method compiled a shader code

compileShader

func compileShader(code: String, shaderType: GLenum) -> GLuint {
        var shader = glCreateShader(shaderType)

        var cStringSource = (code as NSString).UTF8String
        let stringfromutf8string = String.fromCString(cStringSource)

        glShaderSource(shader, GLsizei(1), &cStringSource, nil)
        glCompileShader(shader);

        var isCompiled: GLint = 0
        glGetShaderiv(shader, GLenum(GL_COMPILE_STATUS), &isCompiled)
        //NSLog(" is compiled : %i ", isCompiled)

        if isCompiled == 0 {
            var infolen: GLsizei = 0
            var stringLen: GLsizei = 1024
            glGetShaderiv(shader, GLenum(GL_INFO_LOG_LENGTH), &infolen)

            var info: [GLchar] = Array(count: Int(stringLen), repeatedValue: GLchar(0))
            var lenActual: GLsizei = 0

            glGetShaderInfoLog(shader, stringLen, &lenActual, UnsafeMutablePointer(info))
            NSLog(String(UTF8String:info)!)
        }

        return shader
    }