重点
Xamarin.Forms 3.2 之后新增了一个 feature: TitleView， 以便开发者能够更灵活的自定义 NavigationBar.
一些可能会有用的链接
- Add ToolbarItem on the left side of NavigationBar in Xamarin.Forms on Android?
- Move a Button in the NavigationBar from the right side to the left in a custom page renderer in Android
- Change searchbar cancel button image in xamarin forms
- Change navigation page back button in xamarin forms
- Displaying Views in the Navigation Bar
- Xamarin.Forms TitleView Sample code
