.h
@interface UIView (ObjectTagAdditions)
@property (nonatomic, retain) id objectTag;
@end
.m
#import <objc/runtime.h>
static char const * const ObjectTagKey = "ObjectTag";
@implementation UIView (ObjectTagAdditions)
@dynamic objectTag;
- (id)objectTag {
return objc_getAssociatedObject(self, &ObjectTagKey);
}
- (void)setObjectTag:(id)newObjectTag {
objc_setAssociatedObject(self, &ObjectTagKey, newObjectTag, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
Cited from : http://oleb.net/blog/2011/05/faking-ivars-in-objc-categories-with-associative-references/
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February 5, 2015 at 8:33 am
If you copy the UIView instance that has objectTag value to new instance. The new instance won’t hold the objectTag value, so manually set the objectTag value.
UIView newView = [oldView copy];
newView.objectTag = oldView.objectTag;