Try to Update messages. It worked for me. Or Restart your iPhone and then update iOS from Settings app.

No. You can only build and run iOS apps on Xcode. And Xcode only works properly on 16 GB Macbook Pro. I mean literally you are developing an iOS app with Xcode requires 4 GB RAM and a great cooling system (& also a proper working fan.). Which you can't get in lower macbook models like Macbook Air. The thing is that you have to purchase a Macbook Pro with big screen resolution like minimum of 14 inches to perform better multitasking while testing the app and big storage; as Xcode can roughly use about 80 GB size on Mac and iOS app additional extensions can increase up to 150 GB. My 16 GB Macbook Pro with 16 inches has 512 GB storage; and I'm having storage scarcity. & I can't extend the storage like in non-apple devices. On my Macbook Pro, Xcode takes roughly about 247 GB storage. That's too much. So purchasing a Macbook Pro with 16 GB RAM , 14 inch display, 1 TB storage size can roughly cost $2500. And this is the BASE MODEL for iOS development LOL. Which is very much costly for many people in the world. And if you are planning to buy low level macbook (AIR model) just to build iOS apps. Then you are wasting your money. And with iOS upgrade you will require to but a new Macbook Pro every 4 years As new Xcode drops support for macOS older than 4 years. So again spend at least $2500. Else you can checkout at Apple Developer website : https://developer.apple.com