NSDictionary is treated as a boolean - can't debug - ios

Question

NSDictionary *tokenData = [[responseDict objectForKey:#"data"] objectForKey:#"multipass"];
dispatch_async(dispatch_get_main_queue(), ^{
NSString *card = [NSString stringWithFormat:#"%#-%#",
[[UserAccount sharedInstance] cardNumber],
[tokenData objectForKey:#"CardPhoneToken"]]; //<-- problem
});
I've been fighting with this line of code since yesterday.I'm geting a JSON feed from the server nad My problem is that one time out of ten tokenData returns with 0 instead of a Dictionary and I can't figure out why. When it returns as 0 it is also treated as a boolean by the compiler (can't figure out why either) and i'm getting the error -[NSCFBoolean objectForKey:]: unrecognized selector sent to instance 0x81aa20
I've tried doing something like this
if(!tokenData)
{
NSLog(#"This is going to crash");
} But when tokenData returns 0 the if isn't getting called.
esponseDict JSON I'm getting :
{ code = 200; data = {
multipass = {
CardPhoneBarcodeToken = 562431;
CardPhoneToken = 23221;
errorMessage = "";
operationResult = 0;
};
};
}
This is how it looks right before it crashes: { code = 200; data = { multipass = 0; }; }
Update: I've managed to take action if tokenData is not NSDictionary now I'm facing another problem with the else section. How can I reload the tokenData if it's not a NSDictionary ? I tried calling *tokenData = [[responseDict objectForKey:#"data"] objectForKey:#"multipass"]; inside the else but I'm keep getting tokenData = 0
Thanks

Answer 1

I would check if tokenData is a NSDictionary before parsing it.
-(void)loadData
{
NSDictionary *tokenData = [[responseDict objectForKey:#"data"] objectForKey:#"multipass"];
dispatch_async(dispatch_get_main_queue(), ^{
NSString *cardPhoneToken = #"";
if( [tokenData isKindOfClass:[NSDictionary class]] ){
retryCount = 0;
cardPhoneToken = [tokenData objectForKey:#"CardPhoneToken"];
} else {
NSLog(#"failed to load data, retrying...");
retryCount++;
if( retryCount < 5 ){
[self loadData];
return;
} else {
NSLog(#"failed after 5 retries");
}
}
NSString *card = [NSString stringWithFormat:#"%#-%#",
[[UserAccount sharedInstance] cardNumber],
cardPhoneToken];
});
}

Answer 2

Sounds familiar. :)
Change the block to:
^{
NSString *card;
if ([tokenData isKindOfClass [NSDictionary class]) {
card = [NSString stringWithFormat:#"%#-%#",
[[UserAccount sharedInstance] cardNumber],
[tokenData objectForKey:#"CardPhoneToken"]]; // <<-- No Problem anymore
} else {
// deal with the situation. Probably do:
card = [NSString stringWithFormat:"%#-no phone number given", [UserAccount sharedInstance] cardNumber]];
}
Alternative:
^{
id cardPhoneToken;
if ([tokenData]) {
cardPhoneToken = [tokenData objectForKey:#"CardPhoneToken"];
} else {
cardPhoneToken = #"no Phone Token"; // Or what ever you think is appropriate
}
NSString *card = [NSString stringWithFormat:#"%#-%#",
[[UserAccount sharedInstance] cardNumber],
cardPhoneToken]; // <<-- No Problem anymore
}