与C＃中的'as'运算符等效的Objective-C

Question

Does Objective-C have a cast operator similar to 'as' operator in C# or the recommended way is to use isKindOfClass method to test the object and if yes cast the object to desired class?
In C# I do this:

Class1 o1 = obj as Class1;
if (o1 != null)
{
    // ...
}

In Objective-C should I go with this:

if ([obj isKindOfClass:[Class1 class]]) {
    Class1* o1 = (Class1*)obj;
    // ...
}

Answer 1

You are right, isKindOfClass is the correct Objective-C way to check if an object is an instance of a given class or an instance of a subclass.

But have a look at the answers of

• Objective-C dynamic_cast?

for various neat macros, categories and even a C++ template to provide a syntax that mimics the C++ dynamic_cast or the C# as operator.

Answer 2

class A { }
class B : A { }

A a = new A();
if(a.GetType() == typeof(A)) // returns true
{
}

A b = new B();
if(b.GetType() == typeof(A)) // returns false
{
}

or

test ts = new test();
            object ob = ts;

            if (typeof(test) == ob.GetType())
               {
                   return true;
               }