//
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// YYTextField.swift
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// OKProject
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//
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// Created by alvin_y on 2020/5/27.
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// Copyright © 2020 yangwang. All rights reserved.
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//
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import Foundation
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@IBDesignable class YYTextField: UITextField {
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/// 最大可输入字数
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@IBInspectable var maximumLength: Int = 0
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/// 最大偏移
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@IBInspectable var maximumOffset: Int = 0 {
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didSet{
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self.leftView = UIView.init(frame: CGRect.init(x: 0, y: 0, width: maximumOffset, height: 0))
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self.leftViewMode = .always
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}
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}
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private var realDelegate: UITextFieldDelegate?
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override var delegate: UITextFieldDelegate? {
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get {
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return realDelegate
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}
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set {
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realDelegate = newValue
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}
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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required init?(coder aDecoder: NSCoder) {
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super.init(coder: aDecoder)
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initialization()
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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initialization()
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}
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private func initialization() {
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super.delegate = self
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addTarget(self, action: #selector(textFieldTextDidChange(sender:)), for: .editingChanged)
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}
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@objc private func textFieldTextDidChange(sender: UITextField) {
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let string = text
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let inputMode = textInputMode?.primaryLanguage; // 键盘输入模式
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if (maximumLength > 0) {
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if (inputMode == "zh-Hans") {
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let selectedRange: UITextRange? = markedTextRange
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if selectedRange == nil {
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let substring = string!.prefix(maximumLength)
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text = String(substring)
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}
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} else {
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if (string?.count ?? 0) > maximumLength {
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let substring = string!.prefix(maximumLength)
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text = String(substring)
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}
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}
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}
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}
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}
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extension YYTextField: UITextFieldDelegate {
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func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
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if let delegate = realDelegate, delegate.responds(to: #selector(textFieldShouldBeginEditing(_:))) {
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return (delegate.textFieldShouldBeginEditing?(textField))!
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} else {
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return true
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}
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}
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func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
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if string == "\n"{
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textField.resignFirstResponder()
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}
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if let delegate = realDelegate, delegate.responds(to: #selector(textField(_:shouldChangeCharactersIn:replacementString:))) {
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return delegate.textField!(textField, shouldChangeCharactersIn: range, replacementString: string)
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} else {
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return true
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}
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}
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}
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