Swift UI – 多行文本输入框（UITextView）

注：代码已升级至Swift4

多行文本控件的创建

文本输入框支持的样式：

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)

文本内容

//设置显示内容
textView.text ="Welcome to AppBlog.CN"

是否可滚动

//是否可以滚动
textView.scrollEnabled = true

文本高度

//自适应高度
textView.autoresizingMask = UIViewAutoresizing.FlexibleHeight

//获取内容整体高度
var height:CGFloat = textView.contentSize.height

是否可编辑

textview.isEditable = false

内容是否可选

textview.isSelectable = false

文本选中

//选中一段文本
textView.becomeFirstResponder()
textView.selectedRange = NSMakeRange(30, 10)

字体及颜色

//背景颜色设置
textView.backgroundColor = UIColor.grayColor()

//设置textview里面的字体颜色
textView.textColor = UIColor.greenColor()

//设置文本字体
textView.font = UIFont.systemFontOfSize(18);  //使用系统默认字体，指定14号字号
textView.font = UIFont(name: "Helvetica-Bold", size: 18)  //指定字体，指定字号

设置对齐方式

//文本对齐方式
textView.textAlignment = .left

//其中UITextField的文本的对齐方式
public enum NSTextAlignment : Int {
    case left // Visually left aligned
    case center // Visually centered
    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
}

设置圆角

//文本视图设置圆角
textView.layer.cornerRadius = 20
textView.layer.masksToBounds = true

设置富文本

//设置富文本
var attributeString:NSMutableAttributedString=NSMutableAttributedString(string: "经常听到，押金不退，晚一天交房租，被讹了。网上报价不真实？经常被忽悠")

//设置字体颜色
attributeString.addAttribute(NSForegroundColorAttributeName, value: UIColor.greenColor(), range: NSMakeRange(0, attributeString.length)) 

//文本所有字符字体HelveticaNeue-Bold，16号
attributeString.addAttribute(NSFontAttributeName, value: UIFont(name: "HelveticaNeue-Bold", size: 16)!, range: NSMakeRange(0, attributeString.length))       

//文本0开始5个字符字体HelveticaNeue-Bold，16号
attributeString.addAttribute(NSFontAttributeName, value: UIFont(name: "HelveticaNeue-Bold", size: 26)!, range: NSMakeRange(0, 5))

//设置字体颜色
attributeString.addAttribute(NSForegroundColorAttributeName, value: UIColor.whiteColor(), range: NSMakeRange(0, 3))

//设置文字背景颜色
attributeString.addAttribute(NSBackgroundColorAttributeName, value: UIColor.orangeColor(), range: NSMakeRange(3, 3))

//赋值富文本
textView.attributedText = attributeString

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

//是否允许点击链接和附件
textView.isSelectable = true

返回键类型

//返回键的类型
textView.returnKeyType = UIReturnKeyType.Done

//键盘的返回键类型
public enum UIReturnKeyType : Int {  
    case `default`
    case go
    case google
    case join
    case next
    case route
    case search
    case send
    case yahoo
    case done
    case emergencyCall
    @available(iOS 9.0, *)
    case `continue`
}

键盘类型

//键盘类型
textView.keyboardType = UIKeyboardType.Default
键盘的类型也是比较多的
public enum UIKeyboardType : Int {
    case `default` // Default type for the current input method.
    case asciiCapable // Displays a keyboard which can enter ASCII characters
    case numbersAndPunctuation // Numbers and assorted punctuation.
    case URL // A type optimized for URL entry (shows . / .com prominently).
    case numberPad // A number pad with locale-appropriate digits (0-9, ۰-۹, ०-९, etc.). Suitable for PIN entry.
    case phonePad // A phone pad (1-9, *, 0, #, with letters under the numbers).
    case namePhonePad // A type optimized for entering a person's name or phone number.
    case emailAddress // A type optimized for multiple email address entry (shows space @ . prominently).
    @available(iOS 4.1, *)
    case decimalPad // A number pad with a decimal point.
    @available(iOS 5.0, *)
    case twitter // A type optimized for twitter text entry (easy access to @ #)
    @available(iOS 7.0, *)
    case webSearch // A default keyboard type with URL-oriented addition (shows space . prominently).
    @available(iOS 10.0, *)
    case asciiCapableNumberPad // A number pad (0-9) that will always be ASCII digits.   
    public static var alphabet: UIKeyboardType { get } // Deprecated
}

自定义选择内容后的菜单

在点选文字后会弹出菜单进行选择，复制等操作。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()
    }
}