如何创建带有Read More/Read Less的段落（标签中）？

-1

我想在最后创建带有Read More/Read Less的段落（标签中）。我是iPhone应用程序开发的初学者。如何创建带有Read More/Read Less的段落（标签中）？

这是我的代码... 我得到在其他条件一个错误，错误是“类型NSLayoutConstraint价值”没有成员“字体””在lbl.contant =的getHeight ....

@IBOutlet weak var lbl: NSLayoutConstraint! 

@IBOutlet weak var btn: UIButton!   

var isLabelAtMaxHeight = false 

@IBAction func ButtonAction(_ sender: Any) { 
    if isLabelAtMaxHeight { 
     btn.setTitle("Read more", for: .normal) 
     isLabelAtMaxHeight = false 
     lbl.constant = 70 
    } 
    else { 
     btn.setTitle("Read less", for: .normal) 
     isLabelAtMaxHeight = true 
     lbl.constant = getHeightOfLabel(text:"Isn't it? How to do? I'm sorry I don't know how to solve this exactly. :(– May Phyu Feb 20 at 11:16 No, i dont mean like that. When you set text to label then U have to find height of label then assign that height to label with setting property number of lines = 0 – Jitendra Modi Feb 20 at 11:31" , width: 
      view.bounds.width, font: lbl.font) 
    } 
} 



func getHeightOfLabel(text: String, width: CGFloat, font: UIFont) -> CGFloat 
{ 
    let lbl = UILabel(frame: .zero) 
    lbl.frame.size.width = width 
    lbl.font = font 
    lbl.numberOfLines = 0 
    lbl.text = text 
    lbl.sizeToFit() 
    return lbl.frame.size.height 
}

来源

2017-11-18 Shaik.Sahilpasha

的

@IBOutlet weak var btn: UIButton! @IBOutlet weak var yourParagraphLabel: UILabel! @IBOutlet weak var lblHeight: NSLayoutConstraint! var isLabelAtMaxHeight = false @IBAction func btnAction(_ sender: Any) { if isLabelAtMaxHeight { btn.setTitle("Read more", for: .normal) isLabelAtMaxHeight = false lblHeight.constant = 70 } else { btn.setTitle("Read less", for: .normal) isLabelAtMaxHeight = true lblHeight.constant = getHeightOfLabel(text: yourParagraphText, width: view.bounds.width, font: yourParagraphLabel.font) } }

获取高度这是过于宽泛，unresearched的堆栈溢出的问题，很遗憾。你会编辑它来显示你已经尝试过什么，以及你有什么具体问题？ – halfer

@ Shaik.Sahilpasha字体：lbl.font是你的错误。在这里给你的标签名称 –

lbl是标签名称...... –

为您paragraphLabel的高度约束的出口。你的 “更多” 按钮paragraphLabel。

机顶布局0

点击“Read more”按钮增加高度约束常数，点击“Read less”降低高度约束常数。文本

func getHeightOfLabel(text: String, width: CGFloat, font: UIFont) -> CGFloat 
{ 
    let lbl = UILabel(frame: .zero) 
    lbl.frame.size.width = width 
    lbl.font = font 
    lbl.numberOfLines = 0 
    lbl.text = text 
    lbl.sizeToFit() 
    return lbl.frame.size.height 
}

来源

2017-11-18 12:24:34

一旦检查出我的代码我在ButtonAction其他条件得到一个错误.... –

你能解释更多关于你的代码吗？哪一个是你的段落标签IBoutlet和哪一个你已经采用heightConstraint IBoutlet –

我想你还没有申报IBOutlet UILabel。您只声明了标签高度限制。 –

如何创建带有Read More/Read Less的段落（标签中）？

回答

相关问题