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UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom]; btn.tag = 100; NSLog(@"%d",btn.tag); objc_setAssociatedObject(self, &overviewKey, btn, OBJC_ASSOCIATION_RETAIN); UIButton * btn1 = objc_getAssociatedObject(self, &overviewKey); btn1.tag =111; NSLog(@"%d",btn1.tag);
static char flashColorKey; - (void) setFlashColor:(UIColor *) flashColor{ objc_setAssociatedObject(self, &flashColorKey, flashColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC); } - (UIColor *) getFlashColor{ return objc_getAssociatedObject(self, &flashColorKey); }
通过关联之后传值动态获取
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原文地址：http://www.cnblogs.com/keyan1102/p/4566766.html
