如何在文本视图中调整 UIImageView 的大小，如 Scale Aspect Fit swift？答案

【问题标题】：How to resized scale UIImageView in textview like Scale Aspect Fit swift?如何在文本视图中调整 UIImageView 的大小，如 Scale Aspect Fit swift？
【发布时间】：2020-06-17 11:17:02
【问题描述】：

嘿，我创建了一个 textview，我可以在这个 textview 中添加图像。这个图像的宽度等于 textview 的宽度。但我想为这个 ImageView 提供一个最大高度，我想显示图像，如内容模式缩放方面适合，但它显示拉伸（压缩方面填充）我该如何解决这种情况？如下代码

  let image = UIImageView()
  image.contentMode = .scaleAspectFit
  let imageAttachment = NSTextAttachment()
  let newImageWidth = self.textView.bounds.width
  let newImageHeight = 200
  imageAttachment.bounds = CGRect(x: 0, y: 0, width: Int(newImageWidth), height: newImageHeight)
  imageAttachment.image = image.image

【问题讨论】：

标签： swift uiimageview uitextview aspect-ratio nstextattachment

【解决方案1】：

这是计算aspectFit 比率的新高度的方法：

    // don't use "image" ... that's confusing
    let imageView = UIImageView()

    // assuming you set the image here
    imageView.image = UIImage(named: "myImage")

    guard let imgSize = imageView.image?.size else {
        // this will happen if you haven't set the image of the imageView
        fatalError("Could not get size of image!")
    }

    let imageAttachment = NSTextAttachment()
    let newWidth = self.textView.bounds.width

    // get the scale of the difference in width
    let scale = newWidth / imgSize.width

    // multiply image height by scale to get aspectFit height
    let newHeight = imgSize.height * scale

    imageAttachment.bounds = CGRect(x: 0, y: 0, width: newWidth, height: newHeight)
    imageAttachment.image = imageView.image

【讨论】：