objc_setAssociatedObject 的应用

绑定值 绑定 objc_setAssociatedObject(btn, "firstObject", firsrString, OBJC_ASSOCIATION_RETAIN_NONATOMIC); 获取css objc_getAssociatedObject(sender, "firstObject"); 2.为现有对象添加新属性 @property(nonatomic,copy)NSStri
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