我正在格式化一个 UITextField
,这样它在输入时变成逗号分隔(十进制样式)。
所以 12345678
变成了 12,345,678
现在,当我编辑 UITextField
时,说我想删除 5
,那时我在 5
之后点击并删除它,但是光标立即移动到文本末尾,即 8
之后。
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
}
它是这样调用的:
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
}
我已经尝试了以下但徒劳无功:
光标移动的原因可能是什么? 它应该类似于 this 链接中的内容 任何帮助将不胜感激!
最佳答案
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
}
关于swift - 光标移动到编辑格式化十进制文本字段时结束 - Swift,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53440489/