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Editorial Team
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Asked: 2026-05-31T05:48:21+00:00

I’m playing with the mapkit and setting up some annotations. somewhere in my code

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I’m playing with the mapkit and setting up some annotations. somewhere in my code I have :-

#define ANNOTATION_FIRST_TYPE 1

unsigned char annoType = ANNOTATION_FIRST_TYPE

annotationView = (MKPinAnnotationView *) [_mapView dequeueReusableAnnotationViewWithIdentifier:annoType ];

The last line above throws the error Implicit conversion of 'char' to 'NSString *' is disallowed with ARC, which is fair enough, I need to explicitly change the annoType to a NSString.

But the odd thing is; if for line (3) I had the below instead :-

annotationView = (MKPinAnnotationView *) [_mapView dequeueReusableAnnotationViewWithIdentifier:**ANNOTATION_FIRST_TYPE**];

It compiles without error?
Question is, what is the type of ANNOTATION_FIRST_TYPE?

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1 Answer

  1. Editorial Team

    ANNOTATION_FIRST_TYPE is an integer. An integer can be implicitly converted to a pointer in C, but if you have enabled warnings the compiler should have warned you about this. I don’t know why this isn’t a compiler error, probably just an oversight.

    You should define ANNOTATION_FIRST_TYPE as an NSString, e.g.

    #define ANNOTATION_FIRST_TYPE @"1"
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