Shares of Apple fell 1.2% in after-hours trading, while Texas Instruments and Broadcom were both down about 1%.
Apple last year introduced its iPhone 12, which featured a new look and its first devices with 5G connectivity. This year, analyst expect modest hardware upgrades and a deeper focus on 5G.
The new line of smartphones are expected to expand the Portrait mode feature to video and also have higher-quality video recording format, Bloomberg reports.
The violence broke out as about 2,000 workers from the night shift were leaving the building.
Taipei-listed Pegatron admits that some students labourers at factories in Shanghai and Kunshan were made to work in conditions not compliant with agreed terms.