UITextField电话号码输入框格式 xxx xxxx xxxx

问题:
项目中需要设置电话号码输入时如xxx xxxx xxxx的格式

自定义控件代码:

import UIKit

class PhoneField: UITextField {
    
    //保存上一次的文本内容
    var _previousText:String!
    
    //保持上一次的文本范围
    var _previousRange:UITextRange!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupUI()
    }

    func setupUI() {
        //默认边框样式为圆角矩形
        self.borderStyle = UITextField.BorderStyle.none
        //使用数字键盘
        self.keyboardType = UIKeyboardType.numberPad
    }
    
    
    //当本视图的父类视图改变的时候
    override func willMove(toSuperview newSuperview: UIView?) {
        //监听值改变通知事件
        if newSuperview != nil {
            NotificationCenter.default.addObserver(self,
                                                   selector: #selector(phoneNumberFormat(_:)),
                                                   name: UITextField.textDidChangeNotification,
                                                   object: nil)
        }else{
            NotificationCenter.default.removeObserver(self,
                                                      name: UITextField.textDidChangeNotification,
                                                      object: nil)
        }
    }
    
    //输入框内容改变时对其内容做格式化处理
    @objc func phoneNumberFormat(_ notification: Notification) {
        let textField = notification.object as! UITextField
        
        if(!textField.isEqual(self)){ return }
        
        guard let selectedTextRange = textField.selectedTextRange else { return }
        
        //当前光标的位置(后面会对其做修改)
        var cursorPostion = textField.offset(from: textField.beginningOfDocument,
                                             to: selectedTextRange.start)
        
        //过滤掉非数字字符,只保留数字
        let digitsText = getDigitsText(string: textField.text!,
                                       cursorPosition: &cursorPostion)
        
        //避免超过11位的输入
        if digitsText.count > 11 {
            textField.text = _previousText
            textField.selectedTextRange = _previousRange
            return
        }
        
        //得到带有分隔符的字符串
        let hyphenText = getHyphenText(string: digitsText, cursorPosition: &cursorPostion)
        
        //将最终带有分隔符的字符串显示到textField上
        textField.text = hyphenText
        
        //让光标停留在正确位置
        guard let targetPostion = textField.position(from: textField.beginningOfDocument,
                                                     offset: cursorPostion) else{ return }
        textField.selectedTextRange = textField.textRange(from: targetPostion,
                                                          to: targetPostion)
        
        //现在的值和选中范围,供下一次输入使用
        _previousText = self.text!
        _previousRange = selectedTextRange
    }
    
    //除去非数字字符,同时确定光标正确位置
    func getDigitsText(string:String, cursorPosition:inout Int) -> String{
        //保存开始时光标的位置
        let originalCursorPosition = cursorPosition
        //处理后的结果字符串
        var result = ""
        
        var i = 0
        //遍历每一个字符
        for uni in string.unicodeScalars {
            //如果是数字则添加到返回结果中
            if CharacterSet.decimalDigits.contains(uni) {
                result.append(string[i])
            }
                //非数字则跳过,如果这个非法字符在光标位置之前,则光标需要向前移动
            else{
                if i < originalCursorPosition {
                    cursorPosition = cursorPosition - 1
                }
            }
            i = i + 1
        }
        
        return result
    }
    
    //将分隔符插入现在的string中,同时确定光标正确位置
    func getHyphenText(string:String, cursorPosition:inout Int) -> String {
        //保存开始时光标的位置
        let originalCursorPosition = cursorPosition
        //处理后的结果字符串
        var result = ""
        
        //遍历每一个字符
        for i in 0  ..< string.count  {
            //如果当前到了第4个、第8个数字,则先添加个分隔符
            if i == 3 || i == 7 {
                result.append(" ")
                //如果添加分隔符位置在光标前面,光标则需向后移动一位
                if i < originalCursorPosition {
                    cursorPosition = cursorPosition + 1
                }
            }
            result.append(string[i])
        }
        
        return result
    }
}

//通过对String扩展,字符串增加下表索引功能
extension String
{
    subscript(index:Int) -> String
    {
        get{
            return String(self[self.index(self.startIndex, offsetBy: index)])
        }
        set{
            let tmp = self
            self = ""
            for (idx, item) in tmp.enumerated() {
                if idx == index {
                    self += "\(newValue)"
                }else{
                    self += "\(item)"
                }
            }
        }
    }
}

上面的代码只能根据输入改变格式,如果直接设置号码的话就会无用
这时候可以用NumberFormatter
下面为解决方法

private lazy var phoneFormatter:NumberFormatter = {
        let _formatter = NumberFormatter.init()
        _formatter.groupingSeparator = " "
        _formatter.groupingSize = 4
        _formatter.usesGroupingSeparator = true
        return _formatter
    }()
调用:
phoneTextField.text = phoneFormatter.string(from: NSNumber.init(value:"12345678901"))

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