__unsafe_unretained for a delegate won't build

Question

I have this code (snippet) from a .h file:

#import 
#import \"ILView.h\"

/**
 * Controls the orientation of the picker
 */
typedef enum {
          


        

Answer 1

As the error message is telling you, the ivar:

@interface ILHuePickerView : ILView {
    id<ILHuePickerViewDelegate> delegate;    // <-- This is the ivar

needs to be declared __unsafe_unretained:

__unsafe_unretained id<ILHuePickerViewDelegate> delegate;

not the property:

@property (assign, nonatomic) IBOutlet id<ILHuePickerViewDelegate> delegate;

because the ARC ownership qualifiers don't apply to properties; they only apply to variables.

Since the @synthesize directive creates the ivar for you (with the correct ARC qualifier), however, you can just skip its declaration:

@interface ILHuePickerView : ILView 

/**
 * Delegate
 */
@property (assign, nonatomic) IBOutlet id<ILHuePickerViewDelegate> delegate;

// etc.

Which is, in fact, now the recommended procedure; see Defining Classes in TOCPL.

Answer 2

I've used ILColorPicker in the past, and it is definitely not ARC ready. Set -fno-objC-arc in the compiler flag settings for the ILColorPicker classes.