findSumOddNumbersRange()

Step 1: Defining the Function

Firstly, we will define our function with two parameters: the starting point and the ending point of the range. We'll name this function sumOfOddNumbersInRange following Swift's function naming conventions.

func sumOfOddNumbersInRange (start: Int, end: Int) {

}

Step 2: Initialize a Sum Variable

Next, we will initialize a variable within our function to hold the total sum. We'll initially set it to 0.

func sumOfOddNumbersInRange (start: Int, end: Int) {
    var total = 0
}

Step 3: Create a Loop

We then create a loop to iterate over the range from the start to the end. In Swift, we can use a for..in loop to accomplish this.

func sumOfOddNumbersInRange (start: Int, end: Int) {
    var total = 0
    for number in start...end {
    }
}

Step 4: Check if the Number is Odd

Inside the loop, we need to check if the number is odd. In Swift, we can check if a number is odd by using the modulo operator %. If a number modulo 2 equals 1, then it is odd.

func sumOfOddNumbersInRange (start: Int, end: Int) {
    var total = 0
    for number in start...end {
        if number % 2 == 1 {
    }
}

Step 5: Updating the Sum and Complete the Function

Finally, we update total by adding the current number if it's odd and return total when all numbers in the range have been checked. This will be our final function:

func sumOfOddNumbersInRange (start: Int, end: Int) -> Int {
    var total = 0
    for number in start...end {
        if number % 2 == 1 {
            total += number
        }
    }
    return total
}

The function now takes in a range and returns the sum of all odd numbers in the range. The Swift language's strong type system, concise syntax and for-in loop construct make tasks like this straightforward.