Can you help me how I can customize cancel and post buttons in SLComposeServiceViewController?
I want to change title and button image.
SLComposeServiceViewController has very limited options for customizing its UI, and this does not currently include the ability to modify the "cancel" and "post" buttons. In the current version of iOS, the only way to avoid using those buttons is to not use SLComposeServiceViewController. Share extensions are not required to use that class and may use a fully custom UI. If those buttons are not appropriate, that's your only option.