse:&response
error:&error];
return [[NSString alloc] initWithData:urlData encoding:NSUTF8StringEncoding];
}
-(id) objectWithUrl:(NSURL *)url
{
SBJSON *jsonParser = [SBJSON new];
NSString *jsonString = [self stringWithUrl:url];
return [jsonParser objectWithString:jsonString error:NULL];
}
- (NSMutableArray *) downloadJSONFeed
{
id response = [self objectWithUrl:[NSURL URLWithString:@"http://www.mysite.co.uk/index2.php?option=JSON"]];
NSMutableArray *feed = (NSMutableArray *) response;
return feed;
}
