Back when I had an iPhone I used to use the Blockchain wallet. It worked well for me and to this day I still haven't found any cons about it.
Whatever phone OS do i have on my mobile either iOS or Android i always still choose blockchain wallet and there are really no issues for me same as yours i dont found any issues on me until this time.Talking about its interface its user-friendly and its easy to understand,i know the risk on using web wallets but im confident on using it because on making online transactions fast and smooth.