iOS開發之TextView常用屬性

本文介紹iOS開發的TextView控件, swift代碼形式.

基本屬性:

//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 =  "    我們的生活幾乎離不號碼，如電話號碼、手機號碼、車牌號碼、門牌號碼等等。號碼為什么會影響一個人的運勢？其實號碼也包含有一定的吉凶數理，這就像姓名會影響運勢命運的意義是一樣的。"

效果:

---

加上幾個常用屬性

 //textView是否可編輯,是否可選中
        textView.allowsEditingTextAttributes = false
        textView.isSelectable = true
    //字體顏色,背景顏色,字體大小,字體對齊方式
    textView.textColor = UIColor.green
    textView.backgroundColor = UIColor.orange
    textView.font = UIFont.systemFont(ofSize: 12.0)
    textView.textAlignment = .center

效果:

---~~~~

改為富文本

// 創建可變屬性字符串
        let attribute = NSMutableAttributedString(string: textView.text)
        // 設置段落樣式
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.alignment = .center
        paragraphStyle.lineSpacing = 10
        // 設置屬性字典
        let dic = [NSAttributedString.Key.foregroundColor: UIColor.red,
                   NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 22.0),
                   NSAttributedString.Key.paragraphStyle: paragraphStyle]
        // 添加屬性字典
        attribute.addAttributes(dic, range: NSMakeRange(16, textView.text.count - 16))
        // 設置textView的attributedText
        textView.attributedText = attribute

效果:

---

設置文字與邊框間距,顯示邊框

//設置文本內容與邊框的間距
        textView.textContainerInset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)
    //顯示邊框
    textView.layer.borderColor = UIColor.cyan.cgColor
    textView.layer.borderWidth = 2.0

效果:

---

完整代碼:

//: 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 =  "    我們的生活幾乎離不號碼，如電話號碼、手機號碼、車牌號碼、門牌號碼等等。號碼為什么會影響一個人的運勢？其實號碼也包含有一定的吉凶數理，這就像姓名會影響運勢命運的意義是一樣的。"
    
    //textView是否可編輯,是否可選中
    textView.allowsEditingTextAttributes = false
    textView.isSelectable = true
    
    //字體顏色,背景顏色,字體大小,字體對齊方式
    textView.textColor = UIColor.green
    textView.backgroundColor = UIColor.orange
    textView.font = UIFont.systemFont(ofSize: 12.0)
    textView.textAlignment = .center
    
    
    // 創建可變屬性字符串
    let attribute = NSMutableAttributedString(string: textView.text)
    // 設置段落樣式
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.alignment = .center
    paragraphStyle.lineSpacing = 10
    // 設置屬性字典
    let dic = [NSAttributedString.Key.foregroundColor: UIColor.red,
               NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 22.0),
               NSAttributedString.Key.paragraphStyle: paragraphStyle]
    // 添加屬性字典
    attribute.addAttributes(dic, range: NSMakeRange(16, textView.text.count - 16))
    // 設置textView的attributedText
    textView.attributedText = attribute
    
    //設置文本內容與邊框的間距
    textView.textContainerInset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)

    //顯示邊框
    textView.layer.borderColor = UIColor.cyan.cgColor
    textView.layer.borderWidth = 2.0
    
    textView.delegate = self//將ViewController當前對象賦值給TextView控件的delegate委托屬性
    view.addSubview(textView)

}

}
 // Present the view controller in the Live View window
 PlaygroundPage.current.liveView = MyViewController()