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该PR修复了iOS18系统版本下切换页面时候导航栏出现的错位和闪现的问题，以及带有透明导航栏和非透明导航栏之见的切换闪现问题。
1、主要问题原因
UINavigationBar在导航栏切换页面的时候，背景视图_UIBarBackground会先被移除并重新添加到UINavigationBar中，_UIBarBackground对象并未改变，但是其子视图状态会被设置为默认值。
2、问题修复办法
在UINavigationBar的-(void)didAddSubview:(UIView *)subview方法中监听_UIBarBackground的添加事件，重新刷新_UIBarBackground子视图的状态。