我创建了一个带有XIB的CustomView:UIView，为NSInteger属性加载和添加观察者，如下所示://自定义View.h@interfaceCustomView:UIView@property(nonatomic)NSIntegerinputStateControl;@end//自定义View.mstaticvoid*kInputStateControlObservingContext=&kInputStateControlObservingContext;@implementationCustomView-(id)init{self=[superinit];if(sel