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Swift's string interpolation makes it easy to put floating-point numbers into a string, but it lacks the ability to specify precision. In Swift 4 you get native String support for working with different numeric types (Float, Double, and Int). Questions: Looking for a way to use Swift extensions in a separate file or an alternative solution. Convert String to float in Apple's Swift .
Here's an example using basic string interpolation: let angle = 45.6789 let raw = …
The BUT, the same thing can happen if you're trying to convert currency numbers ($3.49), or even formatted numbers with grouping separators (4,300.99).
Paul Hudson @twostraws May 28th 2019. 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. 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.
1.通常情况下 1.1 Int转 String; let intValue1 = 2 let strValue1 = String(intValue1) 1.2 String 转 Int. Convertir String pour flotter dans Swift d'Apple (10) Swift 2.0+ Maintenant, avec Swift 2.0, vous pouvez simplement utiliser Float(Wage.text) qui renvoie un Float? Convert string to float in python : Sometimes, we need to convert a string to a float value. Based on the value … Converting a String to a Double or Float can be easily achieved by using the If the String contains a valid floating point value, then Swift will assign it to the floatValue constant which will be available within the if let scope.
Mike Chamberlain. But that's not the end of the story, you may need to use the NumberFormatter (NSNumberFormatter) class to convert formatted numbers (1,000,000) or currency ($3.50) in your Swift code.But that's not everything you need to know, because this conversion process can fail, and that gives you an optional How do you use the value if it's wrapped in an optional type?Not everyone learns the same way, get the String Conversion Toolkit so that you can follow along with this guide.There's no good number representation for a word like "alphabet", and the result becomes To use the converted numbers you'll need to unwrap them—I recommend using the You will need to unwrap the optional to get the value.
share | improve this question | follow | edited Jul 18 '15 at 10:40. 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".
What does that mean? let strValue2 = "123" let intValue2 = Int(strValue2) 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. Swift's string interpolation makes it easy to put floating-point numbers into a string, but it lacks the ability to specify precision. Double represents a 64-bit floating point number and Float represents 32-bit number so if you’re expecting huge numbers, use Double.If you’d like to learn how to round the value of floating point number to a desired decimal place and convert it to string, then check out our What does that mean?
0 qui retournera 0 si … var string = "12.2416" if let floatValue = Float (string) { print ("Float value = \(floatValue) ") } else { print ("String does not contain Float") } If the String contains a valid floating point value, then Swift will assign it to the floatValue constant which will be available within the if let scope. I have two UITextfields which are declared as follows: @IBOutlet var wage: UITextField @IBOutlet var hour: UITextField When the …