我正在使用REFrostedViewController。
当我使用两个带有mapView的uiViewController时，我在切换beetwen一个uiViewController和第二个uiViewController时遇到错误。
我的错误是：
[__NSCFData backdropView:willChangeToGraphicsQuality:]: unrecognized selector sent to instance 0x14e95230
2014-06-12 15:24:29.411 App[4858:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFData backdropView:willChangeToGraphicsQuality:]: unrecognized selector sent to instance 0x14e95230'