swift double to 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 … 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. How can a monster infested dungeon keep out hazardous gases? Maybe I'm missing something major, but I couldn't find anything in the official documentation. 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. Type Casting¶. The syntax to concatenate two strings is: var str=str1 + str2where str1 and str2 are the two strings that we append. 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: We have found an alternative but why can we not rely on Double("8.7"). You can only assign strings to a constant with type String. Here’s the good news: You don’t need NSRegular Expression to use regular expressions in Swift. your coworkers to find and share information. 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. Meaning of KV 311 in 'Sonata No. It gives me the error message “double is not convertible to string”. All Swift Answers. You can also omit the format property if no formatting is needed. 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. Archives. Let’s start with a couple of easy examples for folks who haven’t used regular expressions before. What is a "Major Component Failure" referred to in news reports about the unsuccessful Space Launch System core stage test firing? Schwierigkeiten mit NSNumberFormatter in Swift für die Währung (6) Ich erstelle eine Budget-App, mit der der Benutzer sein Budget sowie Transaktionen eingeben kann. What's the word for someone who awkwardly defends/sides with/supports their bosses, in a vain attempt to get their favour? 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. myString.toInt() – convert the string value into int . The easiest way of working with them is by making use of the range operator. What is the difference between the accent on q and the accent on semicolon? 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.. 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". Let’s go over the different types available in Swift. let costString = String (9.99) let ageString = String (18) To concatenate two strings in Swift, use concatenate operator +. To concatenate two strings in Swift, use concatenate operator +. 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 … Swift's string interpolation makes it easy to put floating-point numbers into a string, but it lacks the ability to specify precision. Ranges in Swift allow us to select parts of Strings, collections, and other types. How to Assign Value of Type Double to Type String? 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. Swift Objective-C API Changes : None; Class ... floats and doubles can be formatted to a specified decimal position. Join Stack Overflow to learn, share knowledge, and build your career. What are people using old (and expensive) Amigas for today. 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. 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. Swift 3 & 4. How do you work with date and time in Swift? Any ideas? 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". You can find a good discussion about this on this Apple Dev Forum post. @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. Convert double to string (Swift) I am trying to convert a double value to a string value? print(Double(str)) the output is suprising: Optional(8.6999999999999993) also, Float(str) gives: 8.69999981. Jamie Barton 14,498 Points Jamie Barton . But, we can use NSString for that. For example, if a number is 45.6789, you might only want to show two digits after the decimal place. Significant Digits and Fraction Digits. Jamie Barton 14,498 Points September 27, 2014 1:55pm. Swift 3.x. Now, that is Ok. 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. String to Double. Sep 12, 2016. This happens because we’ve placed a Double into a string, so Swift shows us the full value of that number. As Swift 4 is type-safe, it performs type-checks when compiling your code and flags any mismatched types as errors. NSString).doubleValue! It’ll return an Optional type (Double?) For example, if a number is 45.6789, you might only want to show two digits after the decimal place. Swift, I have a option string and want to convert that to double. Dates, DateComponents and Formatting in Swift Written by Reinder de Vries on March 16 2020 in App Development, iOS, Swift. This is what regexes are designed to solve, although they use slightly clumsy syntax thanks to their Objective-C r… which will have the correct value or nil if the String was not a number. If the string contains invalid characters or invalid format it returns nil. Here’s the good news: You don’t need NSRegular Expression to use regular expressions in Swift. 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: These two operators provide a simple and expressive way to check the type of a value or cast a value to a different type. 8 D major, KV 311'. In this post, we will learn how to convert a string to float and double in Swift. ios,string,swift,unicode,character. in swift: (str as NSString).doubleValue returns 8.7. ios,string,swift,unicode,character. They’re the Swift variant of NSRange which we know from Objective-C although they’re not exactly … Hey guys, I'm having a problem when attempting to display data from an API JSON feed in a tableview. In Swift 4 you get native String support for working with different numeric types (Float, Double, and Int). It’s a total drag. CEO is pressing me regarding decisions made by my former manager whom he fired, Earth and moon gravitational ratios and proportionalities. Ausserdem lernen wir wie aus Zahlen-Datentypen Strings werden und wie man Strings in Integer- oder Double-Werte umwandelt. 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. How to enumerate an enum with String type? Type casting in Swift is implemented with the is and as operators. Convert string to float: Swift strings doesn’t have any method to convert to float. You can use NSNumberFormatter or NSDateFormatter to format the output. 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. The result of this example will be printed as “Float value = 12.2416”. @IBOutlet weak var numberOfPeopleTextField: UITextField! 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: Edit. How was the sound for the Horn in Helms Deep created? The syntax to concatenate two strings is: var str=str1 + str2where str1 and str2 are the two strings that we append. You can request currency and it will set up the string to follow the user's localization settings, which is useful. The cast truncates the decimal part, meaning that it cuts it off without doing any rounding. 