我正在尝试在用户输入时在Swift的文本字段中格式化货币输入。
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,我希望在用户输入货币时格式化货币。当我尝试在TextField操作"编辑更改"或者"值已更改",我只能输入1个数字(如果我输入8,它变为$ 8.00)但是一旦我输入第二个数字,一切都会变为0.00美元,我不能再进一步输入。
有什么建议吗?我觉得这应该是一个简单的解决办法,但我不能完全理解它。
答案 0 :(得分:19)
我今天早些时候修改了这个功能。适用于" en_US"和" fr_FR"。但是,对于" ja_JP",我用100除以创建小数是一个问题。您需要有一个switch或if / else语句,用于分隔带小数的货币和用格式化程序格式化的货币。但我认为这会让你进入你想成为的空间。
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 )
}
}
答案 1 :(得分:8)
这适用于我使用NSNumberFormatter ...
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// Construct the text that will be in the field if this change is accepted
var oldText = textField.text as NSString
var newText = oldText.stringByReplacingCharactersInRange(range, withString: string) as NSString!
var newTextString = String(newText)
let digits = NSCharacterSet.decimalDigitCharacterSet()
var digitText = ""
for c in newTextString.unicodeScalars {
if digits.longCharacterIsMember(c.value) {
digitText.append(c)
}
}
let formatter = NSNumberFormatter()
formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
formatter.locale = NSLocale(localeIdentifier: "en_US")
var numberFromField = (NSString(string: digitText).doubleValue)/100
newText = formatter.stringFromNumber(numberFromField)
textField.text = newText
return false
}
答案 2 :(得分:5)
基于@Robert回答。针对 Swift 2.0
进行了更新//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
formatCurrency(currentString)
default:
if string.characters.count == 0 && currentString.characters.count != 0 {
currentString = String(currentString.characters.dropLast())
formatCurrency(currentString)
}
}
return false
}
func formatCurrency(string: String) {
print("format \(string)")
let formatter = NSNumberFormatter()
formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
formatter.locale = NSLocale(localeIdentifier: "en_US")
let numberFromField = (NSString(string: currentString).doubleValue)/100
self.amountField.text = formatter.stringFromNumber(numberFromField)
print(self.amountField.text )
}
答案 3 :(得分:3)
对于Swift 3.0
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
// Construct the text that will be in the field if this change is accepted
switch string {
case "0","1","2","3","4","5","6","7","8","9":
currentString += string
formatCurrency(currentString)
default:
if string.characters.count == 0 && currentString.characters.count != 0 {
currentString = String(currentString.characters.dropLast())
formatCurrency(currentString)
}
}
return false }
func formatCurrency(_ string: String) {
print("format \(string)")
let formatter = NumberFormatter()
formatter.numberStyle = .currency
formatter.locale = findLocaleByCurrencyCode("NGN")
let numberFromField = (NSString(string: currentString).doubleValue)/100
let temp = formatter.string(from: NSNumber(value: numberFromField))
self.amountTextField.text = String(describing: temp!.characters.dropFirst())
}
func findLocaleByCurrencyCode(_ currencyCode: String) -> Locale? {
let locales = Locale.availableIdentifiers
var locale: Locale?
for localeId in locales {
locale = Locale(identifier: localeId)
if let code = (locale! as NSLocale).object(forKey: NSLocale.Key.currencyCode) as? String {
if code == currencyCode {
return locale
}
}
}
return locale }
答案 4 :(得分:1)
我制定了正常的货币格式(例如1为1.00美元,88885为8,8885.00美元,7555.8569为7,555.86美元。
@IBAction func lostpropertyclicked(sender: AnyObject) {
var currentString = ""
currentString = amountTF.text
formatCurrency(string: currentString)
}
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)
currentString = formatter.stringFromNumber(numberFromField)!
println(currentString )
}
答案 5 :(得分:0)
这对我有用: 但是,变量的命名需要改进。乘以10很容易,但是要弄清楚如何除以10并四舍五入就很难使用指针。
let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .currency
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField == amountTextField {
guard let text = textField.text else {return true}
let oldDigits = numberFormatter.number(from: text) ?? 0
var digits = oldDigits.decimalValue
if let digit = Decimal(string: string) {
let newDigits: Decimal = digit / 100
digits *= 10
digits += newDigits
}
if range.length == 1 {
digits /= 10
var result = Decimal(integerLiteral: 0)
NSDecimalRound(&result, &digits, 2, Decimal.RoundingMode.down)
digits = result
}
textField.text = NumberFormatter.localizedString(from: digits as NSDecimalNumber, number: .currency)
return false
} else {
return true
}
}
答案 6 :(得分:0)
雨燕5
func textField(_ textField: UITextField, shouldChangeCharactersIn 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
formatCurrency(string: currentString)
default:
if string.count == 0 && currentString.count != 0 {
currentString = String(currentString.dropLast())
formatCurrency(string: currentString)
}
}
return false
}
func formatCurrency(string: String) {
print("format \(string)")
let formatter = NumberFormatter()
formatter.numberStyle = NumberFormatter.Style.currency
formatter.locale = NSLocale(localeIdentifier: "en_US") as Locale
let numberFromField = (NSString(string: currentString).doubleValue)/100
//replace billTextField with your text field name
self.billTextField.text = formatter.string(from: NSNumber(value: numberFromField))
print(self.billTextField.text ?? "" )
}