21 lines
537 B
Objective-C
21 lines
537 B
Objective-C
#import <Foundation/Foundation.h>
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#import <objc/runtime.h>
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static void *fooKey = &fooKey; // one way to define a unique key is a pointer variable that points to itself
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int main (int argc, const char *argv[]) {
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@autoreleasepool {
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id e = [[NSObject alloc] init];
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// set
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objc_setAssociatedObject(e, fooKey, @1, OBJC_ASSOCIATION_RETAIN);
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// get
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NSNumber *associatedObject = objc_getAssociatedObject(e, fooKey);
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NSLog(@"associatedObject: %@", associatedObject);
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}
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return 0;
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}
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