Objective-C: Property / instance variable in category

Question

As I cannot create a synthesized property in a Category in Objective-C, I do not know how to optimize the following code:

@interface MyClass (Variant)
@prope         


        

Answer 1

Tested only with iOS 9 Example: Adding an UIView property to UINavigationBar (Category)

UINavigationBar+Helper.h

#import 

@interface UINavigationBar (Helper)
@property (nonatomic, strong) UIView *tkLogoView;
@end

UINavigationBar+Helper.m

#import "UINavigationBar+Helper.h"
#import 

#define kTKLogoViewKey @"tkLogoView"

@implementation UINavigationBar (Helper)

- (void)setTkLogoView:(UIView *)tkLogoView {
    objc_setAssociatedObject(self, kTKLogoViewKey, tkLogoView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (UIView *)tkLogoView {
    return objc_getAssociatedObject(self, kTKLogoViewKey);
}

@end