Convert Float to Int in Swift

Question

I want to convert a Float to an Int in Swift  Basic casting like this does not work because these types are not primitives  unlike floats and ints in Objective-C  var float  Float   2 2 var integer  Int   float as Float   But this produces the following error message       Float  is not convertible to  Int    Any idea how to property convert from Float to Int

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Suppose you store float value in  X  and you are storing integer value in  Y    Var Y   Int x     or   var myIntValue   Int myFloatValue

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You can get an integer representation of your float by passing the float into the Integer initializer method    Example   Int myFloat    Keep in mind  that any numbers after the decimal point will be loss  Meaning  3 9 is an Int of 3 and 8 99999 is an integer of 8

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Converting is simple   let float   Float 1 1     1 1 let int   Int float     1   But it is not safe   let float   Float Int max    1 let int   Int float    Will due to a nice crash   fatal error  floating point value can not be converted to Int because it is greater than Int max   So I ve created an extension that handles overflow   extension Double          If you don t want your code crash on each overflow  use this function that operates on optionals        E g   Int Double Int max    1  will crash         fatal error  floating point value can not be converted to Int because it is greater than Int max     func toInt   - gt  Int            if self  gt  Double Int min   amp  amp  self  lt  Double Int max                return Int self            else               return nil                     extension Float       func toInt   - gt  Int            if self  gt  Float Int min   amp  amp  self  lt  Float Int max                return Int self            else               return nil                     I hope this can help someone

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var floatValue   10 23 var intValue   Int floatValue    This is enough to convert from float to Int

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Explicit Conversion Converting to Int will lose any precision  effectively rounding down   By accessing the math libraries you can perform explicit conversions  For example  If you wanted to round down and convert to integer  let f   10 51 let y   Int floor f    result is 10  If you wanted to round up and convert to integer  let f   10 51 let y   Int ceil f    result is 11  If you want to explicitly round to the nearest integer let f   10 51 let y   Int round f    result is 11  In the latter case  this might seem pedantic  but it s semantically clearer as there is no implicit conversion   important if you re doing signal processing for example

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Like this   var float Float   2 2    2 2 var integer Int   Int float     2    will always round down   3 9 will be 3 var anotherFloat  Float   Float integer     2 0

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You can type cast like this    var float Float   2 2  var integer Int   Int float

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Most of the solutions presented here would crash for large values and should not be used in production code  If you don t care for very large values use this code to clamp the Double to max min Int values  let bigFloat     Float greatestFiniteMagnitude let smallFloat   -bigFloat  extension Float       func toIntTruncated   - gt  Int           let maxTruncated    min self  Float Int max  nextDown          let bothTruncated   max maxTruncated  Float Int min           return Int bothTruncated              This crashes     let bigInt   Int bigFloat      this works for values up to 9223371487098961920 let bigInt     bigFloat toIntTruncated   let smallInt   smallFloat toIntTruncated

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Use Int64 instead of Int  Int64 can store large int values

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There are lots of ways to round number with precision  You should eventually use swift s standard library method rounded   to round float number with desired precision   To round up use  up rule   let f  Float   2 2 let i   Int f rounded  up      3   To round down use  down rule   let f  Float   2 2 let i   Int f rounded  down      2   To round to the nearest integer use  toNearestOrEven rule   let f  Float   2 2 let i   Int f rounded  toNearestOrEven      2   Be aware of the following example   let f  Float   2 5 let i   Int roundf f      3 let j   Int f rounded  toNearestOrEven      2

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You can convert Float to Int in Swift like this   var myIntValue Int   Int myFloatValue  println  My value is   myIntValue     You can also achieve this result with  paulm s comment   var myIntValue   Int myFloatValue

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var i   1 as Int  var cgf   CGFLoat i

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Use a function style conversion  found in section labeled  Integer and Floating-Point Conversion  from  The Swift Programming Language   iTunes link      1 gt  Int 3 4   R1  Int   3

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Just use type casting   var floatValue Float   5 4  var integerValue Int   Int floatValue    println  IntegerValue     integerValue      it will show roundoff value eg  IntegerValue   5 means the decimal point will be loss

[swift] Convert Float to Int in Swift

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