Apple (NASDAQ: AAPL) chief executive Tim Cook met some of China's hottest app developers and used a Didi Chuxing car to visit Apple's store in the popular shopping district Wangfujing on Monday, after arriving in Beijing for a charm offensive.

Apple announced on May 13 that it had invested $1 billion in Didi Chuxing , a Chinese app that offers ride-hailing services similar to Uber in the U.S.

At the Apple store, Cook attended a seminar hosted by Didi Chuxing's President Jean Lui, also known as Liu Qing, and attended by the founders and CEOs of some of China's top app providers, including Groupon-like Meituan, picture-editing app MeituPic, news content provider Toutiao.com, culinary app DayDayCook and game developer Tap4Fun.

According to local media, the Apple boss told the app developers that their innovative work was consistent with Apple's "spirit."

Cook also reportedly said that government policy played an important role in developing China's digital economy, and that the California-based tech giant was keen to work with China on this.

After the seminar, Cook posted two photos of himself and Liu on his official Weibo account and said, "Enjoyed sharing a taxi ride this morning to the Apple Store Wangfujing. Thanks, Jean Liu and Didi Chuxing!"

And in a formal statement, Liu recalled Didi Chuxing's development - the service was created from the merger of two ride-hailing apps, Didi and Kuaidi, before rebranding itself in April as Didi Chuxing, which means "honk, honk, commute" in Chinese - since first appearing in Apple's App Store in 2012.

"Now we are serving over 300 million users with eight product lines. Every day over 11 million rides are completed on our platform" Liu said.

"Meanwhile, our collaboration with Apple enters into a new stage. There are many similar stories like ours. Apple and the App Store are not only the role model of the entire tech world, they are also the grass root platform for aspiring innovators. This is where dreams take off."

Although the visit had not been officially confirmed by Apple, Cook was expected to visit China to woo government officials after suffering a series of setbacks in its biggest overseas markets. Reuters broke the news of his impending visit on May 6.

At its second-quarter results announcement in April, Apple revealed its first quarterly revenue drop in 13 years, on the back of a 26 percent year-on-year fall in smartphone sales in Greater China. In the same month, Chinese regulators apparently blocked access to Apple iTunes Moves and iBooks Store.