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functionswiftreturn
OllieGreen
OllieGreen

Reputation: 1793

Return multiple values from a function in swift

How do I return 3 separate data values of the same type(Int) from a function in swift?

I'm attempting to return the time of day, I need to return the Hour, Minute and Second as separate integers, but all in one go from the same function, is this possible?

I think I just don't understand the syntax for returning multiple values. This is the code I'm using, I'm having trouble with the last(return) line.

Any help would be greatly appreciated!

func getTime() -> Int
{
    let date = NSDate()
    let calendar = NSCalendar.currentCalendar()
    let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute | .CalendarUnitSecond, fromDate: date)
    let hour = components.hour
    let minute = components.minute
    let second = components.second
    let times:String = ("\(hour):\(minute):\(second)")
    return hour, minute, second
}

Upvotes: 179

Views: 125062

Answers (6)

Harjot Singh
Harjot Singh

Reputation: 6927

Update Swift 4.1

Here we create a struct to implement the Tuple usage and validate the OTP text length. That needs to be of 2 fields for this example. 

struct ValidateOTP {
var code: String
var isValid: Bool }

func validateTheOTP() -> ValidateOTP {
    let otpCode = String(format: "%@%@", txtOtpField1.text!, txtOtpField2.text!)
    if otpCode.length < 2 {
        return ValidateOTP(code: otpCode, isValid: false)
    } else {
        return ValidateOTP(code: otpCode, isValid: true)
    }
}

Usage:

let isValidOTP = validateTheOTP()
    if isValidOTP.isValid { print(" valid OTP") } else {   self.alert(msg: "Please fill the valid OTP", buttons: ["Ok"], handler: nil)
    }

Hope it helps!

Thanks

Upvotes: 8

Dhaval Nimavat
Dhaval Nimavat

Reputation: 19

//By : Dhaval Nimavat
    import UIKit

   func weather_diff(country1:String,temp1:Double,country2:String,temp2:Double)->(c1:String,c2:String,diff:Double)
   {
    let c1 = country1
    let c2 = country2
    let diff = temp1 - temp2
    return(c1,c2,diff)
   }

   let result = 
   weather_diff(country1: "India", temp1: 45.5, country2: "Canada", temp2:    18.5)
   print("Weather difference between \(result.c1) and \(result.c2) is \(result.diff)")

Upvotes: 1

Hardik Thakkar
Hardik Thakkar

Reputation: 15951

Swift 3

func getTime() -> (hour: Int, minute: Int,second: Int) {
        let hour = 1
        let minute = 20
        let second = 55
        return (hour, minute, second)
    }

To use :

let(hour, min,sec) = self.getTime()
print(hour,min,sec)

Upvotes: 10

nabu
nabu

Reputation: 572

you should return three different values from this method and get these three in a single variable like this.

func getTime()-> (hour:Int,min:Int,sec:Int){
//your code
return (hour,min,sec)
}

get the value in single variable

let getTime = getTime()

now you can access the hour,min and seconds simply by "." ie.

print("hour:\(getTime.hour) min:\(getTime.min) sec:\(getTime.sec)")

Upvotes: 15

jtianling
jtianling

Reputation: 1997

Also:

func getTime() -> (hour: Int, minute: Int,second: Int) {
    let hour = 1
    let minute = 2
    let second = 3
    return ( hour, minute, second)
}

Then it's invoked as:

let time = getTime()
print("hour: \(time.hour), minute: \(time.minute), second: \(time.second)")

This is the standard way how to use it in the book The Swift Programming Language written by Apple.

or just like:

let time = getTime()
print("hour: \(time.0), minute: \(time.1), second: \(time.2)")

it's the same but less clearly.

Upvotes: 87

David Berry
David Berry

Reputation: 41226

Return a tuple:

func getTime() -> (Int, Int, Int) {
    ...
    return ( hour, minute, second)
}

Then it's invoked as:

let (hour, minute, second) = getTime()

or:

let time = getTime()
println("hour: \(time.0)")

Upvotes: 373

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