fix issue #64
fix issue #64

pinkowitz/WYPopoverController,iv-mexx/WYPopoverController,orta/WYPopoverController,vitalys/WYPopoverController,nicolaschengdev/WYPopoverController,sammcewan/WYPopoverController,richiewoo/WYPopoverController,Kingside/WYPopoverController,Eveian/WYPopoverController,dannys42/WYPopoverController,brittonmobile/WYPopoverController,xswm1123/WYPopoverController,netcosports/WYPopoverController,appone/WYPopoverController,Medium/WYPopoverController,CODE4APPLE/WYPopoverController,thelearningclinic/WYPopoverController,huntit/WYPopoverController,Voxer/WYPopoverController,Mindera/WYPopoverController,lijie121210/WYPopoverController,jiamaozheng/WYPopoverController