Error when converting to Swift 3

[nisreen-nj1700648]

I'm having an error when I have migrated my code from Swift2 to Swift3:
Line: let writeBuffer = UnsafePointer(frame!.bytes+total)
Error : cannot invoke initializer of type UnsafePointer' with an argument list of type '(UnsafeRawPointer)'

Line : let bytes = UnsafePointer((buffer+offset))
Error : 'init' is unabailable : use ' withMemoryRebount(to: capacity:_ )" to temporarily view memory as another layout-compatible type

and many many errors , please i need a solution .
Thanks