For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:weearcm/openSUSE_Tumbleweed/home:weearcm.repo
zypper refresh
zypper install swig
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:weearcm/openSUSE_Slowroll/home:weearcm.repo
zypper refresh
zypper install swig
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:weearcm/15.6/home:weearcm.repo
zypper refresh
zypper install swig