Is KI ionic covalent or metallic?

KI ( potassium iodide) is an ionically bonded molecule.

The metal potassium (K) ; kalium) ionises to form the potassium cation K^(+)

The iodine atom has electron affinity to accept one electron into its outer energy shell to complete its octet, to form the iodide anion I^(-) .Since both these ions have a charge of '1' , but of opposite charge, they are attracted like the north and south poles of a magnet., to form the molecule potassium iodide (KI).

Covalency and metallic bonding do not come into consideration.

Hence

K = K^(+) + e^(-)

e^(-) + I = I^(-)

'Adding'

K + I = K^(+) + I^(-) = K^(+)I^(-). shortened to KI