iPhone how to check the type of an Object?

Question

I want to check the type of an Object. How can I do that?

The scenario is I\'m getting an object. If that object is of type A then do some operations. If it is of ty

Answer 1

if([some_object isKindOfClass:[A_Class_Name class]])
{
    // do somthing
}

Answer 2

A more common pattern in Objective-C is to check if the object responds to the methods you are interested in. Example:

if ([object respondsToSelector:@selector(length)]) {
    // Do something
}

if ([object conformsToProtocol:@protocol(NSObject)]) {
    // Do something
}

Answer 3

There are some methods on NSObject that allow you to check classes.

First there's -class which will return the Class of your object. This will return either AViewController or BViewController.

Then there's two methods, -isKindofClass: and isMemberOfClass:.

-isKindOfClass: will compare the receiver with the class passed in as the argument and return true or false based on whether or not the class is the same type or a subclass of the given class.

-isMemberOfClass: will compare the receiver with the class passed in as the argument and return true or false based on whether or not the class is strictly the same class as the given class.