摘要：参考: http://stackoverflow.com/questions/2777438/how-to-tell-if-uiviewcontrollers-view-is-visibleif (viewController.isViewLoaded && viewController.view. 阅读全文

摘要：参考: http://nscookbook.com/2013/01/ios-programming-recipe-10-adding-a-shadow-to-uiview/ shadowOffset is a CGSize representing how far to offset the sha 阅读全文

摘要：参考: http://rypress.com/tutorials/objective-c/propertiesPropertiesAn object’s properties let other objects inspect or change its state. But, in a well- 阅读全文