iOS开发之TextView常用属性

本文介绍iOS开发的TextView控件, swift代码形式.

基本属性:

//textView尺寸和位置
        let textViewWidth: CGFloat = 223
        let textViewHeight: CGFloat = 198
        let textViewTopView: CGFloat = 240
        let textViewFrame = CGRect(x: 22, y: textViewTopView, width: textViewWidth, height: textViewHeight)
    let textView = UITextView(frame: textViewFrame)
    
    textView.text =  "    我们的生活几乎离不号码，如电话号码、手机号码、车牌号码、门牌号码等等。号码为什么会影响一个人的运势？其实号码也包含有一定的吉凶数理，这就像姓名会影响运势命运的意义是一样的。"

效果:

---

加上几个常用属性

 //textView是否可编辑,是否可选中
        textView.allowsEditingTextAttributes = false
        textView.isSelectable = true
    //字体颜色,背景颜色,字体大小,字体对齐方式
    textView.textColor = UIColor.green
    textView.backgroundColor = UIColor.orange
    textView.font = UIFont.systemFont(ofSize: 12.0)
    textView.textAlignment = .center

效果:

---~~~~

改为富文本

// 创建可变属性字符串
        let attribute = NSMutableAttributedString(string: textView.text)
        // 设置段落样式
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.alignment = .center
        paragraphStyle.lineSpacing = 10
        // 设置属性字典
        let dic = [NSAttributedString.Key.foregroundColor: UIColor.red,
                   NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 22.0),
                   NSAttributedString.Key.paragraphStyle: paragraphStyle]
        // 添加属性字典
        attribute.addAttributes(dic, range: NSMakeRange(16, textView.text.count - 16))
        // 设置textView的attributedText
        textView.attributedText = attribute

效果:

---

设置文字与边框间距,显示边框

//设置文本内容与边框的间距
        textView.textContainerInset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)
    //显示边框
    textView.layer.borderColor = UIColor.cyan.cgColor
    textView.layer.borderWidth = 2.0

效果:

---

完整代码:

//: A UIKit based Playground for presenting user interface
import UIKit

import PlaygroundSupport
class MyViewController : UIViewController ,UITextViewDelegate{

override func loadView() {

let view = UIView()

view.backgroundColor = .white
    self.view = view
    
    //textView尺寸和位置
    let textViewWidth: CGFloat = 223
    let textViewHeight: CGFloat = 198
    let textViewTopView: CGFloat = 240
    let textViewFrame = CGRect(x: 22, y: textViewTopView, width: textViewWidth, height: textViewHeight)
    
    let textView = UITextView(frame: textViewFrame)
    
    textView.text =  "    我们的生活几乎离不号码，如电话号码、手机号码、车牌号码、门牌号码等等。号码为什么会影响一个人的运势？其实号码也包含有一定的吉凶数理，这就像姓名会影响运势命运的意义是一样的。"
    
    //textView是否可编辑,是否可选中
    textView.allowsEditingTextAttributes = false
    textView.isSelectable = true
    
    //字体颜色,背景颜色,字体大小,字体对齐方式
    textView.textColor = UIColor.green
    textView.backgroundColor = UIColor.orange
    textView.font = UIFont.systemFont(ofSize: 12.0)
    textView.textAlignment = .center
    
    
    // 创建可变属性字符串
    let attribute = NSMutableAttributedString(string: textView.text)
    // 设置段落样式
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.alignment = .center
    paragraphStyle.lineSpacing = 10
    // 设置属性字典
    let dic = [NSAttributedString.Key.foregroundColor: UIColor.red,
               NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 22.0),
               NSAttributedString.Key.paragraphStyle: paragraphStyle]
    // 添加属性字典
    attribute.addAttributes(dic, range: NSMakeRange(16, textView.text.count - 16))
    // 设置textView的attributedText
    textView.attributedText = attribute
    
    //设置文本内容与边框的间距
    textView.textContainerInset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)

    //显示边框
    textView.layer.borderColor = UIColor.cyan.cgColor
    textView.layer.borderWidth = 2.0
    
    textView.delegate = self//将ViewController当前对象赋值给TextView控件的delegate委托属性
    view.addSubview(textView)

}

}

// Present the view controller in the Live View window

PlaygroundPage.current.liveView = MyViewController()