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iosswiftcastingswift-playgroundtypecasting-operator

How to cast numeric types?

I am using Xcode playground to downcast in swift. Typecasting would normally allow me to convert a type to derived type using As operator in swift. But it gives me error while i try to typecast var a as Double,String. Thanks in advance!!

   var a = 1
   var b = a as Int
   var c = a as Double
   var d = a as String
Solution

  • You cannot cast it to each other because they do not relate. You can only cast types that are related like UILabel and UIView or [AnyObject] and [String]. Casting an Int to a Double would be like trying to cast a CGPoint to a CGSize

    So to change for example an Int to a Double you have to make a new Double of that Int by doing Double(Int).

    This applies to all numeric types like UInt Int64 Float CGFloat etc.