behavior instance class

gistfile1.txt

/*
http://www.objc.io/issue-13/behaviors.html
behavior instance basic
*/
@interface KZBehavior : UIControl

//! object that this controller life will be bound to
@property(nonatomic, weak) IBOutlet id owner;

@end


@implementation KZBehavior

- (void)setOwner:(id)owner
{
    if (_owner != owner) {
        [self releaseLifetimeFromObject:_owner];
        _owner = owner;
        [self bindLifetimeToObject:_owner];
    }
}

- (void)bindLifetimeToObject:(id)object
{
    objc_setAssociatedObject(object, (__bridge void *)self, self, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void)releaseLifetimeFromObject:(id)object
{
    objc_setAssociatedObject(object, (__bridge void *)self, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

@end