How to download xml file and save in local iphone application - iphone

Question

I have a magazine application i want that it load file from server and store it in application when application starts first time only and then use that locally file to save time i am getting data which is located on server it takes alot time
NSURL*myurl=url;
myurl = [myurl stringByReplacingOccurrencesOfString:#"\n" withString:#""];
myurl = [myurl stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSURL*urlloaded= [[NSURL alloc]initWithString:myurl];
//NSURL*url= [[NSURL alloc]initWithString:#"http://localhost:8888/RowOne.xml"];
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:urlloaded];
//Initialize the delegate.
RowTwoParser *parser = [[RowTwoParser alloc] initXMLParser];
//Set delegate
[xmlParser setDelegate:parser];
BOOL success = [xmlParser parse];
if(success)
NSLog(#"No Errors");
else
NSLog(#"Error Error Error!!!");

Answer 1

What you can do is:-
Suppose you have parsed your xml and stored data in array say 'dataArray'
Now you have to save your dataArray in NSUserDefaults
NSUserDefaults *pref1=[NSUserDefaults standardUserDefaults];
[pref1 setObject:dataArray forKey:#"parseData"];
[pref1 synchronize];
Whenever you have to use this data you can extract it like:-
NSUserDefaults *pref1=[NSUserDefaults standardUserDefaults];
NSArray *dataArray=[pref1 objectForKey:#"parseData"];

Answer 2

You can download the initial data i.e the XML file by using something like this
- (void)downloadInitialData {
NSUserDefaults* userDefaults = [NSUserDefaults standardUserDefaults];
if ([userDefaults boolForKey:#"DATA_DOWNLOAD_KEY"] == NO) {
[self showWaitViewWithText:#"Downloading Data..."];
[self fetchDataFromServer];
}
}
- (void)fetchDataFromServer {
//Call to server to downlaod data
//When Data is successfully downloaded
//Stop loading when data save completes
[self stopLoading];
//Update USerDefaults
NSUserDefaults* userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setBool:YES forKey:#"DATA_DOWNLOAD_KEY"];
[userDefaults synchronize];
}
You can make call to [self downloadInitialData]; which will ensure that Data is downloaded only once when the application starts . You will have to fix it according to your requirements to download data by resetting the #"DATA_DOWNLOAD_KEY" key.

Answer 3

Check out Apples own SeismicXML example - source code available.