* [ios] fix compiler complains
* [ios] fix compiler complains

Neeeo/incubator-weex,miomin/incubator-weex,KalicyZhou/incubator-weex,Hanks10100/weex,kfeagle/weex,dianwodaMobile/DWeex,Hanks10100/incubator-weex,misakuo/incubator-weex,boboning/weex,dianwodaMobile/DWeex,alibaba/weex,cxfeng1/incubator-weex,KalicyZhou/incubator-weex,misakuo/incubator-weex,alibaba/weex,miomin/incubator-weex,HomHomLin/weex,acton393/incubator-weex,MrRaindrop/weex,erha19/incubator-weex,acton393/weex,leoward/incubator-weex,kfeagle/weex,kfeagle/weex,Hanks10100/weex,xiayun200825/weex,Neeeo/incubator-weex,KalicyZhou/incubator-weex,Hanks10100/incubator-weex,cxfeng1/incubator-weex,Neeeo/incubator-weex,miomin/incubator-weex,Hanks10100/weex,xiayun200825/weex,erha19/incubator-weex,leoward/incubator-weex,cxfeng1/weex,KalicyZhou/incubator-weex,acton393/incubator-weex,dianwodaMobile/DWeex,LeeJay0226/weex,cxfeng1/weex,MrRaindrop/incubator-weex,misakuo/incubator-weex,MrRaindrop/weex,yuguitao/incubator-weex,alibaba/weex,alibaba/weex,HomHomLin/weex,LeeJay0226/weex,acton393/incubator-weex,misakuo/incubator-weex,yuguitao/incubator-weex,erha19/incubator-weex,yuguitao/incubator-weex,cxfeng1/incubator-weex,HomHomLin/weex,Hanks10100/incubator-weex,Hanks10100/incubator-weex,boboning/weex,weexteam/incubator-weex,miomin/incubator-weex,misakuo/incubator-weex,miomin/incubator-weex,erha19/incubator-weex,acton393/incubator-weex,LeeJay0226/weex,MrRaindrop/weex,HomHomLin/weex,HomHomLin/weex,boboning/weex,cxfeng1/weex,Neeeo/incubator-weex,LeeJay0226/weex,MrRaindrop/incubator-weex,acton393/incubator-weex,yuguitao/incubator-weex,xiayun200825/weex,miomin/incubator-weex,Neeeo/incubator-weex,cxfeng1/incubator-weex,cxfeng1/incubator-weex,misakuo/incubator-weex,weexteam/incubator-weex,erha19/incubator-weex,dianwodaMobile/DWeex,alibaba/weex,cxfeng1/incubator-weex,leoward/incubator-weex,MrRaindrop/incubator-weex,acton393/weex,Hanks10100/weex,weexteam/incubator-weex,Hanks10100/weex,weexteam/incubator-weex,KalicyZhou/incubator-weex,boboning/weex,leoward/incubator-weex,xiayun200825/weex,boboning/weex,acton393/incubator-weex,MrRaindrop/weex,miomin/incubator-weex,acton393/weex,cxfeng1/weex,kfeagle/weex,erha19/incubator-weex,LeeJay0226/weex,yuguitao/incubator-weex,LeeJay0226/weex,erha19/incubator-weex,Hanks10100/incubator-weex,dianwodaMobile/DWeex,miomin/incubator-weex,Hanks10100/weex,acton393/incubator-weex,weexteam/incubator-weex,acton393/incubator-weex,MrRaindrop/incubator-weex,cxfeng1/weex,HomHomLin/weex,boboning/weex,leoward/incubator-weex,alibaba/weex,Hanks10100/incubator-weex,kfeagle/weex,acton393/weex,acton393/weex,Hanks10100/incubator-weex,xiayun200825/weex,KalicyZhou/incubator-weex,MrRaindrop/weex,leoward/incubator-weex,MrRaindrop/weex,MrRaindrop/incubator-weex,yuguitao/incubator-weex,Hanks10100/incubator-weex,MrRaindrop/incubator-weex,erha19/incubator-weex,alibaba/weex,kfeagle/weex,Neeeo/incubator-weex,cxfeng1/weex,weexteam/incubator-weex,xiayun200825/weex,dianwodaMobile/DWeex,acton393/weex