associated_obj.m

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associated_obj.m
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static char kAssociatedKey;
@implementation UIView (Custom)
- (void)setCustomData:(id)data {
   objc_setAssociatedObject(self, &kAssociatedKey, data,
                           OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (id)customData {
   return objc_getAssociatedObject(self, &kAssociatedKey);
}
@end
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