Parsing a JSON string into three arrays Objective C - ios

Question

I am trying to use the data which I read from a text file in objective c. The data I read from the text file is:
{"aps":{"alert":"Test 1!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}|{"aps":{"alert":"Test 2!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}|{"aps":{"alert":"Test 3!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}|{"aps":{"alert":"Test 4!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}|{"aps":{"alert":"Test 5!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}
Once read, I split the file into an array with a delimiter of "|". I then want to further separate it into 3 different arrays: banking, fraud and investment based on the key "Type". However I cannot seem to reach parse the JSON string once I split it into the array. My view did load method is below:
- (void)viewDidLoad {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fileName = [NSString stringWithFormat:#"%#/AccountNotifications.txt", documentsDirectory];
NSString *fileContents = [[NSString alloc] initWithContentsOfFile:fileName usedEncoding:nil error:nil];
NSArray *fileData = [fileContents componentsSeparatedByString:#"|"];
if (fileContents != NULL)
{
bankingNotifications = [[NSMutableArray alloc] init];
fraudNotifications = [[NSMutableArray alloc] init];
investmentNotifications = [[NSMutableArray alloc] init];
for (i = 0; i < [fileData count]; i++)
{
NSString *notification = fileData[i];
NSDictionary *json = [notification JSONValue];
NSArray *items = [json valueForKeyPath:#"aps"];
if ([[[items objectAtIndex:i] objectForKey:#"Type"] isEqual: #"Banking"])
{
[bankingNotifications addObject:fileData[i]];
NSLog(#"Added object to banking array");
}
if ([[[items objectAtIndex:i] objectForKey:#"Type"] isEqual: #"Fraud"])
{
[fraudNotifications addObject:fileData[i]];
NSLog(#"Added object to fraud array");
}
if ([[[items objectAtIndex:i] objectForKey:#"Type"] isEqual: #"Investment"])
{
[investmentNotifications addObject:fileData[i]];
NSLog(#"Added object to investment array");
}
} }
There is an error with these three lines:
NSString *notification = fileData[i];
NSDictionary *json = [notification JSONValue];
NSArray *items = [json valueForKeyPath:#"aps"];
Could you please help me parse the JSON strings into the three mutable arrays? The error I am getting is:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryM objectAtIndex:]: unrecognized selector sent to instance 0x1d59db30'

Answer 1

If you create the text file yourself I would suggest you create a valid json object (as your data looks like it is supposed to be json) to keep your data nice and clean. similar to this:
{"aps":[{"type":"Banking","badge":5},{"Type":"Fraud","badge":12}]}
Then you can do following (this code is not tested, it can be that you have to amend it a bit) but i hope you'll get an idea :)
NSError* error = nil;
NSDictionary* dict = nil;
//serialising the jsonobject to a dictionary
dict = [NSJSONSerialization JSONObjectWithData:fileContents
options:kNilOptions
error:&error];
bankingNotifications = [[NSMutableArray alloc] init];
fraudNotifications = [[NSMutableArray alloc] init];
investmentNotifications = [[NSMutableArray alloc] init];
if (dict) {
NSArray *dataArray = [dict objectForKey:#"aps"];
NSDictionary* siteData = nil;
NSEnumerator* resultsEnum = [dataArray objectEnumerator];
while (siteData = [resultsEnum nextObject])
{
//
if( [[siteData objectForKey:#"Type"] isEqualToString: #"Banking"]) {
[bankingNotifications addObject:notification];
NSLog(#"Added object to banking array");
} else if ([[siteData objectForKey:#"Type"] isEqualToString: #"Fraud"])
{
[fraudNotifications addObject:notification];
NSLog(#"Added object to fraud array");
}
else if ([[siteData objectForKey:#"Type"] isEqualToString: #"Investment"])
{
[investmentNotifications addObject:notification];
NSLog(#"Added object to investment array");
}
}
}

Answer 2

The value for Key "aps" is a dictionary.
NSDictionary *item = [json valueForKeyPath:#"aps"];
if ([[item objectForKey:#"Type"] isEqualToString: #"Banking"])
{
[bankingNotifications addObject:notification];
NSLog(#"Added object to banking array");
}
else if ([[item objectForKey:#"Type"] isEqualToString: #"Fraud"])
{
[fraudNotifications addObject:notification];
NSLog(#"Added object to fraud array");
}
else if ([[item objectForKey:#"Type"] isEqualToString: #"Investment"])
{
[investmentNotifications addObject:notification];
NSLog(#"Added object to investment array");
}