我正在格式化UITextField
这样在输入时它就变成逗号分隔(十进制样式)。
So 12345678
变成12,345,678
现在当我编辑UITextField
,说我想删除5
,当时我点击之后5
并删除它,但光标立即移动到文本末尾,之后8
.
这是我在输入时用来格式化小数的代码:
func checkTextField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if ((string == "0" || string == "") && (textField.text! as NSString).range(of: ".").location < range.location) {
return true
}
let allowedCharacterSet = NSCharacterSet(charactersIn: "0123456789.").inverted
let filtered = string.components(separatedBy: allowedCharacterSet)
let component = filtered.joined(separator: "")
let isNumeric = string == component
if isNumeric {
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
let newString = (textField.text! as NSString).replacingCharacters(in: range, with: string)
let numberWithOutCommas = newString.replacingOccurrences(of: ",", with: "")
let number = formatter.number(from: numberWithOutCommas)
if number != nil {
var formattedString = formatter.string(from: number!)
if string == "." && range.location == textField.text?.count {
formattedString = formattedString?.appending(".")
}
textField.text = formattedString
} else {
textField.text = nil
}
}
return false
}
它的名字是这样的:
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let textFieldText = (textField.text! as NSString).replacingCharacters(in: range, with: string)
let checkForCurrency = checkTextField(textField, shouldChangeCharactersIn: range, replacementString: string)
return checkForCurrency
}
我尝试了以下方法但没有成功:
解决方案1
解决方案2
光标移动的原因可能是什么?
它应该是类似的this关联
任何帮助,将不胜感激!
update your custom function with :
func checkTextField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let textFieldText = (textField.text! as NSString).replacingCharacters(in: range, with: string)
if ((string == "0" || string == "") && (textField.text! as NSString).range(of: ".").location < range.location) {
return true
}
var currentPosition = 0
if let selectedRange = textField.selectedTextRange {
currentPosition = textField.offset(from: textField.beginningOfDocument, to: selectedRange.start)
}
let allowedCharacterSet = NSCharacterSet(charactersIn: "0123456789.").inverted
let filtered = string.components(separatedBy: allowedCharacterSet)
let component = filtered.joined(separator: "")
let isNumeric = string == component
if isNumeric {
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
let newString = (textField.text! as NSString).replacingCharacters(in: range, with: string)
let numberWithOutCommas = newString.replacingOccurrences(of: ",", with: "")
let number = formatter.number(from: numberWithOutCommas)
if number != nil {
var formattedString = formatter.string(from: number!)
if string == "." && range.location == textField.text?.count {
formattedString = formattedString?.appending(".")
}
textField.text = formattedString
if(textFieldText.count < formattedString?.count ?? 0){
currentPosition = currentPosition + 1
}
}else{
textField.text = nil
}
}
if(string == ""){
currentPosition = currentPosition - 1
}else{
currentPosition = currentPosition + 1
}
if let newPosition = textField.position(from: textField.beginningOfDocument, offset: currentPosition) {
textField.selectedTextRange = textField.textRange(from: newPosition, to: newPosition)
}
return false
}
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