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Ios 在shouldChangeCharactersIn中将文本设置为UITextField后,光标将结束_Ios_Swift_Uitextfield - Fatal编程技术网

Ios 在shouldChangeCharactersIn中将文本设置为UITextField后,光标将结束

Ios 在shouldChangeCharactersIn中将文本设置为UITextField后,光标将结束,ios,swift,uitextfield,Ios,Swift,Uitextfield,我有一个文本标签,里面有电话号码。当用户键入时,我会屏蔽电话号码,以便在中应更改功能中的字符 我获取用户输入(字符串) 将该输入添加到已写入UITextField 屏蔽文本并将其设置为UITextField 返回错误 我的问题是,在我设置了UITextfield(删除或添加新字符UITextfield)的文本后,光标移到了末尾,但我希望它保持在相同的位置。(意思是相同的位置,我的意思是当我没有实现shouldChangeCharactersIn函数时相同)我该怎么做?谢谢 func text

我有一个文本标签,里面有电话号码。当用户键入时,我会屏蔽电话号码,以便在
中应更改
功能中的字符

  • 我获取用户输入(字符串)
  • 将该输入添加到已写入
    UITextField
  • 屏蔽文本并将其设置为
    UITextField
  • 返回错误
我的问题是,在我设置了
UITextfield
(删除或添加新字符
UITextfield
)的文本后,光标移到了末尾,但我希望它保持在相同的位置。(意思是相同的位置,我的意思是当我没有实现
shouldChangeCharactersIn
函数时相同)我该怎么做?谢谢

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    guard CharacterSet(charactersIn: "0123456789").isSuperset(of: CharacterSet(charactersIn: string)) else {
        return false
    }
    if let text = textField.text {
        let newLength = text.count + string.count - range.length
        let newText = text + string

        let textFieldText: NSString = (textField.text ?? "") as NSString
        let txtAfterUpdate = textFieldText.replacingCharacters(in: range, with: string)
            if(newLength <= 15){
                //textField.text = txtAfterUpdate
                textField.text = txtAfterUpdate.digits.applyPatternOnNumbers()
                return false
            }
            return newLength <= 15
    }
    return true
}
func textField(textField:UITextField,shouldChangeCharacters范围:NSRange,replacementString:string)->Bool{
保护字符集(字符sin:“0123456789”)。isSuperset(of:CharacterSet(字符sin:string))else{
返回错误
}
如果let text=textField.text{
让newLength=text.count+string.count-range.length
让newText=文本+字符串
将textFieldText:NSString=(textField.text???)设为NSString
让txtAfterUpdate=textFieldText.replacingCharacters(在:范围内,带:字符串)
if(newLength
func textField(textField:UITextField,shouldChangeCharacters范围:NSRange,replacementString:string)->Bool{
保护字符集(字符sin:“0123456789”)。isSuperset(of:CharacterSet(字符sin:string))else{
返回错误
}
如果let text=textField.text{
让newLength=text.count+string.count-range.length
让newText=文本+字符串
将textFieldText:NSString=(textField.text???)设为NSString
让txtAfterUpdate=textFieldText.replacingCharacters(在:范围内,带:字符串)
如果(新长度2){
当前位置=1
}否则{
当前位置=0
}
}否则如果(当前位置==7){
当前位置=4
}否则如果(currentPosition==11){
当前位置=9
}否则如果(当前位置==14){
当前位置=12
}否则{
如果(当前位置!=1){
currentPosition=currentPosition-1
}
}
}否则{
如果(currentPosition==0){
当前位置=2
}else if(当前位置==4){
当前位置=7
}否则如果(当前位置==9){
当前位置=11
}否则如果(当前位置==12){
当前位置=14
}否则{
当前位置=当前位置+1
}
}
textField.text=txtAfterUpdate.applyPatternOnNumbers()
打印(“textField长度->:\(textField.text?.count??0)”)
如果让newPosition=textField.position(from:textField.beginingofdocument,offset:currentPosition){
textField.selectedTextRange=textField.textRange(从:newPosition到:newPosition)
}
返回错误
}

返回NealStudio @埃姆雷Unter Nead,它可以帮助你,当我使它返回真,它增加了额外的字符,因为我们已经设置了新的文本与TeXField.Trime= @埃姆雷Onter No.China我更新的代码。它将按你想要的标准工作。谢谢。这不会屏蔽电话号码吗?@埃姆雷OutnDe请再检查一次它将被完成。
func applyPatternOnNumbers(pattern: String = "(###) ### ## ##", replacmentCharacter: Character = "#") -> String {
var pureNumber = self.replacingOccurrences( of: "[^0-9]", with: "", options: .regularExpression)
for index in 0 ..< pattern.count {
    guard index < pureNumber.count else { return pureNumber }
    let stringIndex = String.Index(encodedOffset: index)
    let patternCharacter = pattern[stringIndex]
    guard patternCharacter != replacmentCharacter else { continue }
    pureNumber.insert(patternCharacter, at: stringIndex)
}
return pureNumber
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

        guard CharacterSet(charactersIn: "0123456789").isSuperset(of: CharacterSet(charactersIn: string)) else {
            return false
        }
        if let text = textField.text {
            let newLength = text.count + string.count - range.length
            let newText = text + string

            let textFieldText: NSString = (textField.text ?? "") as NSString
            let txtAfterUpdate = textFieldText.replacingCharacters(in: range, with: string)
            if(newLength <= 15){

                var currentPosition = 0
                if let selectedRange = textField.selectedTextRange {
                    currentPosition = textField.offset(from: textField.beginningOfDocument, to: selectedRange.start)
                }

                if(string == ""){
                    if(currentPosition == 2){
                        if(textField.text!.count > 2){
                            currentPosition = 1
                        }else{
                            currentPosition = 0
                        }
                    }else if(currentPosition == 7){
                        currentPosition = 4
                    }else if(currentPosition == 11){
                        currentPosition = 9
                    }else if(currentPosition == 14){
                        currentPosition = 12
                    }else{
                        if(currentPosition != 1){
                            currentPosition = currentPosition - 1
                        }
                    }
                }else{
                    if(currentPosition == 0){
                        currentPosition = 2
                    }else if(currentPosition == 4){
                        currentPosition = 7
                    }else if(currentPosition == 9){
                        currentPosition = 11
                    }else if(currentPosition == 12){
                        currentPosition = 14
                    }else{
                        currentPosition = currentPosition + 1
                    }
                }

                textField.text = txtAfterUpdate.applyPatternOnNumbers()
                print("textField Length -> : \(textField.text?.count ?? 0)")

                    if let newPosition = textField.position(from: textField.beginningOfDocument, offset: currentPosition) {
                        textField.selectedTextRange = textField.textRange(from: newPosition, to: newPosition)
                    }

                return false
            }
            return newLength <= 15
        }
        return true
    }