import UIKit private var textfieldd = UITextField() class TextFieldViewController: UIViewController,UITextFieldDelegate { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. //设置大小 textfieldd.frame = CGRect(x: 0, y: 100, 300, height: 50) // 设置 样式 (.none 无边框 .line 直线边框 .roundedRect 圆角矩形边框 .bezel 边线+阴影) textfieldd.borderStyle = .roundedRect //提示字 textfieldd.placeholder = "提示字" textfieldd.textColor = UIColor.blue textfieldd.font = UIFont.boldSystemFont(ofSize: 20) textfieldd.textAlignment = .right // 设置 文字超出文本框时自适应大小 textfieldd.adjustsFontSizeToFitWidth = true // 设置 最小可缩小的字号 textfieldd.minimumFontSize = 14 //清理按钮 textfieldd.clearButtonMode = .whileEditing //键盘样式 textfieldd.keyboardType = .default textfieldd.delegate = self self.view.addSubview(textfieldd) } ////////////////////////////////代理方法//////////////////////////////////// // 输入框询问是否可以编辑 true 可以编辑 false 不能编辑 func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool { print("我要开始编辑了...") return true } // 该方法代表输入框已经可以开始编辑 进入编辑状态 func textFieldDidBeginEditing(_ textField: UITextField) { print("我正在编辑状态中...") } // 输入框将要将要结束编辑 func textFieldShouldEndEditing(_ textField: UITextField) -> Bool { print("我即将编辑结束...") return true } // 输入框结束编辑状态 func textFieldDidEndEditing(_ textField: UITextField) { print("我已经结束编辑状态...") } // 文本框是否可以清除内容 func textFieldShouldClear(_ textField: UITextField) -> Bool { return true } // 输入框按下键盘 return 收回键盘 func textFieldShouldReturn(_ textField: UITextField) -> Bool { textField.resignFirstResponder() return true } // 该方法当文本框内容出现变化时 及时获取文本最新内容 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { return true } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } /* // MARK: - Navigation // In a storyboard-based application, you will often want to do a little preparation before navigation override func prepare(for segue: UIStoryboardSegue, sender: Any?) { // Get the new view controller using segue.destinationViewController. // Pass the selected object to the new view controller. } */ }