No declaration of property error in Objective-C

Question

I wonder what is wrong with this?

.h file:

typedef enum {
    N4LoupeTypeRound,
    N4LoupeTypeRectangle,
} N4LoupeType;

@interface N4LoupeLayer : CALayer {
    N4LoupeType _type;
    UIView *_originalView;
    CALayer *_mask;
    CALayer *_overlay;
}

@property (nonatomic) N4LoupeType type;
@property (nonatomic, assign) UIView *originalView;

@end

.m file:

#import "N4LoupeLayer.h"

@interface N4LoupeLayer (Privates)

@property (nonatomic, retain) CALayer *mask;
@property (nonatomic, retain) CALayer *overlay;

@end

@implementation N4LoupeLayer

@synthesize type = _type;
@synthesize originalView = _originalView;
@synthesize mask = _mask;
@synthesize overlay = _overlay; // ******I GET THE ERROR HERE********* 

@end

No declaration of property 'overlay' found in the interface in N4LoupeLayer.m

Answer 1

You defined the properties for the category Privates, but you are trying to synthesize them in N4LoupeLayer.

Answer 2

is this ok about the trailing ',' after lat member of the enum?

typedef enum {
    N4LoupeTypeRound,
    N4LoupeTypeRectangle,
} N4LoupeType;

I have got no other problems, since i havent use enum yet :(