Objective-c-Container element conversion Nsinteger

The Get element method for the container (Nsmutablearray, nsmutabledictionary) Objectforkey: Returns the ID type,
Convert Nsinteger type, using IntegerValue.

// newQuestion is an NSDictionary defined somewhereNSInteger questionId = [[newQuestion objectForKey:@"question_id"] integerValue];

Just to is clear, the compiler won ' t complain about sending a message to an ID, instead if the object isn ' t really an OB Ject (a struct or primitive), or doesn ' t respond to the message, you'll get a exception at runtime (not at build).

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Objective-c-Container element conversion Nsinteger