Instance Method

isKind(of:)

Returns a Boolean value that indicates whether the receiver is an instance of given class or an instance of any class that inherits from that class.

Required.

Declaration

func isKind(of aClass: AnyClass) -> Bool

Parameters

aClass

A class object representing the Objective-C class to be tested.

Return Value

true if the receiver is an instance of aClass or an instance of any class that inherits from aClass, otherwise false.

Discussion

For example, in this code, isKind(of:) would return true because, in Foundation, the NSArchiver class inherits from NSCoder:

NSMutableData *myData = [NSMutableData dataWithCapacity:30];
id anArchiver = [[NSArchiver alloc] initForWritingWithMutableData:myData];
if ( [anArchiver isKindOfClass:[NSCoder class]] )
    ...

Be careful when using this method on objects represented by a class cluster. Because of the nature of class clusters, the object you get back may not always be the type you expected. If you call a method that returns a class cluster, the exact type returned by the method is the best indicator of what you can do with that object. For example, if a method returns a pointer to an NSArray object, you should not use this method to see if the array is mutable, as shown in the following code:

// DO NOT DO THIS!
if ([myArray isKindOfClass:[NSMutableArray class]])
{
    // Modify the object
}

If you use such constructs in your code, you might think it is alright to modify an object that in reality should not be modified. Doing so might then create problems for other code that expected the object to remain unchanged.

If the receiver is a class object, this method returns true if aClass is a Class object of the same type, false otherwise.

See Also

Testing Object Inheritance, Behavior, and Conformance

func isMember(of: AnyClass) -> Bool

Returns a Boolean value that indicates whether the receiver is an instance of a given class.

Required.

func responds(to: Selector!) -> Bool

Returns a Boolean value that indicates whether the receiver implements or inherits a method that can respond to a specified message.

Required.

func conforms(to: Protocol) -> Bool

Returns a Boolean value that indicates whether the receiver conforms to a given protocol.

Required.