At the time, the Trump administration had just blacklisted Huawei, and simmering US-China tensions made life harder for companies deeply reliant on the Asian nation. Apple’s Chinese revenue fell in fiscal 2019 and 2020, before rebounding in 2021. The company generates about a fifth of its sales from China, which is also the heart of Apple’s supply chain. The question now is whether Apple will face a repeat of 2019. The growing government bans are an ominous sign. Workers at agencies and state-owned companies are increasingly barred from using iPhones at the office. The news has sent Apple’s shares sliding…