UITextField，UITextView字数限制（swift）

来源：互联网发布：js获取input文本框宽度编辑：程序博客网时间：2024/05/22 03:38

在开发中, 有些时候会碰到这样的需求: 希望输入框有最大字数限制. 比如, 用户昵称长度限制, 评论最大字数限制.下面我就介绍一种方法，希望能帮到你！

import UIKit

class ViewController: UIViewController{

@IBOutlet var textField: UITextField!@IBOutlet var textView: UITextView!let MAX_STARWORDS_LENGTH = 10override func viewDidLoad() {    super.viewDidLoad()    // Do any additional setup after loading the view, typically from a nib.    NotificationCenter.default.addObserver(self, selector: #selector(self.textFiledEditChanged(sender:)), name: NSNotification.Name.UITextFieldTextDidChange, object: nil)    NotificationCenter.default.addObserver(self, selector: #selector(textViewEditChanged(sender:)), name: NSNotification.Name.UITextViewTextDidChange, object: nil);}func textFiledEditChanged(sender:NSNotification) {    print(textField.text! as String)    let lang = textInputMode?.primaryLanguage    if lang == "zh-Hans" {        let range = textField.markedTextRange        if range == nil {            if (textField.text?.characters.count)! >= MAX_STARWORDS_LENGTH {                textField.text = textField.text?.substring(to: (textField.text?.index(textField.text!.startIndex, offsetBy: MAX_STARWORDS_LENGTH))!)            }        }    }    else {        if (textField.text?.characters.count)! >= MAX_STARWORDS_LENGTH {            textField.text = textField.text?.substring(to: (textField.text?.index(textField.text!.startIndex, offsetBy: MAX_STARWORDS_LENGTH))!)        }    }}func textViewEditChanged(sender:NSNotification) {    let textVStr = textView.text as NSString    if (textVStr.length >= MAX_STARWORDS_LENGTH) {        let str = textVStr.substring(to: MAX_STARWORDS_LENGTH)        textView.text = str    }}override func didReceiveMemoryWarning() {    super.didReceiveMemoryWarning()    // Dispose of any resources that can be recreated.}

}
赶快试试吧，哈哈哈～～～

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