In Objective-C, how do I test the object type?

Question

I need to test whether the object is of type NSString or UIImageView. How can I accomplish this? Is there some type of "isoftype" method?

Answer 1

Yes there is:

[object isKindOfClass:[ClassName class]]

Answer 2

If your object is myObject, and you want to test to see if it is an NSString, the code would be:

[myObject isKindOfClass:[NSString class]]

Likewise, if you wanted to test myObject for a UIImageView:

[myObject isKindOfClass:[UIImageView class]]

Answer 3

See: In Objective-C what is the equivelant of the java “instanceof” keyword?

Answer 4

You would probably use

• (BOOL)isKindOfClass:(Class)aClass

This is a function of the NSObject.

For more info check the NSObject documentation.

This is how you use this.

BOOL test = [self isKindOfClass:[SomeClass class]];

You might also try doing somthing like this

    for(id element in myArray)
{
 NSLog(@"=======================================");
 NSLog(@"Is of type: %@", [element className]);
 NSLog(@"Is of type NSString?: %@", ([[element className] isMemberOfClass:[NSString class]])? @"Yes" : @"No");
 NSLog(@"Is a kind of NSString: %@", ([[element classForCoder] isSubclassOfClass:[NSString class]])? @"Yes" : @"No");

}

Answer 5

This worked better for me:

NSLog(@"=======================================");
        NSLog(@"Is of type: %@", [element class]);
        NSLog(@"Is of type NSString?: %@", ([[element class] isMemberOfClass:[NSString class]])? @"Yes" : @"No");
        NSLog(@"Is a kind of NSString: %@", ([[element classForCoder] isSubclassOfClass:[NSString class]])? @"Yes" : @"No");