Calling functions in Swift

Question

Ok, so I'm good with php and vba, but now I'm trying to learn iOS apps. Im attempting to write one that calculates the shift schedule for a rotating shift. Ive got the function down... or so i think. Im trying to test it, but how do i call it?

shiftCalc.crew("days","2015-09-13");

here is my code..

class shiftCalc
{
var startDate: String = "2002-11-12";
var cycleOrder: String = "45321";
var tweekLength: Int = 4;
var tweekStart: Int = 27;
var midsStart: Int = 9;
var swingsStart: Int = 0;
var daysStart: Int = 18;
let dateFormatter = NSDateFormatter();

// Returns what crew is on shift for given shift and date
func crew(shift: String, strInputDate: String) -> String
{
    var intOffset: Int;
    var intShiftStart: Int;
    var intCrewWeek: Int;
    var crew: String;
    dateFormatter.dateFormat = "yyyy-MM-dd";
    let varDate = dateFormatter.dateFromString(startDate);
    let inputDate = dateFormatter.dateFromString(strInputDate)

    if(inputDate!.compare(varDate!) == NSComparisonResult.OrderedDescending)
    {
        NSLog("Date Before Shift Schedules Implemented");
        // Exit Script
    }
    else
    {
        //Get number of days between input date and start date
        intOffset = daysBetweenDate(varDate!, endDate: inputDate!);
    }
    switch shift
    {
    case "swings":
        intShiftStart = swingsStart;
    case "mids":
        intShiftStart = midsStart;
    case "days":
        intShiftStart = daysStart;
    case "tweek":
        intShiftStart = tweekStart;
    default:
        // Not a valid shift
        return "";
    }
    intOffset = daysBetweenDate(varDate!, endDate: inputDate!);
    intCrewWeek = 1 + (((intOffset + 35 - intShiftStart) % 35)/7);
    crew = String(Array(cycleOrder.characters)[intCrewWeek]);
    return crew;
}
func daysBetweenDate(startDate: NSDate, endDate: NSDate) -> Int
{
    let calendar = NSCalendar.currentCalendar()
    let components = calendar.components([.Day], fromDate: startDate, toDate: endDate, options: []);
    return components.day
}
}

But Xcode is telling me i am passing too many parameters. "Extra argument in call"

So please critique me, i am learning all of this so what did i do wrong?

I would probably not name the variable the same name as the function: "crew". MirekE's answer is how you call the function. — rholmes, Sep 13 '15 at 16:26
That makes sense. I fixed that. I had that originally from when i tried to write this using vba style. — brandenwagner, Sep 13 '15 at 16:30

score 0 · Accepted Answer · answered Sep 13 '15 at 16:26

0

Class names should start with uppercase letters. So once you fix it, your code could look like this:

let shiftCalc = ShiftCalc()
shiftCalc.crew("days", strInputDate: "2015-09-13")

answered Sep 13 '15 at 16:26

MirekE

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This fixed it. Thank you, i know understand how to call it properly in swift. So when calling a function with multiple inputs do i always need to specify the variable name in the call? strInputDate:? – brandenwagner Sep 13 '15 at 16:31

score 0 · Answer 2 · answered Sep 13 '15 at 16:28

If you want to call the function on the class you have to declare the function as class function

class func crew(shift: String, strInputDate: String) -> String

In Swift you have always pass the second and subsequent parameter names inside a class.

shiftCalc.crew("days", strInputDate:"2015-09-13")

And you don't need any semicolon

Calling functions in Swift

2 Answers2