Swift 3.0版本適用
1.CGFloat 轉(zhuǎn)化成String
dateCell.detailDateLabel.text = String.init(format:"%.2f", order.fare!)
2.String 轉(zhuǎn)化成CGFloat
func StringToFloat(str:String)->(CGFloat){

    let string = str
    var cgFloat:CGFloat = 0
    

    iflet doubleValue = Double(string)
    {
        cgFloat = CGFloat(doubleValue)
    }
    return cgFloat
}

func stringToInt(str:String)->(Int){

    let string = str
    var int:Int?
    iflet doubleValue = Int(string) {
        int = Int(doubleValue)
    }
    if int ==nil
    {
        return0
    }
    return int!
}