Apart from Bluewallet which I believe is an open source bitcoin wallet on iOS, there is Bither, BitPay Wallet and Edge Wallet. Edge also supports other crypto assets besides bitcoin
This wallets do not have some of the features that Bluewallet has. I can not even recommend these wallets. Almost all bitcoin wallets that have excellent features are not supporting altcoins.
So true. I agree.
I also have no intention of recommending any of the wallets I mentioned above and I myself have never used them other than Electrum on desktop and BlueWallet on mobile. Previously I used Trus Wallet to store some coins, but it's probably the worst wallet I've ever used to store some coins.
BlueWallet is specifically for macOS and iOS users although it also supports Android. For me bluewallet is very trustworthy.