Apple warned about supply-chain problems when it disclosed its latest results. Photograph by Greg Baker/AFP/Getty Images China loves the Apple iPhone. That is a combination that has the potential to drive better-than-expected financial results for Apple’s June quarter. The iPhone has come to dominate Apple’s financial performance, accounting for 55% of revenue in the first half of the September 2022 fiscal year, not counting any contribution from the App Store or other services revenue. China, meanwhile, represented 20% of Apple’s (ticker: AAPL) revenue in the same period. Apple shares have slumped about 9% since the company reported financial results on...