Update ios example for API changes and index rendering
Update ios example for API changes and index rendering

rxantos/imgui,elect86/imgui,dougbinks/imgui,Flix01/imgui,rxantos/imgui,ggtucker/imgui,Pagghiu/imgui,benoitjacquier/imgui,benoitjacquier/imgui,ggtucker/imgui,emoon/imgui,cmaughan/imgui,xythobuz/imgui,GHF/imgui,mikesart/imgui,wflohry/imgui-addons,luiseduardohdbackup/imgui,Psybrus/imgui,nmlgc/imgui,bkaradzic/imgui,andresv/imgui,neshume/imgui,aimotive/imgui-glfw,gyakoo/imgui,wasikuss/imgui,tom-seddon/imgui,luiseduardohdbackup/imgui,andresv/imgui,ocornut/imgui,redblobgames/imgui,rmoorman/imgui,nProtect/imgui,sakishum/imgui,twigletguy/imgui,seanmiddleditch/imgui,burningreggae/imgui,cmaughan/imgui,xythobuz/imgui,wasikuss/imgui,GHF/imgui,neshume/imgui,shaggytwodope/imgui,tom-seddon/imgui,mikesart/imgui,aimotive/imgui-glfw,Pagghiu/imgui,kylawl/imgui,sakishum/imgui,wangshijin/imgui,Psybrus/imgui,usagi/imguixx,gyakoo/imgui,Flix01/imgui,nmlgc/imgui,cmaughan/imgui,usagi/imguixx,xunmengfeng/imgui,Flix01/imgui,emoon/imgui,tpoechtrager/imgui,wangshijin/imgui,nProtect/imgui,thennequin/imgui,kylawl/imgui,shaggytwodope/imgui,cmaughan/imgui,ocornut/imgui,ocornut/imgui,rmoorman/imgui,twigletguy/imgui,bagobor/imgui,zho7611/imgui,ghassanpl/imgui,redblobgames/imgui,zho7611/imgui,burningreggae/imgui,ghassanpl/imgui,dougbinks/imgui,thevaber/imgui,bkaradzic/imgui,bagobor/imgui,thennequin/imgui,bkaradzic/imgui,tpoechtrager/imgui,wflohry/imgui-addons,thevaber/imgui,elect86/imgui,seanmiddleditch/imgui,ggtucker/imgui,xunmengfeng/imgui,nProtect/imgui