* [ios] add timer to main runloop so that timer could be triggered while scrolling.
* [ios] add timer to main runloop so that timer could be triggered while scrolling.

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