如何调整图像大小以适应 tableview 单元格中的 UIImageview

how to resize the image to fit in UIImageview in a tableview cell

我正在从用户那里获取标题、描述和产品照片等数据,并将其显示在帖子页面上。我得到图像,将 url 下载到 firebase,然后使用 url session 再次获取它,这是我获取图像的代码:

class ImageService {

    static let cache = NSCache<NSString, UIImage>()

    static func downloadImage(withURL url:URL, completion: @escaping (_ image:UIImage?)->()) {
        let dataTask = URLSession.shared.dataTask(with: url) { data, responseURL, error in
            var downloadedImage:UIImage?

            if let data = data {
                downloadedImage = UIImage(data: data)
            }

            if downloadedImage != nil {
                cache.setObject(downloadedImage!, forKey: url.absoluteString as NSString)
            }

            DispatchQueue.main.async {
                completion(downloadedImage)
            }

        }

        dataTask.resume()
    }

    static func getImage(withURL url:URL, completion: @escaping (_ image:UIImage?)->()) {
        if let image = cache.object(forKey: url.absoluteString as NSString) {
            completion(image)
        } else {
            downloadImage(withURL: url, completion: completion)
        }
    }

,这是我设置此数据的代码:

func set(post:Post) {
    ImageService.getImage(withURL: post.imageid) { (image) in

        self.postimage.image = image
    }
    titlel.text = post.title
    usernamel.text = post.username
    desct.text = post.desc
}

,当应用程序为 运行:no good, and nogood2. also, here is a photo of my cell and they all have constraints so I don't think the problem is in this cell but still 时,我的帖子看起来像这样。我只是希望用户将图像视为正方形的普通图片,而不是像这样看起来又高又瘦。

将图像视图内容模式设置为纵横比填充和剪辑以将 属性 绑定为 true。

self.postimage.contentMode = .scaleAspectFill
self.postimage.clipsToBounds = true

使用self.postimage.contentmode.scaleaspectfit

在您的屏幕截图中,我可以看到您没有提供高度限制,这就是图像很高的原因。要显示正方形图片,只需在 UIImageView

上提供宽度和高度约束