CODEWITHSUNDEEP
iosnsdictionary
Atma
Atma

Reputation: 29767

receiving collection element of type int is not an objective c object in iOS

I have the following dictionary:

NSDictionary* jsonDict = @{
                               @"firstName": txtFirstName.text,
                               @"lastName": txtLastName.text,
                               @"email": txtEmailAddress.text,
                               @"password": txtPassword.text,
                               @"imageUrl": imageUrl,
                               @"facebookId": [fbId integerValue],
                              };

In the last element, I need to use an integer, but I am receiving the error:

collection element of type int is not an objective c object

How can I use an int value in this element?

Upvotes: 20

Views: 26482

Answers (6)

Pratik Sodha
Pratik Sodha

Reputation: 3727

You have to use @(%value%) for non pointer datatype value store in Dictionary. 

@"facebookId": @(fbId)

Upvotes: 2

Himanshu padia
Himanshu padia

Reputation: 7712

assuming fbID is an int then It should be like:

@"facebookId": @(fbId)

Upvotes: 8

Atma
Atma

Reputation: 29767

I ended up using an NSNumber:

NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
    [f setNumberStyle:NSNumberFormatterDecimalStyle];
    NSNumber * myNumber = [f numberFromString:fbId];
    [f release];

Upvotes: -1

staticVoidMan
staticVoidMan

Reputation: 20244

should be:

@"facebookId": [NSNumber numberWithInt:[fbId intValue]];

NSDictionary works with objects only and as a result, we can't store simply ints or integers or bools or anyother primitive datatypes.

[fbId integerValue] returns a primitive integer value (which is not an object)
Hence we need to encapsulate primitive datatypes and make them into objects. which is why we need to use a class like NSNumber to make an object to simply store this crap.

more reading: http://rypress.com/tutorials/objective-c/data-types/nsnumber.html

Upvotes: 69

Chris
Chris

Reputation: 1673

NSDictionary can only hold objects (e.g. NSString, NSNumber, NSArray, etc.), not primitive values (e.g. int, float, double, etc.). The same goes for almost all encapsulation in Objective-C. To store numbers, use NSNumber:

NSDictionary *dictionary = @{@"key" : [NSNumber numberWithInt:integerValue]]};

Upvotes: 1

karim
karim

Reputation: 15589

OR, assuming fbID is an NSString,

@"facebookId": @([fbId intValue]);

its like autoboxing in Java. @ converts any primitive number to NSNumber object.

Upvotes: 6

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