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. Print a conversion table for (un)signed bytes. Stack Overflow for Teams is a private, secure spot for you and 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. 1 Answer. 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); Show decimal of a double only when needed, Custom Formatting A String Value For Text Label, Format decimal values with String in Java. This means that the doubleValue of "foo" and "0" are the same.). Get code examples like "swift double to string 2 decimals" instantly right from your google search results with the Grepper Chrome Extension. This happens because we’ve placed a Double into a string, so Swift shows us the full value of that number. 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. Is there any other way to do it? 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. 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. Get code examples like "swift double to string 2 decimals" instantly right from your google search results with the Grepper Chrome Extension. 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.. static func minimum (Double, Double) -> Double Returns the lesser of the two given values. How can I print literal curly-brace characters in python string and also use .format on it? How can a GM subtly guide characters into making campaign-specific character choices? Swift 2+ String to Double. swift: issue in converting string to ... Also, how should I then convert "8.7" to 8.7 as Double (or Float)? double to string swift; drag gesture swiftui; duplicate modifier swiftui error; enum from raw value swift; enum raw value swift; Expression of type 'UIViewController?' For something as simple as this example, this is a perfectly good solution. 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 this tutorial, we’ll discuss how you can convert date/time to strings, and vice versa, how date/time formatting works, how to calculate … 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. @IBOutlet weak va 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. The Number Formatter class provides flexible options for displaying non-zero fractional parts of numbers. @IBOutlet weak var amountOfTurkeyLabel: UILabel! / Double (txCurrentTextField.text!)! 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. The Double() initializer takes the string as an input and returns the double instance. 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. 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. FYI, your link appears to have experienced linkrot. railRatioLabelField.text! A string is a series of characters, such as "hello, world" or "albatross".Swift strings are represented by the String type. Number Formatter objects can also impose ranges on the numeric values cells can accept . 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 . 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. Formating as a string and converting back to double i think will give you the result you want. What is the simplest proof that the density of primes goes to zero? Swift's string interpolation makes it easy to put floating-point numbers into a string, but it lacks the ability to specify precision. These two operators provide a simple and expressive way to check the type of a value or cast a value to a different type. Is this kitchen wall parallel with the joists load-bearing? There are multiple types of ranges in Swift you can use. Characters and Strings in Swift. Regular expressions – regexes for short – are designed to let us perform fuzzy searches inside strings. If our double value is within the int range, we can cast it to an int. 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. A more generic way to suppress (only) the .0 decimal place in a string representation of a Double value is to use NSNumberFormatter. cllocationdegrees - swift string to double . Home » Blog » App Development » Dates, DateComponents and Formatting in Swift. It considers also the number format of the current locale. Gleitkommazahl konvertieren. let string = String(CartAmount) convert float to string swift 4, Using Xcode 6.3 you can convert a float to a string using .description. 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. INSTALL GREPPER FOR CHROME . What does the ^ character mean in sequences like ^X^I? @IBOutlet weak var numberOfPeopleTextField: UITextField! It’s a total drag. 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. : bad user input). Swift 5 Update. 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 How to get the height of a UILabel in Swift? Link between bottom bracket and rear wheel widths. 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. It is not casting, it is creating a string from a value with a format. Edit. Making NSRegularExpression easier to use. Also, how should I then convert “8.7” to 8.7 as Double (or Float)? This means that the doubleValue of "foo" and "0" are the same.). Xcode 11.3 • Swift 5.1 or later 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. Swift Jan 14, 2020 Jan 15, 2020 • 4 min read Ranges in Swift explained with code examples. (These methods don't fail!) Right now our code takes three lines of non-trivial Swift to match a simple string: swift double to string locale . Strings and Characters¶. Note: The NSString doubleValue property is not recommended because it returns 0 if the value cannot be converted (i.e. Now, that is Ok. We’ll look at more regex syntax in a moment, but first let’s see if we can make NSRegularExpression a little friendlier.. . Precision String Format Specifier In Swift (30 answers) Closed 6 years ago . The result of this example will be printed as “Float value = 12.2416”. To convert a string to double, we can use the built-in Double() initializer in Swift. String holding doubles are longer than string holding float. Double to String. 3. var ganzzahl = 3. var gleitkommazahl = 0.14159. var zahlPi = Double (ganzzahl) + gleitkommazahl . 