CODEWITHSUNDEEP
objective-cnsmutabledictionary
cooltodinesh
cooltodinesh

Reputation: 225

Unable to retrieve value for key from NSMutableDictionary though it has data

I have code like below :

1.I have below method as action for one button.

(IBAction)enableDisableFB:(id)sender {//have below local variable
NSMutableDictionary *fbLocationLatitude = [[NSMutableDictionary alloc] init];

2.There is a loop in which i set objects in this dictionary like

[fbLocationLatitude setObject:latitude forKey:locID]; //here latitude and locID both are NSString

3.In Another loop in same method, I am trying to retrieve value but it gives (null) in NSLog

NSLog(@"latitude for key %@ = %@",locID, [fbLocationLatitude objectForKey:locID]);
//above statement gives me output -> latitude for key 114943251851302 = (null)

But right after loop I print complete dictionary using 

NSLog(@"location dictionary = %@",fbLocationLatitude);
//which gives me below output. Sample given

location dictionary = {
    114943251851302 = "40.4414";
    109782595706984 = "38.9966";
    108867759137051 = "22.47";
    110148382341970 = "25.7877";
    107611279261754 = "43.1655";
    111803735513513 = "27.1828";
    109155699106505 = "18.3167";
    103734539665100 = "19.09";

This has the value for key I am searching for but same I am unable to get using objectForKey. Please help me to resolve this problem.

for (NSUInteger i =0; i< [fbLocationID count];i++)
{
    // NSLog(@"person creation");
    NSString *locID = [NSString stringWithString:[fbLocationID objectAtIndex:i]];
    NSLog(@"latitude for key %@ = %@",locID, [fbLocationLatitude objectForKey:locID]);                             
}
NSLog(@"location dictionary = %@",fbLocationLatitude);

This is how code is. I also tried to print class of keys using below code

for (id ik in [fbLocationLatitude allKeys])
{
const char* classname=class_getName([ik class]);
NSLog(@"class of key %s",classname);
}

and I am getting ans as : class of key NSDecimalNumber Though type casting locID to NSDecimalNumber, I don't get exact value of key but only null. Please help to resolve this.

Upvotes: 0

Views: 240

Answers (2)

Bryan
Bryan

Reputation: 12190

The keys are NSDecimalNumber, but you are starting with an NSString, so you can extract the data like this:

NSDecimalNumber locIDnumber = [NSDecimalNumber decimalNumberWithString: locID];
id latitude = [fbLocationLatitude objectForKey:locIDnumber];
NSLog(@"latitude for key %@ = %@", locID, latitude);

You say you tried a cast, but this doesn't perform any conversion from one object type to another; you need a method like decimalNumberWithString:

Upvotes: 1

Paresh Navadiya
Paresh Navadiya

Reputation: 38239

check like this:

if([[fbLocationLatitude objectForKey:locID] isKindofClass:[NSNumber class]])
{
   NSNumber *num = fbLocationLatitude objectForKey:locID];
}
else if([[fbLocationLatitude objectForKey:locID] isKindofClass:[NSString class]])
{
   NSString *strnum = fbLocationLatitude objectForKey:locID];
}

Upvotes: 0

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