chinese-input-method-setup-on-i3wm-with-ibus

sudo pacman -S ibus ibus-libpinyin

sudo vim /etc/environment
# Add then :wq
GTK_IM_MODULE=ibus
QT_IM_MODULE=ibus
XMODIFIERS=@im=ibus

vim ~/.config/i3/config
# Add then :wq
exec ibus-daemon -rdx

reboot

ibus-setup

alt+space is prefered.