各种属性设置

    //1.文本框的创建，有如下几个样式：

// UITextBorderStyle.none：无边框 // UITextBorderStyle.line：直线边框 // UITextBorderStyle.roundedRect：圆角矩形边框 // UITextBorderStyle.bezel：边线+阴影 let textField = UITextField(frame:CGRect(x:10, y:60, width:200, height:30)) //设置边框样式为圆角矩形 textField.borderStyle = UITextBorderStyle.roundedRect //字体属性设置 textField.textColor = UIColor.black textField.font = UIFont(name:"GillSans",size:15) textField.textAlignment = NSTextAlignment.left /** 垂直对齐 **/ //textField.contentVerticalAlignment = .top //垂直向上对齐 textField.contentVerticalAlignment = .center //垂直居中对齐 //textField.contentVerticalAlignment = .bottom //垂直向下对齐 //文本框提示文字 textField.placeholder = "请输入文字" //明文显示 textField.isSecureTextEntry = false //光标颜色 textField.tintColor = UIColor.green //文字大小超过文本框长度时自动缩小字号，而不是隐藏显示省略号 //textField.adjustsFontSizeToFitWidth = true//当文字超出文本框宽度时，自动调整文字大小 //textField.minimumFontSize = 12//最小可缩小的字号 //是否可操作 textField.isEnabled = true textField.isUserInteractionEnabled = true //背景图片设置 textField.borderStyle = .none//先要去除边框样式,否则无效 textField.background = UIImage(named:"daohanglan_touming@2x") //清除按钮（输入框内右侧小叉） textField.clearButtonMode = .whileEditing //设置文本框关联的键盘类型 // Default：系统默认的虚拟键盘 // ASCII Capable：显示英文字母的虚拟键盘 // Numbers and Punctuation：显示数字和标点的虚拟键盘 // URL：显示便于输入url网址的虚拟键盘 // Number Pad：显示便于输入数字的虚拟键盘 // Phone Pad：显示便于拨号呼叫的虚拟键盘 // Name Phone Pad：显示便于聊天拨号的虚拟键盘 // Email Address：显示便于输入Email的虚拟键盘 // Decimal Pad：显示用于输入数字和小数点的虚拟键盘 // Twitter：显示方便些Twitter的虚拟键盘 // Web Search：显示便于在网页上书写的虚拟键盘 textField.keyboardType = .default //使文本框在界面打开时就获取焦点，并弹出输入键盘(第一响应着) textField.becomeFirstResponder() //使文本框失去焦点，并收回键盘 //textField.resignFirstResponder() //设置键盘return键的样式 // textField.returnKeyType = UIReturnKeyType.done //表示完成输入 // textField.returnKeyType = UIReturnKeyType.go //表示完成输入，同时会跳到另一页 // textField.returnKeyType = UIReturnKeyType.search //表示搜索 // textField.returnKeyType = UIReturnKeyType.join //表示注册用户或添加数据 // textField.returnKeyType = UIReturnKeyType.next //表示继续下一步 // textField.returnKeyType = UIReturnKeyType.send //表示发送 textField.returnKeyType = .send //设置代理 textField.delegate = self

    // 自定义输入源控件 

// let inputview = UIButton(frame: CGRect(x:0.0, y:0.0, width:self.view.bounds.width, height:100.0)) // inputview.setImage(UIImage(named: "daohanglan_touming@2x"), for: UIControlState.normal) // inputview.backgroundColor = UIColor.lightGray // inputview.addTarget(self, action: Selector(click:), for: UIControlEvents.touchUpInside) // textField.inputView = inputview // 自定义输入源控件副视图 let accessoryview = UIView(frame: CGRect(x:0.0, y:0.0, width:self.view.frame.size.width, height:40.0)) accessoryview.backgroundColor = UIColor.green let accessoryLeft = UIButton(frame: CGRect(x:10.0, y:10.0, width:60.0, height:20.0)) accessoryview.addSubview(accessoryLeft) accessoryLeft.setTitle("取消", for: UIControlState.normal) accessoryLeft.backgroundColor = UIColor.orange accessoryLeft.addTarget(self, action: #selector(leftClick), for: UIControlEvents.touchUpInside) let accessoryRight = UIButton(frame: CGRect(x:(accessoryview.bounds.width - 10.0 - 60.0), y:10.0, width:60.0, height:20.0)) accessoryview.addSubview(accessoryRight) accessoryRight.setTitle("确定", for: UIControlState.normal) accessoryRight.backgroundColor = UIColor.orange accessoryRight.addTarget(self, action: #selector(rightClick), for: UIControlEvents.touchUpInside) textField.inputAccessoryView = accessoryview

    // 发通知-输入改变
    NotificationCenter.default.addObserver(self, selector: #selector(textFiledEditChanged), name: NSNotification.Name.UITextFieldTextDidChange, object: textField)
    
    
    self.view.addSubview(textField)
}
//键盘return按钮点击事件
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    //收起键盘
    //textField.resignFirstResponder()
    self.view .endEditing(true)
    
    print(textField.text!)
    return true;
}

// 自定义输入源控件时响应事件
// MARK: - click
func click(button:UIButton)
{
    self.view.endEditing(true)
}
//MARK: - left/right click
func leftClick(button:UIButton)
{
    print("取消")
}

func rightClick(button:UIButton)
{
    self.view.endEditing(true)
    print("确定")  
}
// 通知响应方法-限制输入长度
// MARK: - 通知响应方法
func textFiledEditChanged(notification:NSNotification)
{
    let textField:UITextField! = notification.object as! UITextField
    if (textField != nil)
    {
        let text:String! = textField.text
        let length = text.characters.count
        if (length > 20)
        {
        }
    }
}
// 代理方法
// MARK: - UITextFieldDelegate
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
    
    print("1 textFieldShouldBeginEditing")
    
    return true
}
func textFieldDidBeginEditing(_ textField: UITextField) {
    print("2 textFieldDidBeginEditing")
}

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    print("3 textField")
    
    return true
}
func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {
    print("4 textFieldShouldEndEditing")
    print("text：\(String(describing: textField.text)) length = \(String(describing: textField.text?.characters.count))")
    return true
}

func textFieldDidEndEditing(_ textField: UITextField) {
    print("5 textFieldDidEndEditing")
}

func textFieldShouldClear(_ textField: UITextField) -> Bool {
    
    print("6 textFieldShouldClear")
    return true
}

func textFieldShouldReturn(textField: UITextField) -> Bool {
    // 结束编辑
    textField.resignFirstResponder()
    print("7 textFieldShouldReturn")
    return true
}