[Solved] Replace occurrences in String

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Create an array with the new strings. Find the range of first matching substring “black” in the string using range(of:). And replace with the new string in the range using replaceSubrange(_:with:) method.
Then continue the loop till last element of the array.

var mString = "my car is black, my phone is black"
["blue","red"].forEach {
    if let range = mString.range(of: "black") {
        mString.replaceSubrange(range, with: $0)
    }
}
print(mString)

my car is blue, my phone is red

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solved Replace occurrences in String