swift - Checking the String whether it is the Number(Double) of -

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question. necessary make check string whether number(double)? exemple:

var s1:string = "df1231" var s2:string = "1231,3123" if s1.isdouble {   println("true.this number!") } else {   println("false.this not number!") //will give } if s2.isdouble {   println("true.this number!") //will give } else {   println("false.this not number!") }

not sure needs exactly, straightforward way be:

func isdouble(text:string) -> bool {     guard let _ = double(text.stringbyreplacingoccurrencesofstring(",", withstring: ".")) else { return false }     return true }  isdouble("df1231") // returns false isdouble("1231,3123") // returns true

you can copy paste playground see work.


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