ConvertToUpperCase()

Step 1: Create a Swift function

First of all, you'll need to define a function in Swift. We're going to call it convertToUpperCase that will take a string as an input.

func convertToUpperCase(input: String) {

}

Step 2: Add functionality to convert characters

Inside the brackets, add a line of code to transform the string to all uppercase letters. Swift has a built-in method called uppercased() which converts all the characters in a string to uppercase.

func convertToUpperCase(input: String) {
    let uppercasedString = input.uppercased()
}

Step 3: Returning the Result

We need the function to return the converted string. So, let's modify our function definition to specify that it returns a string, and add a return statement.

func convertToUpperCase(input: String) -> String {
    let uppercasedString = input.uppercased()
    return uppercasedString
}

Step 4: Function Usage

Now we can call our function and pass it a string, the function will return the uppercased string.

let result = convertToUpperCase(input: "hello")

Conclusion

This is the final implementation of the function. This function takes a string, converts it to uppercase and returns the uppercased string.

func convertToUpperCase(input: String) -> String {
    let uppercasedString = input.uppercased()
    return uppercasedString
}

In Swift, transforming a string to uppercase is quite straightforward, and all thanks to its built-in uppercased() method.

To use the function, you simply call convertToUpperCase(input: stringToConvert), assign its return value to a variable, and then you can use that variable in your code.