In Swift 4 you get native String support for working with different numeric types (Float, Double, and Int). What does that mean? I found Paul Hegarty to be a FANTASTIC instructor, and I would highly recommend the class to anyone starting out as an iOS developer in Swift!! Posted by: admin November 23, 2017 Leave a comment. It is best to create a NSNumberFormatter to convert a string to float.The accepted answer shows a more up to date way of doingThis 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 timeUsing 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.
The result of this example will be printed as “Float value = 12.2416”.As expected, in order to convert the String to a Double, substitute the When would you use Double over Float data type?
I have two UITextfields which are declared as follows: @IBOutlet var wage: UITextField @IBOutlet var hour: UITextField When the … Mike Chamberlain. Swift version: 5.2.
In Swift 4 you get native String support for working with different numeric types (Float, Double, and Int). Floating point precision in Swift String. Swift also provides powerful versions of the three primary collection types, Array, Set, and Dictionary, as described in Collection Types.
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: However, if I used the .doubleValue instead, I would get the 1.1 that I wanted.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. Swift Int to String. It means that if you initialize a variable with float value during declaration, you can skip telling the compiler that the variable is of Float type. Since If you’re sure the text will be an integer, you can do something like this (note that 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):By the way, I took Stanford’s CS193p class using iTunes University when it was still teaching Objective-C. I did not want to “cross the bridge”, as it has been removed from Xcode 6 beta 5 anyway, quick and dirty:You have two options which are quite similar (by the approach and result):Note that this will only work if your text actually contains a number. Given a Float or a Double value: var value = 4.53978.
It all comes down to how big of a number you’re expecting the string to hold. Floating point precision in Swift String.
Based on the value you assign to the variable, compiler deduces the datatype. For example, if a number is 45.6789, you might only want to show two digits after the decimal place. 0 Float(Wage.text) ?? For example, if you are receiving float data in string format from the server and if you want to do any arithmetic operations on them, you need to convert them to float first.. For example, let’s take a look at the below program : 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.When the user presses a UIButton I want to calculate the wages the user earns, but I can’t, as I need to convert them to floats first, before I can use them.I know how to convert them to an integer by doing this:However, I have no idea how to convert them to floats.This is a good implementation since it can handle actual floats (input with Also, variables and constants should start with a lower case (including Because in some parts of the world, for example, a comma is used instead of a decimal.