swift 具有自动布局高度的ImageView

Posted 2021-05-19

class RationImageView: UIImageView {
  
  var estimatedSize: CGSize? {
    didSet {
      guard let estimatedSize = estimatedSize else { return }
      self.estimatedRatio = estimatedSize.width / estimatedSize.height
    }
  }
  private var estimatedRatio: CGFloat = 2.0
  
  override var intrinsicContentSize: CGSize  {
    guard let img = self.image else {
      
      let w = self.frame.width
      
      return CGSize(width: w, height: w / estimatedRatio )
    }
    
    let r = img.size.width / img.size.height
    
    return CGSize(width: self.frame.width, height: self.frame.width / r )
  }
}

func config(imgUrl: String, estimatedSize: CGSize?, description: NSAttributedString?) {
    postImageView.estimatedSize = estimatedSize
    postImageView.loadImg(fromUrl: imgUrl)
}