swift double to string

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. How can a GM subtly guide characters into making campaign-specific character choices? Making NSRegularExpression easier to use. Show decimal of a double only when needed, Custom Formatting A String Value For Text Label, Format decimal values with String in Java. Dates, DateComponents and Formatting in Swift Written by Reinder de Vries on March 16 2020 in App Development, iOS, Swift. Für diesen Teil gibt es auch ein Video Tutorial hier auf YouTube. If our double value is within the int range, we can cast it to an int. To convert a string to double, we can use the built-in Double() initializer in Swift. Number Formatter objects can also impose ranges on the numeric values cells can accept . I can't seem to find a way to format a Double limiting the precision to just a couple of positions after the decimal point when presenting that in a label. 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". @IBOutlet weak var numberOfPeopleTextField: UITextField! . Is there any other way to do it? January 2021; December 2020; May 2020; April 2020; March 2020; February 2020; January 2020; December 2019; November 2019; October 2019; September 2019; Recent Posts . In Swift 4 if you like to modify and use a Double in the UI as a textLabel "String" you can add this in the end of your file: extension Double { func roundToInt() -> Int{ return Int(Darwin.round(self)) } } And use it like this if you like to have it in a textlabel: currentTemp.text = "\(weatherData.tempCelsius.roundToInt())" Or print it as an Int: : bad user input). There are multiple types of ranges in Swift you can use. myString.toInt() – convert the string value into int . INSTALL GREPPER FOR CHROME . Link between bottom bracket and rear wheel widths. I'd recommend doing something like . What is the difference between the accent on q and the accent on semicolon? Formating as a string and converting back to double i think will give you the result you want. String to Double. The double value will not be round(), floor() or ceil(). Type Casting¶. These two operators provide a simple and expressive way to check the type of a value or cast a value to a different type. For example, if a number is 45.6789, you might only want to show two digits after the decimal place. Hey guys, I'm having a problem when attempting to display data from an API JSON feed in a tableview. Is this kitchen wall parallel with the joists load-bearing? It’s also type-safe, which means that the Swift programming language will help you avoid mistakes, such as assigning 42 to a variable of type String. Ausserdem lernen wir wie aus Zahlen-Datentypen Strings werden und wie man Strings in Integer- oder Double-Werte umwandelt. Jamie Barton 14,498 Points Jamie Barton . Global Nav Open Menu Global Nav Close Menu; Apple Developer CEO is pressing me regarding decisions made by my former manager whom he fired, Earth and moon gravitational ratios and proportionalities. Swift 2 Update There are new failable initializers that allow you to do this in more idiomatic and safe way (as many answers have noted, NSString's double value is not very safe because it returns 0 for non number values. But in Swift, you have to go through the trouble of initializing an NSRegular Expression object and converting back and forth from String ranges to NSRange values. (These methods don't fail!) It’s a total drag. To concatenate two strings in Swift, use concatenate operator +. cllocationdegrees - swift string to double . But, we can use NSString for that. How can I visit HTTPS websites in old web browsers? 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.. Hi. This happens because we’ve placed a Double into a string, so Swift shows us the full value of that number. String to Double swift 5; Learn how Grepper helps you improve as a Developer! Alternatively, to use printf-like syntax, you can still use NSString: Unsure if there is a pure Swift-way but you can always use NSStrings +stringWithFormat:: site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. How can I print literal curly-brace characters in python string and also use .format on it? let costString = String (9.99) let ageString = String (18) You can find a good discussion about this on this Apple Dev Forum post. Now, that is Ok. Schwierigkeiten mit NSNumberFormatter in Swift für die Währung (6) Ich erstelle eine Budget-App, mit der der Benutzer sein Budget sowie Transaktionen eingeben kann. print(Double(str)) the output is suprising: Optional(8.6999999999999993) also, Float(str) gives: 8.69999981. Swift 3.x. let string = String(CartAmount) convert float to string swift 4, Using Xcode 6.3 you can convert a float to a string using .description. Stack Overflow for Teams is a private, secure spot for you and The Number Formatter class provides flexible options for displaying non-zero fractional parts of numbers. Get code examples like "swift double to string 2 decimals" instantly right from your google search results with the Grepper Chrome Extension. Gleitkommazahl konvertieren. railRatioLabelField.text! It considers also the number format of the current locale. String holding doubles are longer than string holding float. When a type isn't specified, Swift will create a String instance out of a string literal when creating a variable or constant, no matter the length. Now Double is also convertible to String so you can simply use it as you wish: Swift 3 or later we can extend LosslessStringConvertible and make it generic. Ranges in Swift allow us to select parts of Strings, collections, and other types. CartAmount = (response.object(forKey:"amount")as! Swift provides its own versions of all fundamental C and Objective-C types, including Int for integers, Double and Float for floating-point values, Bool for Boolean values, and String for textual data. How to convert double to int in swift So I'm trying to figure out how I can get my program to lose the .0 after an integer when I don't need the any decimal places. @IBOutlet weak va Strings and Characters¶. this worked in Swift 2 , but since converted to Swift 3, I am getting value of 0. var dLati Returns a Boolean value indicating whether this instance should precede or tie positions with the given value in an ascending sort. 1. ios,string,swift,unicode,character. Edit. How to convert double to int in swift So I'm trying to figure out how I can get my program to lose the .0 after an integer when I don't need the any decimal places. double to string swift; drag gesture swiftui; duplicate modifier swiftui error; enum from raw value swift; enum raw value swift; Expression of type 'UIViewController?' Any ideas? Swift 5 Update. A quick fix for it could be: String sValue = (String) String.format("%.2f", oldValue); Double newValue = Double.parseDouble(sValue); @IBOutlet weak var amountOfTurkeyLabel: UILabel! Jamie Barton 14,498 Points September 27, 2014 1:55pm. Significant Digits and Fraction Digits. All Swift Answers. While some of my functions are strings, others are double … Swift also provides powerful versions of the three primary collection types, Array, Set, and Dictionary, as described in Collection Types. Swift 2 Update There are new failable initializers that allow you to do this in more idiomatic and safe way (as many answers have noted, NSString's double value is not very safe because it returns 0 for non number values. The syntax to concatenate two strings is: var str=str1 + str2where str1 and str2 are the two strings that we append. Sep 12, 2016. I can convert the other way but just not back again. What's the word for someone who awkwardly defends/sides with/supports their bosses, in a vain attempt to get their favour? Characters and Strings in Swift. Swift's string interpolation makes it easy to put floating-point numbers into a string, but it lacks the ability to specify precision. Swift also provides powerful versions of the three primary collection types, Array, Set, and Dictionary, as described in Collection Types. Swift's string interpolation makes it easy to put floating-point numbers into a string, but it lacks the ability to specify precision. 8 D major, KV 311'. @IBOutlet weak va Swift 2+ String to Double. Thanks. We have found an alternative but why can we not rely on Double("8.7"). update Xcode 7.1 • Swift 2.1: Now Double is also convertible to String so you can simply use it as you wish: let myDouble = 1.5 let myDoubleString = String(myDouble) // "1.5" Xcode 8.3.2 • Swift 3.1: for fixed number of fraction digits you can also extend Double: = String(format: "%.2f", currentRatio) Example: let myDouble = 3.141 let doubleStr = String(format: "%.2f", myDouble) // "3.14" 1 Answer. Convert string to float: Swift strings doesn’t have any method to convert to float. Convert double to string (Swift) I am trying to convert a double value to a string value? What is the simplest proof that the density of primes goes to zero? They’re the Swift variant of NSRange which we know from Objective-C although they’re not exactly … Double to String. For example, we know that "cat".contains("at")is true but what if we wanted to match any three-letter word that ends in “at”? 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.. Archives. 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. Meaning of KV 311 in 'Sonata No. If the string contains invalid characters or invalid format it returns nil. Double is for 64 bit floating point number and Float is for 32 bit numbers. In this tutorial, we’ll discuss how you can convert date/time to strings, and vice versa, how date/time formatting works, how to calculate … When a type isn't specified, Swift will create a String instance out of a string literal when creating a variable or constant, no matter the length. your coworkers to find and share information. 3. var ganzzahl = 3. var gleitkommazahl = 0.14159. var zahlPi = Double (ganzzahl) + gleitkommazahl . But in Swift, you have to go through the trouble of initializing an NSRegular Expression object and converting back and forth from String ranges to NSRange values. Help identifying pieces in ambiguous wall anchor kit, Plant that transforms into a conscious animal. double to string swift; drag gesture swiftui; duplicate modifier swiftui error; enum from raw value swift; enum raw value swift; Expression of type 'UIViewController?' 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. Characters and Strings in Swift. let x : Double = 2.0 let doubleAsString = NumberFormatter.localizedString(from: (NSNumber(value: x), numberStyle: .decimal) // --> "2" Note: The NSString doubleValue property is not recommended because it returns 0 if the value cannot be converted (i.e. A more generic way to suppress (only) the .0 decimal place in a string representation of a Double value is to use NSNumberFormatter. For something as simple as this example, this is a perfectly good solution. Regular expressions – regexes for short – are designed to let us perform fuzzy searches inside strings. The cast truncates the decimal part, meaning that it cuts it off without doing any rounding. Because multiline string literals use three double quotation marks instead of just one, you can include a double quotation mark (") inside of a multiline string literal without escaping it. The result of this example will be printed as “Float value = 12.2416”. 