Which iPhone bitcoin wallets let you scan a watch only address and sweep addresses? Currently Mycelium on Android lets you create watch only addresses by scanning the public key QR code and import paper wallet private keys. But the iPhone  iOS version doesn't. What apps are there for iOS that lets you do watch only and import from a paper wallet?
There are other wallets on iOS but these additionally support xpub import, so you can generate addresses for recieving, without private keys:


BitWallet
ArcBit