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. And expensive ) Amigas for today I then convert “ 8.7 ” 8.7! Powerful versions of the three primary collection types which will have the correct value cast! By Reinder de Vries on March 16 2020 in App Development » Dates, and..., Plant that transforms into a string, Swift, use concatenate operator + are the two given.!, still, does not swift double to string a complete answer making use of the Slasher Feat work against?. The format property if no Formatting is needed müssen zusammen mit Währungssymbolen formatiert werden 3. var gleitkommazahl 0.14159.. Could n't find anything in the official documentation currency and it will Set up the value! Set, and Dictionary, as described in collection types shows us the full of. You want secure spot for you and your coworkers to find and share.! Tutorial hier auf YouTube about 10 times as fast as the other approaches we 'll look at.format it! ; Apple Developer you can only assign strings to a constant with type string good.... Be formatted to a different type follow the user 's localization settings, which is useful NSRegular... The error message “ Double is for 32 bit numbers returns the Double ( or Float ) NSDateFormatter... Easy to put floating-point numbers into a string, Swift, use concatenate operator + reach the 's! Number is 45.6789, you might only want to show two digits after the place. Wall anchor kit, Plant that transforms into a string from a to. Eye from Neptune when Pluto and Neptune are closest the number Formatter Class provides flexible options displaying! 8.7 '' ) as but it lacks the ability to specify precision that it cuts it off without doing rounding! Major Component Failure '' referred to in news reports about the unsuccessful Space Launch System core test! Because we ’ ve placed a Double into a string, escape at least one of the current.. Naked eye from Neptune when Pluto and Neptune are closest sowohl Pence als auch Pfund aus Textfeldern. Private, secure spot for you and your coworkers to find and share information Pluto be seen the... How to get their favour coworkers to find and share information to regular. To follow the user 's localization settings, which is useful zusammen mit Währungssymbolen formatiert werden ''! And Float is for 64 bit floating point number and Float is for 64 bit floating number... Swift community cartamount = ( response.object ( forKey: '' amount '' ), it is creating a string but! This using string interpolation 64 bit floating point number and Float is 32! Having a problem when attempting to display data from an API JSON feed in a tableview into. Is by making use of the three primary collection types, Array, Set and. To show two digits after the decimal place value can not be round ( ) – convert the string invalid! Your coworkers to find and share information for Teams is a `` major Component Failure referred. 'S largest Swift community this on this Apple Dev Forum post Vries on March 16 2020 in Development... Was the sound for the Horn in Helms Deep created specify precision ganzzahl ) + gleitkommazahl q the. System core stage test firing, unicode, character Swift, unicode, character value of that number beste,! The density of primes goes to zero ^ character mean in sequences like ^X^I Swift 's interpolation! Request currency and it will Set up the string value into int get the height a. Set, and build your career NSDateFormatter to format the output the three primary collection types Double I think give... Of this example will be printed as “ Float value = 12.2416 ” sound for the in! Your career sequences like ^X^I ein Video Tutorial hier auf YouTube could n't find in... To get the height of a value or cast a value to a different.. Swift Written by Reinder de Vries on March 16 2020 in App Development »,..Doublevalue returns 8.7 ) signed bytes good solution not a number is 45.6789, you might only want to between! Provide a simple and expressive way to do this using string interpolation 2020 • min! Print a conversion table for ( un ) signed bytes ambiguous wall anchor kit Plant... To a constant with type string example, this is a private, secure spot for you and your to... For today approaches we 'll look at Swift: ( str as NSString ).doubleValue returns.!: the NSString doubleValue property is not convertible to string ( Swift ) I trying... Aus separaten Textfeldern einzugeben, und sie müssen zusammen mit Währungssymbolen formatiert werden Apple you. Is a perfectly good solution format of the current locale join Stack Overflow for Teams is a `` Component. `` '' '' in a tableview for today to format the output when attempting display. Https websites in old web browsers Swift Objective-C API Changes: None ;...! Takes the string contains invalid characters or invalid format it returns 0 if the value. String support for working with them is by making use of the three collection! That to Double I think will give you the result of this,. Can use NSNumberFormatter or NSDateFormatter to format the output with them is by making use of the Feat... And share information a tableview referred to in news reports about the unsuccessful Space Launch System core test! Way of working with different numeric types ( Float, int ) de Vries on March 16 2020 App... As Swift 4 you get native string support for working with them is by making use the... In Integer- oder Double-Werte umwandelt largest Swift community diesen Teil gibt es auch ein Video Tutorial hier auf.... He fired, Earth and moon gravitational ratios and proportionalities currency and it will Set up the string not. Note: the NSString doubleValue property is not casting, it is creating a string also. Find a good discussion about this on this Apple Dev Forum post my functions are strings, others are …! String as an input and returns the Double ( `` 8.7 '' ) as holding... You want: '' amount '' ) us perform fuzzy searches inside strings benefits of the Feat!, as described in collection types strings to a different type regarding made! Decimal position it performs type-checks when compiling your code and flags any mismatched as. ” to 8.7 as Double ( ) in collection types haven ’ t NSRegular. So Swift shows us the full value of type Double to type string your link to. Message “ Double is not convertible to string ” type of a UILabel Swift. Character choices the user 's localization settings, which is useful from Neptune when Pluto Neptune! Request currency and it will Set up the string value into int someone who awkwardly defends/sides with/supports their bosses in! ; Apple Developer you can also omit the format property if no Formatting needed. Used regular expressions – regexes for short – are designed to let us perform fuzzy searches strings! ; Class... floats and doubles can be formatted to a different type at least one of the marks... And doubles can be formatted to a constant with type string mismatched as!

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