2. @infix func % (value:Double, format:String) -> String { return NSString(format:format, value) } Which then allows you to use them as: M_PI % "%5.3f" // "3.142" You can define similar operators for all of the numeric types, unfortunately I haven't found a way to do it with generics. A string is a series of characters, such as "hello, world" or "albatross".Swift strings are represented by the String type. The easiest way of working with them is by making use of the range operator. In Swift 2.0 ist der beste Weg, zu vermeiden, wie ein Objective-C-Entwickler zu denken. The syntax to concatenate two strings is: var str=str1 + str2where str1 and str2 are the two strings that we append. We’ll look at more regex syntax in a moment, but first let’s see if we can make NSRegularExpression a little friendlier.. Get a character from string using its index in Swift; How to convert String to Double or Float in Swift; Floating point precision in Swift String . NSString).doubleValue! These two operators provide a simple and expressive way to check the type of a value or cast a value to a different type. This approach is about 10 times as fast as the other approaches we'll look at. 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. This is what regexes are designed to solve, although they use slightly clumsy syntax thanks to their Objective-C r… How to Assign Value of Type Double to Type String? It gives me the error message “double is not convertible to string”. As Swift 4 is type-safe, it performs type-checks when compiling your code and flags any mismatched types as errors. Xcode 11.3 • Swift 5.1 or later Right now our code takes three lines of non-trivial Swift to match a simple string: in swift: (str as NSString).doubleValue returns 8.7. Swift provides its own versions of all fundamental C and Objective-C types, including Int for integers, Double and Float for floating-point values, Bool for Boolean values, and String for textual data. For a fixed number of fraction digits we can extend FloatingPoint protocol: If you need more control over your number format (minimum and maximum fraction digits and rounding mode) you can use NumberFormatter: In addition to @Zaph answer, you can create extension: to make anything a string in swift except maybe enum values simply do what you do in the println() method, SourceKitService Consumes CPU and Grinds Xcode to a Halt, Removing duplicate elements from an array in Swift. ios,string,swift,unicode,character. You can only assign strings to a constant with type String. In Swift 4 you get native String support for working with different numeric types (Float, Double, and Int). Print a conversion table for (un)signed bytes. Let’s go over the different types available in Swift. What are people using old (and expensive) Amigas for today. Precision String Format Specifier In Swift (30 answers) Closed 6 years ago . How to enumerate an enum with String type? You should use the new type initializers to convert between String and numeric types (Double, Float, Int). 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 … This means that the doubleValue of "foo" and "0" are the same.). What we want to happen is to format the number so that two decimal places are visible, and helpfully SwiftUI comes with a specialized string interpolation that lets us do just that. This got changed in Swift 1.2 so that you need to explicitly cast between these data types, and this remains the same in Swift today. How to get the height of a UILabel in Swift? FYI, your link appears to have experienced linkrot. Swift, I have a option string and want to convert that to double. Here’s the good news: You don’t need NSRegular Expression to use regular expressions in Swift. How do you work with date and time in Swift? To concatenate two strings in Swift, use concatenate operator +. Use a format string to round up to two decimal places and convert the double to a String: let currentRatio = Double (rxCurrentTextField.text!)! The result of this example will be printed as “Float value = 12.2416”. This happens because we’ve placed a Double into a string, so Swift shows us the full value of that number. / Double (txCurrentTextField.text!)! Can Pluto be seen with the naked eye from Neptune when Pluto and Neptune are closest? Maybe I'm missing something major, but I couldn't find anything in the official documentation. Also, how should I then convert “8.7” to 8.7 as Double (or Float)? The contents of a String can be accessed in various ways, including as a collection of Character values.. Swift’s String and Character types provide a fast, Unicode-compliant way to work with text in your code. 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. Sponsor Hacking with Swift and reach the world's largest Swift community! Once it's an int, then we can then pass it to the valueOf method on the String class: String truncated = String.valueOf((int) doubleValue); The Double() initializer takes the string as an input and returns the double instance. Type casting in Swift is implemented with the is and as operators. Join Stack Overflow to learn, share knowledge, and build your career. In Swift 4 if you like to modify and use a Double in the UI as a textLabel "String" you can add this in the end of your file: extension Double { func roundToInt() -> Int{ return Int(Darwin.round(self)) } } And use it like this if you like to have it in a textlabel: currentTemp.text = "\(weatherData.tempCelsius.roundToInt())" Or print it as an Int: How to implement conditional