如何在 Objective-C 中测试类类型？

Question

I'm trying to use -isKindOfClass: to test for the class type but it doesn't work for me when I store the class type in a variable.

Here is an example. What am I missing?

@interface MyClass : NSObject
@end

@implementation MyClass
@end

Class classType = [MyClass class];

[classType isKindOfClass:[MyClass class]]; // returns NO

classType == [MyClass class]; // returns YES

Answer 1

The problem is that MyClass does not inherit from MyClass.

isKindOfClass works the way you expect when you use it as an instance method:

[[classType new] isKindOfClass:[MyClass class]]; // YES

But when you use it as a class method, it tests inheritance:

[classType isKindOfClass:[NSObject class]]; // YES

If you want to know whether classType is [MyClass class] , use == , exactly as you are doing.