iOS devices have gotten a lot better at recording video over the years. You can always connect a professional microphone to improve the audio captured. The Rode i-XLR is a handy gadget that lets you connect XLR microphones to your iPhone or iPad. It is compatible with dynamic and self-powered microphones.
The i-XLR has a 3.5mm headphone jack and 3m Lightning cable. It combines with the RODE Reporter app to record in up to 24-bit/96kHz resolution. The device is compatible with shotgun, interview, broadcast, lavalier, and other microphones.[where to get it]