使用运行时动态创建属性

类中添加name属性：

@property (nonatomic,copy) NSString *name;

static const void *kViewControllerName = &kViewControllerName;

- (void)setName:(NSString *)name {

objc_setAssociatedObject(self, kViewControllerName, name, OBJC_ASSOCIATION_COPY_NONATOMIC);

}

- (NSString *)name {

NSString *myName = objc_getAssociatedObject(self, kViewControllerName);

return myName;

}