custom renderers:
http://www.wintellect.com/devcenter/jprosise/supercharging-xamarin-forms-with-custom-renderers-part-1
xamarin插件
https://github.com/jamesmontemagno/Xamarin.Plugins
techidea技术，封闭制造壁垒，开源促进进步。 https://github.com/chaozaiai |
custom renderers:
http://www.wintellect.com/devcenter/jprosise/supercharging-xamarin-forms-with-custom-renderers-part-1
xamarin插件
https://github.com/jamesmontemagno/Xamarin.Plugins
