swift 常见输入限制(手机号+身份证+金额输入+验证码）

swift 常见输入限制

1、数字+输入位数 判断

extension 自己的VC或view : UITextFieldDelegate {
    
  func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool{
       
       if string.count == 0 {
           return true
       }
       let existedLength = textField.text?.count
       let selectedLength = range.length
       let replaceLength = string.count
       //判断是纯数字
       var numberRes = true
       var lenghtBool = true
       
       let tmSet = CharacterSet(charactersIn:"0123456789")
       var i = 0
       while i < string.count {
           let string1:NSString = (string as NSString).substring(with: NSMakeRange(i, 1)) as NSString
           let range = string1.rangeOfCharacter(from: tmSet)
           if (range.length == 0) {
               numberRes = false
               break
           }
           i += 1
       }
       
       if existedLength! - selectedLength + replaceLength > 11{
           lenghtBool = false
       }else{
           lenghtBool = true
       }
       
       //MARK:---输入框只能输入数字 并且长度是 11位
        if self.selectType == 1 { 
             if textField == self.phoneTF {
                 if numberRes == true && lenghtBool == true {
                     return true
                 }else{
                     return false
                 }
             }
        }
       return true
   }

}

2、输入金额 控制小数点后两位 如：.xx

extension  自己的VC或View: UITextFieldDelegate {
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool  {
        let existedLength = textField.text?.count
        let selectedLength = range.length
        let replaceLength = string.count
        
        if existedLength! - selectedLength + replaceLength > 12 {
            return false
        }
        //控制小数点后两位 .xx
        let newString = (textField.text! as NSString).replacingCharacters(in: range, with: string)
        //正则匹配
        let expression = "^[0-9]*((\\.|,)[0-9]{0,2})?$" //^[0-9]*((\\.|,)[0-9]{0,2})?$
        let regex = try! NSRegularExpression(pattern: expression, options:.allowCommentsAndWhitespace)
        let numberOfMatches = regex.numberOfMatches(in: newString, options: .reportProgress, range: NSMakeRange(0, (newString as NSString).length))
        return numberOfMatches != 0
    }
}

3、输入限制： 数字+字母+输入长度

extension 自己的VC或view : UITextFieldDelegate {
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
    {
        if string.count == 0 {
            return true
        }

        ///---------------1.判断输入数字 或 判断输入字母
        var ziMuFlag = true
        let ziMuSet = CharacterSet(charactersIn:"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
        var p = 0
        while p < string.count {
            let string1:NSString = (string as NSString).substring(with: NSMakeRange(p, 1)) as NSString
            let range = string1.rangeOfCharacter(from: ziMuSet)
            if (range.length == 0) {
                ziMuFlag = false
                break
            }
            p += 1
        }
        print("--ziMuFlag---\(ziMuFlag)")
        
        ///-----------------2.输入长度限制
        let existedLength = textField.text?.count
        let selectedLength = range.length
        let replaceLength = string.count
        //输入长度控制
        var lenghtBool = true
        if existedLength! - selectedLength + replaceLength > 11{
            lenghtBool = false
        }else{
            lenghtBool = true
        }
        
        if ziMuFlag == true && lenghtBool == true {
            return true
        }else{
            return false
        }
    }
}

4、身份证输入判断

extension 自己的VC或View :UITextFieldDelegate{
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool{
        
        if string.count == 0 {
            return true
        }
        let existedLength = textField.text?.count
        let selectedLength = range.length
        let replaceLength = string.count
        
        ///------------1.判断纯数字
        var numberRes = true
        let tmSet = CharacterSet(charactersIn:"0123456789")
        var i = 0
        while i < string.count {
            let string1:NSString = (string as NSString).substring(with: NSMakeRange(i, 1)) as NSString
            let range = string1.rangeOfCharacter(from: tmSet)
            if (range.length == 0) {
                numberRes = false
                break
            }
            i += 1
        }
        ///-----------------2.判断输入字母
        var ziMuFlag = true
        let ziMuSet = CharacterSet(charactersIn:"xX")
        var p = 0
        while p < string.count {
            let string1:NSString = (string as NSString).substring(with: NSMakeRange(p, 1)) as NSString
            let range = string1.rangeOfCharacter(from: ziMuSet)
            if (range.length == 0) {
                ziMuFlag = false
                break
            }
            p += 1
        }
        print("--ziMuFlag---\(ziMuFlag)")
        //----------3、判断输入长度
        var IdCardlenghtBool = true
        if existedLength! - selectedLength + replaceLength > 18 {
            IdCardlenghtBool = false
        }else{
            IdCardlenghtBool = true
        }
        ///身份证校验
        var idCardRes = true
        if numberRes == true || ziMuFlag == true {
            idCardRes = true
        }else{
            idCardRes = false
        }
        //MARK:---身份证号 只能输入规则  （纯数字 ||  xX ） + 长度(最长)18位
        if textField == self.idCardTF {
            if  idCardRes == true && IdCardlenghtBool == true {
                 return true
            }else{
                return false
            }
        }
        return true
    }
}

以上是自己在项目中亲自用到的，都很实用，希望对有相同需求的朋友有帮助。