This problem occurs when I’m trying to get the value from an UITextField and need this type of conversion! How to convert a string to a float. Προσπάθησα να το πληκτρολογήσω, αλλά ήταν ανεπιτυχές. How to convert String to Double or Float in Swift, 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 need to understand how to convert a String into an Int, Float or Double! Questions: Below is how I would have previously truncated a float to two decimal places NSLog(@" %.02f %.02f %.02f", r, g, b); I checked the docs and the eBook but haven’t been able to figure it out. Θέλω να μετατρέψω -33.861382,151.210316.226.76 σε String. 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 … Floating point precision in Swift String. Float Initialization using Float.init() Swift 4 uses type inference. 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. Πώς να μετατρέψετε την τιμή float σε String; I used to do it like this: […] Swift version: 5.2. 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. Type casting is a way to check the type of an instance, or to treat that instance as a different superclass or subclass from somewhere else in its own class hierarchy.. Any represents to any data type in Swift e.g. Function with in-out parameters. The result of this example will be printed as “Float value = 12.2416”. Type Casting¶. 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: Int, Float, Double,String etc. If you’d like to interpolate a float or a double with a String in Swift, use the %f String format specifier with appropriate number in order to specify floating point precision. So they are constants by default. Swift's string interpolation means you can convert all sorts of data – including integers – to a string in just one line of code: let str1 = "\(myInt)" However, the more common way is just to use the string initializer, like this: let str2 = String(myInt) Based on the value you assign to the variable, compiler deduces the datatype. Type casting in Swift is implemented with the is and as operators. var float = -33.861382 var string = "my float is " + float.description or you could let swift do it for you using: var string = "my float is \(float)" Solution 3: In swift 3 it is simple as given below. Swift … Given a Float or a Double value: var value = 4.53978. How to convert a float to an int; How to convert a String to an Int; How to position views in a grid using LazyVGrid and LazyHGrid; How to make a variadic function; How to use compactMap() to transform an array; About the Swift Knowledge Base. What does that mean? Let's see this in example: How to convert a string to a float. Thanks! In Swift 4 you get native String support for working with different numeric types (Float, Double, and Int). These two operators provide a simple and expressive way to check the type of a value or cast a value to a different type. Paul Hudson @twostraws May 28th 2019. 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