So I am trying to draw my first triangle using GLKit, but it’s not showing 

def Vertex(x = c_float, y = c_float, z = c_float, r = c_float, g = c_float, b = c_float, a = c_float):
        restype = None
        argtypes = [x, y, z, r, g, b, a]
        cfunc = c.glRotatef
        cfunc.restype = restype
        #cfunc.argtypes = argtypes
        return argtypes
Vertices = [
  Vertex(x=  1, y= -1, z= 0, r= 1, g= 0, b= 0, a= 1),
  Vertex(x=  1, y=  1, z= 0, r= 0, g= 1, b= 0, a= 1),
  Vertex(x= -1, y=  1, z= 0, r= 0, g= 0, b= 1, a= 1),
  Vertex(x= -1, y= -1, z= 0, r= 0, g= 0, b= 0, a= 1),
]

vf = [
   -1.0, -1.0, 0.0,
   1.0, -1.0, 0.0,
   0.0,  1.0, 0.0,
    ]
intvf = [
   -1, -1, 0,
   1, -1, 0,
   0,  1, 0,
    ]
vertdata = (ctypes.c_float * len(vf))(*vf)
#print(dir(c))

def glkView_drawInRect_(_self, _cmd, view, rect):
    r, g, b = colorsys.hsv_to_rgb((time.time() * 0.1) % 1.0, 1, 1)
    glClearColor(r, g, b, 1.0)
    vertexBuffer = GLES1.GLuint()
    GLES2.glGenBuffers(1, ctypes.byref(vertexBuffer), GLES1.GLsizei, ctypes.POINTER(GLES1.GLuint))
    GLES2.glBindBuffer(GLES2.GL_ARRAY_BUFFER, vertexBuffer)
    v = vertdata
    lv = len(v)
    va = (GLES2.GLfloat * len(v))
    GLES2.glBufferData(
    GLES2.GL_ARRAY_BUFFER,
    lv,
    v,
    GLES2.GL_STATIC_DRAW,
    voiddata_t=va)
    #self.vertexBuffer = vertexBuffer
    #_loaded_vbos[self.file] = {frame_id: vertexBuffer}
    GLES2.glBindBuffer(GLES2.GL_ARRAY_BUFFER, 0)

    GLES2.glEnableVertexAttribArray(0);
    GLES2.glDrawArrays(GLES2.GL_TRIANGLES, 0, 3);

    glClear(GL_COLOR_BUFFER_BIT)