I’m trying to convert numbers taken from a UITextField, which I presume, are actually Strings, and convert them to Float, so I can multiply them. Menu Convert a String into an Int, Float, Boolean, and Data in Swift 11 November 2020 on Swift. 0 which will return 0 if it is not a valid Float. floatValue is a method of NSString. There are several ways to convert between a string and a Float, but the easiest way is to use NSString as an intermediate because that comes with several helpers built right in: let myString = "556" let myFloat = (myString as NSString).floatValue. Pulp Fiction is copyright © 1994 Miramax Films. More clear than the below solution which just returns 0. Any way to replace characters on Swift String? and will also help prevent the user from copying text into your input field (12p.34, or even 12.12.41). Converting a String to a Double or Float can be easily achieved by using the if let statement in Swift. Update Policy             Function with in-out parameters When you define the function parameter, the function parameters cannot be modified inside the body. Now with Swift 2.0 you can just use Float(Wage.text) which returns a Float? How to get overall CPU usage in iOS Swift 4.x, Get CPU usage percentage of single iOS App in Swift 4.x, Get the currently connected WiFi informations in Swift 4.x, Check connection from iOS device to server by Swift 4.X, Get the server’s current time with Swift 4.X URLSession, Write a log text file on Disk use TextOutputStream in Swift 4 iOS, How to change Status Bar text color in iOS. Converting a String to a Double or Float can be easily achieved by using the if let statement in Swift. Do Swift-based applications work on OS X 10.9/iOS 7 and lower? Using the accepted solution, I was finding that my “1.1” (when using the .floatValue conversion) would get converted to 1.10000002384186, which was not what I wanted. Swift how to sort array of custom objects by property value. It is best to create a NSNumberFormatter to convert a string to float. type. I know how to convert them to an integer by doing this: However, I have no idea how to convert them to floats. How do I see which version of Swift I’m using? func floatValueFromData(data: NSData) -> Float { return unsafeBitCast(UInt32(bigEndian: UnsafePointer(data.bytes).memory), Float.self) } Example: How to iterate a loop with index and element in Swift, iOS 8 UITableView separator inset 0 not working. About             What does an exclamation mark mean in the Swift language? Is it possible to remove the delay of UIButton’s highlighted state inside a UIScrollView? If you want a 0 value for an invalid Float for some reason you can use Float(Wage.text) ?? Since bridgeToObjectiveC() is no longer available with Xcode 6 Beta 5, you can use the as operator to cast your Swift String to NSString: (device.systemVersion as NSString).floatValue Learning by Sharing Swift Programing and more …. There are several ways to convert between a string and a Float, but the easiest way is to use NSString as an intermediate because that comes with several helpers built right in: Sponsor Hacking with Swift and reach the world's largest Swift community! It is best to create a NSNumberFormatter to convert a string to float. Convert String to Float Swift. Detect if Swift app is being run from Xcode. let numberFormatter = NSNumberFormatter() numberFormatter.numberStyle = NSNumberFormatterStyle.DecimalStyle. How would I create a UIAlertView in Swift? Refund Policy             How do I check if a string contains another string in Swift? type. These functions are defined in the string header file. Grab the String to Double Cheatsheet and Swift Playground mentioned below in the toolkit for a quick reference that you can use as you work on your apps. Here's an example using basic string interpolation: let angle = 45.6789 let raw = "Angle: \(angle)" That will make the raw value equal to "Angle: 45.6789". If they do add it later, then all you need to do to modify your code is remove the extension and everything will work seamlessly, since you will already be calling .floatValue! In Swift, what’s the cleanest way to get the last two items in an Array? Hacking with Swift is ©2020 Hudson Heavy Industries. Convert Swift String to Double Use Double, Float, CGFloat to convert floating-point values (real numbers). For example, if a number is 45.6789, you might only want to show two digits after the decimal place. Using Xcode 6.3 you can convert a float to a string using .description. How to enumerate an enum with String type? Paul Hudson @twostraws May 28th 2019. In Swift 2 that would be. Working with String is a common task in macOS and iOS apps. Also, variables and constants should start with a lower case (including IBOutlets). Int, Float, Double,String etc. How to check if an element is in an array, Shall we always use [unowned self] inside closure in Swift, How to add constraints programmatically using Swift, How to hide UINavigationBar 1px bottom line. C++ string to float and double Conversion. Code of Conduct, Hacking with Swift is sponsored by Gold Supporters on Patreon – click here to find out more. You can use Optional Float, stick a ! Why create “Implicitly Unwrapped Optionals”, since that implies you know there’s a value? 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") } How do I call Objective-C code from Swift? How to convert dates and times to a string using DateFormatter, How to handle unknown properties and methods using @dynamicMemberLookup, Click here to visit the Hacking with Swift store >>. std::stof() - convert string to float std::stod() - convert string to double std::stold() - convert string to long double. The easiest way to convert a string to a floating-point number is by using these C++11 functions:. Get nth character of a string in Swift programming language. Old Solution. When Swift originally launched, NSString (older iOS strings) and native Swift strings were completely interchangeable, as were NSArray and Swift arrays, plus NSDictionary and Swift dictionaries. This is how Paul Hegarty has shown on Stanford’s CS193p class in 2015: You can even create a computed property for not having to do that every time. So for example, instead of using the accepted solution, I used this instead: In my case I did not need double-precision, but using the .floatValue was not giving me the proper result. The use of Swift 3 @objc inference in Swift 4 mode is deprecated? However, if I used the .doubleValue instead, I would get the 1.1 that I wanted. Now with Swift 2.0 you can just use Float(Wage.text) which returns a Float? Convert a String into an Int, Int8, Int16, Int32, and Int64 To get the number back from the data, you have to read it into an UInt32 first, convert from big-endian to host byteorder, and then cast the result to a Float. Nsnumberformatter ( ) numberFormatter.numberStyle = NSNumberFormatterStyle.DecimalStyle a string into an Int, Float, Boolean, and 5 being from., variables and constants should start with a lower case ( including IBOutlets ) items an. Swift how to convert a string to a Double or Float in strings. 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