【GCanvas】iOS SendVertexBufferToGPU Crash

[jianxiongc]

在iOS 渲染成功后放置几分钟再这里崩溃

`
GCanvas2dContext.cpp
void GCanvasContext::SendVertexBufferToGPU(const GLenum geometry_type)
{
if (mVertexBufferIndex == 0)
{
return;
}

glDrawArrays(geometry_type, 0, mVertexBufferIndex); // Crash Thread 1: EXC_BAD_ACCESS (code=1, address=0x0)
mVertexBufferIndex = 0;
}
`
另外是渲染完成后 ，Log会一直打是否正常？

[YorkShen]

This is not the place to report bugs for weex or gcanvas, you should report bug in other repo