TabularData-Playground-Transform.swift

/**
    Convierte un `String` en `Double`
    Si no se puede convertir se devuelve 0.0
*/
func double(from string: String) -> Double
{
    let formatter = NumberFormatter();
    
    formatter.locale = Locale(identifier: "es_ES")
    formatter.numberStyle = .decimal
    formatter.thousandSeparator = "."
    formatter.decimalSeparator = ","
    
    return formatter.number(from: string)?.doubleValue ?? 0.0
}

// Podemos pasar una función...
frame2021.transformColumn("LATITUD", double(from:))
// ...o en el trailing clouse.
frame2021.transformColumn("LONGITUD") { (value: String) -> Double in
    let formatter = NumberFormatter();
    
    formatter.locale = Locale(identifier: "es_ES")
    formatter.numberStyle = .decimal
    formatter.thousandSeparator = "."
    formatter.decimalSeparator = ","
    
    return formatter.number(from: value)?.doubleValue ?? 0.0
}

// Convertimos la columna PEATONES de String a Int
frame2021.transformColumn("PEATONES") { (value: String) -> Int in
    let formatter = NumberFormatter();
    
    formatter.locale = Locale(identifier: "es_ES")
    formatter.numberStyle = .decimal
    formatter.thousandSeparator = "."
    

    return formatter.number(from: value)?.intValue ?? 0
}