fixes for arm64 arch, you need to export ARCH=armv7 or arm64 in order…

… to have the right call. This is untested. Closes #17

pyobjus/pyobjus.pyx

@@ -412,8 +412,12 @@ cdef class ObjcMethod(object):
                 dprint("x86_64 architecture {0} call".format(fun_name), of_type='i')
 
             ELIF PLATFORM == 'ios':
-                ffi_call(&self.f_cif, <void(*)()>objc_msgSend_stret, res_ptr, f_args)
-                dprint('ios platform objc_msgSend_stret call')
+                IF ARCH == 'arm64':
+                    ffi_call(&self.f_cif, <void(*)()>objc_msgSend, res_ptr, f_args)
+                    dprint('ios(arm64) platform objc_msgSend call')
+                ELSE:
+                    ffi_call(&self.f_cif, <void(*)()>objc_msgSend_stret, res_ptr, f_args)
+                    dprint('ios(armv7) platform objc_msgSend_stret call')
 
             ELSE:
                 dprint("UNSUPPORTED ARCHITECTURE! Program will exit now...", of_type='e')

setup.py

@@ -3,9 +3,11 @@
 from os.path import dirname, join, exists
 import sys
 import subprocess
+import platform
 
 dev_platform = sys.platform
 kivy_ios_root = environ.get('KIVYIOSROOT', None)
+arch = environ.get('ARCH', platform.machine())
 if kivy_ios_root is not None:
     dev_platform = 'ios'
 
@@ -24,7 +26,8 @@
 # create a configuration file for pyobjus (export the platform)
 config_pxi_fn = join(dirname(__file__), 'pyobjus', 'config.pxi')
 config_pxi_need_update = True
-config_pxi = 'DEF PLATFORM = "{}"'.format(dev_platform)
+config_pxi = 'DEF PLATFORM = "{}"\n'.format(dev_platform)
+config_pxi += 'DEF ARCH = "{}"'.format(arch)
 if exists(config_pxi_fn):
     with open(config_pxi_fn) as fd:
         config_pxi_need_update = fd.read() != config_pxi