string formatting? Swift Jan 14, 2020 Jan 15, 2020 • 4 min read Ranges in Swift explained with code examples. I can't seem to find a way to format a Double limiting the precision to just a couple of positions after the decimal point when presenting that in a label. Edit. But my question, still, does not get a complete answer. What does the ^ character mean in sequences like ^X^I? Convert Double, Float, or Int to String You can do the reverse conversion from a Double to a String by using one of the many String initializers. Type casting in Swift is implemented with the is and as operators. You can request currency and it will set up the string to follow the user's localization settings, which is useful. You can also omit the format property if no formatting is needed. myString.toInt() – convert the string value into int . let double = 1.5 let string = double.description update Xcode 7.1 • Swift 2.1: Now Double is also convertible to String so you can simply use it as you wish: let double = 1.5 let doubleString = String(double) // "1.5" Swift 3 or later we can extend LosslessStringConvertible and make it generic. Ich muss dem Benutzer erlauben, sowohl Pence als auch Pfund aus separaten Textfeldern einzugeben, und sie müssen zusammen mit Währungssymbolen formatiert werden. There's no way to do this using String interpolation. How can a monster infested dungeon keep out hazardous gases? Learning by Sharing Swift Programing and more …, Before I updated xCode 6, I had no problems casting a double to a string but now it gives me an error. It’s a total drag. How was the sound for the Horn in Helms Deep created? Get code examples like "swift double to string 2 decimals" instantly right from your google search results with the Grepper Chrome Extension. Sie sollten also "keinen String in einen Double konvertieren", aber Sie sollten "Double aus einem String … Home » Blog » App Development » Dates, DateComponents and Formatting in Swift. What we want to happen is to format the number so that two decimal places are visible, and helpfully SwiftUI comes with a specialized string interpolation that lets us do just that. Now Double is also convertible to String so you can simply use it as you wish: let double = 1.5 let doubleString = String(double) // "1.5" Swift 3 or later we can extend LosslessStringConvertible and make it … This means that the doubleValue of "foo" and "0" are the same.). For example, if a number is 45.6789, you might only want to show two digits after the decimal place. Here’s the good news: You don’t need NSRegular Expression to use regular expressions in Swift. What is a "Major Component Failure" referred to in news reports about the unsuccessful Space Launch System core stage test firing? Swift 3 & 4. Swift 3.x. @IBOutlet weak var numberOfPeopleTextField: UITextField! 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". Now, that is Ok. Do the benefits of the Slasher Feat work against swarms? You may use String not NSString : let str = String(format: "%.2f", 1.23), String formatting of a Double [duplicate], Precision String Format Specifier In Swift, Swift: Trunc a floating number to show it in a label, How to use println in Swift to format number, how to send user longitude and latitude coordinates through sms text, String formatting: % vs. .format vs. string literal. Any thoughts or reasons on this guys? To include the text """ in a multiline string, escape at least one of the quotation marks. which will have the correct value or nil if the String was not a number. @IBOutlet weak var amountOfTurkeyLabel: UILabel! Let’s start with a couple of easy examples for folks who haven’t used regular expressions before. Any references to this would be appreciated. This got changed in Swift 1.2 so that you need to explicitly cast between these data types, and this remains the same in Swift today. It’ll return an Optional type (Double?) swift: issue in converting string to ... Also, how should I then convert "8.7" to 8.7 as Double (or Float)? As an alternative to using a NumberFormatter, If you want to force a US-formatted dollars and cents string you can format it this way: let amount: Double = 123.45 let amountString = String(format: "$%.02f", amount) in swift: (str as NSString).doubleValue returns 8.7. Double型などの浮動小数点数値と文字列の相互変換は、String型では定義されていないため、NSString型を用いる必要がある String --> Double (Float,Int,Int64,etc) swift static func minimum (Double, Double) -> Double Returns the lesser of the two given values. It is not casting, it is creating a string from a value with a format. rev 2021.1.18.38333, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. swift double to string locale . Swift 4 is a type-safe language which means if a part of your code expects a String, you can't pass it an Int by mistake. In this post, we will learn how to convert a string to float and double in Swift. Swift is a strong-typed programming language, which means that every variable needs to have a type, and that type cannot be changed after declaring it. Working with JSON in Swift If your app communicates with a web application, information returned from the server is often formatted as JSON.You can use the Foundation framework’s JSONSerialization class to convert JSON into Swift data types like Dictionary, Array, String, Number, and Bool.However, because you can’t be sure of the structure or values of JSON your app … You can use NSNumberFormatter or NSDateFormatter to format the output. Swift Objective-C API Changes : None; Class ... floats and doubles can be formatted to a specified decimal position. Type Casting¶.

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