How to log class name in Xcode debugger

Question

I have an object that is of a type id . This object can be one of my custom classes instance. Is there a way I can log its class name?

I tried casting it to NSObject but I got an error.

error: C-style cast from 'id' to 'NSObject' is not allowed

Here full output of the console:

Answer 1

The class of an object is again an Objective-C object , so use po instead of p :

po [object class]

po is an abbreviation for expression -o -- and prints the description of the expression.

---

Your error is caused by the fact that id is a pointer and must be cast to NSObject * , not to NSObject . So this would work as well:

p [(NSObject *)object class]

Alternatively, cast the method's return type, as suggested by the lldb error message:

p (Class)[object class]

But po is the simplest solution for your problem.

Answer 2

您可以在命令窗口中键入以下内容以打印到类名：

po NSStringFromClass([object class])

Answer 3

None of these answers worked for me. So FWIW I do this:

• ObjC: po variableName.class
• Swift: po type(of: variableName)