CODEWITHSUNDEEP
objective-c
casillas
casillas

Reputation: 16793

isKindofClass for id

I have the following code, which is pre-defined NSArray but I assign it to an id variable.

I display the output and want to display class name even though it shows <__NSArrayI ..... > on the output window, but I am getting an empty description as follows. How could I get class of dic1 ? 

id dic1 =@[@{@"id":@"1",@"name":@"Test 1 "},@{@"id":@"2",@"name":@"Test 2"}];

(lldb) po dic1
<__NSArrayI 0x100300090>(
{
    id = 1;
    name = "Test 1 ";
},
{
    id = 2;
    name = "Test 2";
}
)

(lldb) po [dic1 isKindOfClass:[NSArray class]]
<object returned empty description>

UPDATE 

(lldb) p [dic1 isKindOfClass:[NSArray class]]
error: no known method '-isKindOfClass:'; cast the message send to the method's return type

Upvotes: 2

Views: 1141

Answers (1)

rmaddy
rmaddy

Reputation: 318794

Here's an answer that summarizes all of the comments.

  1. Use po to print the result of an object type. Use p to print the result of a primitive type.
  2. isKindOfClass: returns a BOOL so you need to use p, not po.

  3. Since dic1 is an id, the debugger isn't sure what the isKindOfClass: method is so it doesn't know its return type. Add a cast to make it clear:

    p (BOOL)[dic1 isKindOfClass:[NSArray class]]

    or you can also do:

    p [(NSObject *)dic1 isKindOfClass:[NSArray class]]
  4. Normally you wouldn't want to use id for dic1 but since this is a learning exercise, do what you want. :)

Upvotes: 4

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