问题
I am seeing this crash when adding a SKEmitterNode to a scene. Is there anyway to control the "index" through the interface or is it a Metal bug? I tried setting YES to the PrefersOpenGL flag in the info.plist, but it doesnt work.
2015-12-19 22:49:41.967 appname[4190:1827024] Jet: draw_indexed: indexType must be 'unsigned_int' or 'unsigned_short'
Assertion failed: (indexType == jet_component_type_unsigned_int || indexType ==
jet_component_type_unsigned_short), function draw_indexed, file /BuildRoot/Library/Caches/com.apple.xbs/Sources/Jet/Jet-1.50.1/Jet/jet_context_Metal.mm, line 1275.
来源：https://stackoverflow.com/questions/34376283/jet-draw-indexed-crash-on-ios-9-2-device