Convert optional string to double in Swift 3

Convert optional string to double in Swift 3

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I have a option string and want to convert that to double. this worked in Swift 2 , but since converted to Swift 3, I am getting value of 0.

var dLati = 0.0
dLati = (latitude as NSString).doubleValue

I have check and latitude has a optional string value of something like -80.234543218675654 , but dLati value is 0 *************** ok, new update for clarity ***************** I have a viewcontroller which i have a button in it, and when the button is touched, it will call another viewcontroller and pass a few values to it here is the code for the first viewcontroller

var currentLatitude: String? = ""
var currentLongitude: String? = ""
var deviceName = ""
var address = ""
// somewhere in the code, currentLatitude and currentLongitude are get set  
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "map" {
       let destViewController : MapViewController = segue.destination as! MapViewController
       print(currentLongitude!)  // Print display: Optional(-80.192279355363768)
       print(currentLatitude!) // Print display: Optional(25.55692663937162) 
       destViewController.longitude = currentLongitude!
       destViewController.latitude = currentLatitude!
       destViewController.deviceName = deviceName
       destViewController.address = address
    }
}

Here is the code for the second view controller called MapViewController

   var longitude: String? = " "
   var latitude: String? = ""
   .
   .
   override func viewDidLoad() {
       if let lat = latitude {
          print(lat) // Print display: optiona(25.55692663937162)
          dLati = (lat as NSString).doubleValue
          print(dLati)  // Print display: 0.0
       }
       .
       .
   }

Thanks Borna


A safe way to achieve this without needing to use Foundation types is using Double's initializer:

if let lat = latitude, let doubleLat = Double(lat) {
  print(doubleLat)  // doubleLat is of type Double now
}

How to Convert a String to Double and Float types using Swift 4 , In this String to Double Guide, you'll learn how to convert different types of String Int? ). How do you use the value if it's wrapped in an optional type? let yearsAgo: Int = 10 let outputString = "I had \(3) pairs of running shoes  How to convert String to Double or Float in Swift. Converting a String to a Double or Float can be easily achieved by using the if let statement in Swift. Take a look at the following example: var string = "12.2416" if let floatValue = Float (string) { print ("Float value = \(floatValue) ") } else { print ("String does not contain Float") }


Unwrap the latitude value safely and then use

var dLati = 0.0

if let lat = latitude {
    dLati = (lat as NSString).doubleValue
}

Convert optional string to double in Swift 3, I have a option string and want to convert that to double. this worked in Swift 2 , but since converted to Swift 3, I am getting value of 0. var dLati = 0.0 dLati  Swift 2+ String to Double. You should use the new type initializers to convert between String and numeric types (Double, Float, Int). It’ll return an Optional type (Double?) which will have the correct value or nil if the String was not a number.


let dLati = Double(latitude ?? "") ?? 0.0

How to convert a string to a double, Was this page useful? Let us know! 1, 2, 3, 4, 5. Average rating: 4.7/  Convert Swift String to Double. Use Double, Float, CGFloat to convert floating-point values (real numbers). let lessPrecisePI = Float("3.14") let morePrecisePI = Double("3.1415926536") let width = CGFloat(Double("200.0")!) Convert Swift String to Int. Use Int and the variants like Int32, UInt64, etc. to convert integer values.


This code works fine.

var dLati = 0.0
let latitude: String? = "-80.234543218675654"
if let strLat = latitude {
    dLati = Double(strLat)!
}

🧑 ‍🤝‍🧑 Convert optional string to double in Swift 3, I have a option string and want to convert that to double. this worked in Swift 2 , but since converted to Swift 3, I am getting value of 0. var dLati  Swift strings don't have a built-in way to convert to a Double, but their NSString counterparts do. To convert between strings and doubles, just do this: let myString = "556" let myFloat = (myString as NSString).doubleValue SPONSORED Building in-app subscriptions are hard.


When you get a string with double value something like this

"Optional(12.34567)"

You can use a Regex which takes out the double value from the string. This is the example code for a Regex if the string is "Optional(12.34567)":

let doubleLatitude = location.latitude?.replacingOccurrences(of: "[^\\.\\d+]", with: "", options: [.regularExpression])

Check if string is a valid double value in Swift, A safe way to achieve this without using Foundation types is to use a dual initializer: if let lat = latitude, let doubleLat = Double(lat) { print(doubleLat) // doubleLat  Swift is telling me "Value of type String has no member toint" – TahoeWolverine Jan 31 at 20:59 @TahoeWolverine toInt() is no longer available. – Dharmesh Kheni Feb 1 at 13:57


Swift Convert String to Int Example, Convert optional string to double in Swift 3, Swift strings don't have a built-in way to convert to a Double , but their NSString counterparts do. To convert between  Here is a Swift 3 adaptation of Paul Hegarty's solution from rdprado's answer, with some checking for optionals added to it (returning 0.0 if any part of the process fails):


Convert String To Int (And Back) – LearnAppMaking, Handle invalid string data and optionals. Convert. No transformation is quite Swift program that converts Int to String // This is an Int value. let number With optionals and optional binding, we handle these conversions with grace in Swift 3. In Swift we often use optionals. Here we convert an optional String into a String. And then we convert the String back into an optional one. Syntax: We use the exclamation mark to access the value in a non-nil optional. We use a question mark to specify an optional container. Optionals


Optionals In Swift: The Ultimate Guide – LearnAppMaking, How do you convert from int to string, or from string to int, in Swift? In this article, I'​ll The ageInt constant in the example above is an optional. let apples = 3 let oranges = 2 print("We have \(apples * oranges) pieces of fruit. things. append ({ (name: String) -> String in "Hello, \ (name)" }) The things array contains two Int values, two Double values, a String value, a tuple of type (Double, Double), the movie “Ghostbusters”, and a closure expression that takes a String value and returns another String value.