There have been a handful of cases of iOS malware over the years, but no serious exploit has been widespread. For an exhaustive list see here: https://www.theiphonewiki.com/wiki/Malware_for_iOS
The most wide spread malicious apps are generally apps that access private apis but manage to get through Apple's review process and onto the App Store. They can be far reaching but again they can't breach the sandbox which means the absolute worst thing they do is upload your email address to some server or try to trick you into giving away your password. I still stand by my assertion that the average user doesn't need to worry about malware on iOS.
False, they can breach the sandbox. The sandbox is software and it has exploitable flaws until proven otherwise (which hasn't happened).
Look, like I said in another comment: you'd be fine if you restricted yourself to relative comparisons, but for some reason you have to go too far and make absolute statements of security, statements which can't possibly be true. iOS might be more secure than other OSes, but it's still insecure, and it's dangerous and misleading to say that any users don't need to exercise reasonable caution.
Again, no. Here's another counterexample (which is recent and appears to have been active on the App Store for ~1yr):
https://researchcenter.paloaltonetworks.com/2016/03/acedecei...
"These malicious iOS apps provide a connection to a third party app store controlled by the author for user to download iOS apps or games. It encourages users to input their Apple IDs and passwords for more features, and provided these credentials will be uploaded to AceDeceiver’s C2 server after being encrypted."
That's not state actor stuff.
However, I shouldn't have to keep providing counterexamples to convince you of your absurd claims of practical invulnerability. Apple has not made any kind of security quantum leap: no one has. Apple's systems are vulnerable to the same types of flaws, by the same types of attackers, as any other system in wide use. The main difference is that Apple has restricted their platform to the extent they have an easier time implementing security best practices. iOS is still vulnerable to flaws Apple doesn't know about or hasn't patched, and those flaws can be exploited for as long as Apple remains unaware or fails to act. That's not fundamentally different position from Microsoft, Google, or any other similar company.