1，多行文本控件的创建
let textview = UITextView(frame:CGRect(x:10, y:100, width:200, height:100))
textview.layer.borderWidth = 1 //边框粗细
textview.layer.borderColor = UIColor.gray.cgColor //边框颜色
self.view.addSubview(textview)
2，是否可编辑
textview.isEditable = false
3，内容是否可选
textview.isSelectable = false
4，属性font设置字体，textColor设置字体颜色，textAlignment设置对齐方式（与UITextField使用方法一致）
textview.font=UIFont.systemFont(ofSize:12)
textview.textColor=UIColor.red
textview.textAlignment= .center
textAlignment不同设置：
case left // Visually left aligned 居左
case center // Visually centered 居中
case right // Visually right aligned /* !TARGET_OS_IPHONE */ // Visually right aligned // Visually centered
case justified // Fully-justified. The last line in a paragraph is natural-aligned.
case natural // Indicates the default alignment for script
5，给文字中的电话号码和网址自动加链接
textview.dataDetectorTypes = [] //都不加链接
textview.dataDetectorTypes = UIDataDetectorTypes.phoneNumber //只有电话加链接
textview.dataDetectorTypes = UIDataDetectorTypes.link //只有网址加链接
textview.dataDetectorTypes = UIDataDetectorTypes.all //电话和网址都加
6，自定义选择内容后的菜单
我们在看新闻或小说的时候，常常在点选文字后会弹出菜单进行选择，复制，粘贴等操作。我们可以在这个菜单上添加一些其他内容，如加上“邮件”“微信”等按钮选项
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let textview = UITextView(frame:CGRect(x:10, y:100, width:200, height:100))
textview.layer.borderWidth = 1 //边框粗细
textview.layer.borderColor = UIColor.gray.cgColor //边框颜色
self.view.addSubview(textview)
let mail = UIMenuItem(title: "邮件", action: #selector(ViewController.onMail))
let weixin = UIMenuItem(title: "微信", action: #selector(ViewController.onWeiXin))
let menu = UIMenuController()
menu.menuItems = [mail,weixin]
}
@objc func onMail(){
print("mail")
}
@objc func onWeiXin(){
print("weixin")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
