Associated Objects
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Associated Objects—或者 Associative References,正如他们起初所被认识的那样—是Objective-C 2.0 runtime的特征,在OS X Snow Leopard(IOS 4)中被引进。具体指的就是
@interface NSObject (AssociatedObject)@property (nonatomic, strong) id associatedObject;@end
NSObject+AssociatedObject.m
@implementation NSObject (AssociatedObject)@dynamic associatedObject;- (void)setAssociatedObject:(id)object { objc_setAssociatedObject(self, @selector(associatedObject), object, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (id)associatedObject { return objc_getAssociatedObject(self, @selector(associatedObject));}
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