BitcoinSPV is the first full-stack Bitcoin library for iOS, completely written in native Objective-C.
It provides the basic protocol data structures, essential client functionality and some modern features like BIP37 Bloom filters for efficient SPV and BIP32 hierarchical deterministic wallets.
I made BitcoinSPV open source in the hope to increase Bitcoin adoption on mobile devices. If you’ve never heard of Bitcoin, you should by now learn about it.