我尝试根据从Firebase数据库下载的图像并将其显示在表格视图单元中来动态调整图像大小。我希望图像的宽度为框架宽度,并相应调整高度。
我有一个customImageView类可以从Firebase异步下载图像
我尝试了许多方法,但徒劳无功。有没有超级干净的方法来动态调整图像大小:-D
这是我的手机:
class viewControllerHomeCell: UITableViewCell {
@IBOutlet var mainImage: CstmImageView!
}
我的单元格在:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellData = TableViewControllerHome.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! viewControllerHomeCell
cellData.mainImage.loadImagesWithUrl(from: self.postArray[indexPath.row].covrImgUrl)
}
这是一个UIImageView子类,用于从Firebase异步加载图像。:
class CstmImageView : UIImageView {
let imageCache = NSCache<AnyObject, AnyObject>()
var imageUrlString : String?
func loadImagesWithUrl(from imageUrl : String!) {
imageUrlString = imageUrl
self.image = nil
if let cachedImage = imageCache.object(forKey: imageUrl as AnyObject) as? UIImage {
self.image = cachedImage
return
}
let url = URLRequest(url: URL(string: imageUrl)!)
URLSession.shared.dataTask(with: url) { (data, response, eror) in
if eror != nil {
print(eror!)
return
}
DispatchQueue.main.async {
if let downloadedImage = UIImage(data : data!) {
if self.imageUrlString == imageUrl {
self.image = downloadedImage
}
self.imageCache.setObject(downloadedImage, forKey: imageUrl as AnyObject)
}
}
}.resume()
}
}
非常感谢任何帮助:)
拿起imageView Height Outlet并连接imageView height约束
class viewControllerHomeCell: UITableViewCell {
@IBOutlet var mainImage: UIImageView!
@IBOutlet var viewImageViewHeight: NSLayoutConstraint!
}
并使用Pod下载图像
在“ SDWebImage”下
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cellData = TableViewControllerHome.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! viewControllerHomeCell
cellData.mainImage.sd_setImage(with:URL.init(string: "Pass Yor image Url string here"))
{ (image, error, imageCacheType, url) in
cellData.mainImage.image = image
viewImageViewHeight.constant = image?.size.height
}
cellData.mainImage.loadImagesWithUrl(from: self.postArray[indexPath.row].covrImgUrl)
}
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