我试图在
Swift的文本字段中格式化货币输入,用户输入它.
到目前为止,我只能在用户完成输入时成功格式化：
@IBAction func editingEnded(sender: AnyObject) {
let formatter = NSNumberFormatter()
formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
formatter.locale = NSLocale(localeIdentifier: "en_US")
var numberFromField = NSString(string: textField.text).doubleValue
textField.text = formatter.stringFromNumber(numberFromField)
}
但是,我希望货币在用户输入时被格式化.当我尝试在TextField操作“编辑更改”或“更改值”时,只能输入1个数字(如果输入8,则变为$8.00),但是一旦输入第二个数字,所有内容都将转到$0.00,而I不能进一步超越这一点.
有什么建议么？我觉得这应该是一个简单的修复,但我不能完全了解它.
解决方法
我修改了今天早些时候的功能.适用于“en_US”和“fr_FR”.然而,对于“ja_JP”,除以100我做创建小数是一个问题.您将需要一个开关或if / else语句来分隔货币与小数和没有格式化格式化程序的货币.但我认为这可以让你在你想成为的空间.
import UIKit
class ViewController: UIViewController,UITextFieldDelegate {
@IBOutlet weak var textField: UITextField!
var currentString = ""
override func viewDidLoad() {
super.viewDidLoad()
self.textField.delegate = self
}
//Textfield delegates
func textField(textField: UITextField,shouldChangeCharactersInRange range: NSRange,replacementString string: String) -> Bool { // return NO to not change text
switch string {
case "0","1","2","3","4","5","6","7","8","9":
currentString += string
println(currentString)
formatCurrency(string: currentString)
default:
var array = Array(string)
var currentStringArray = Array(currentString)
if array.count == 0 && currentStringArray.count != 0 {
currentStringArray.removeLast()
currentString = ""
for character in currentStringArray {
currentString += String(character)
}
formatCurrency(string: currentString)
}
}
return false
}
func formatCurrency(#string: String) {
println("format \(string)")
let formatter = NSNumberFormatter()
formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
formatter.locale = NSLocale(localeIdentifier: "en_US")
var numberFromField = (NSString(string: currentString).doubleValue)/100
textField.text = formatter.stringFromNumber(numberFromField)
println(textField.text )
}
}
