C＃Monotouch / Xamarin-UITableViewCell GetCell ImageView框架未调整大小

Question

摘要概述

我的UITableViewSource中具有以下重写GetCell。 一切正常，但我想缩小单元格左侧的图像，而不必调整其大小。 从本质上讲，我只是想减少框架的大小，（30宽x 30高度）。

问题

仅仅将新的RectangleF应用于ImageView的Frame属性似乎不起作用。

 if (tableItems[indexPath.Section].Items[indexPath.Row].ImageName != null)
                                {
//RESIZE IMAGE VIEW
cell.ImageView.Frame = new RectangleF(5,5,30,30);
                                        Console.WriteLine("Image name: " + tableItems[indexPath.Section].Items[indexPath.Row].ImageName);
                                        cell.ImageView.Image = UIImage.FromFile (tableItems[indexPath.Section].Items[indexPath.Row].Image); 
                                }

码

 public override UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
            {
                    UITableViewCell cell = tableView.DequeueReusableCell (cellIdentifier);
                    Custom_UITableItem item = tableItems[indexPath.Section].Items[indexPath.Row];
                    var cellStyle = UITableViewCellStyle.Subtitle;

                    // if there are no cells to reuse, create a new one
                    if (cell == null) 
                    {
                            cell = new UITableViewCell (cellStyle, cellIdentifier);
                    }

                    try
                    {
                            if(cellAccessoryButtons.Count > 0)
                            {
                                    var cellAccessoryButton = cellAccessoryButtons [indexPath.Row];
                                    cell.AccessoryView = cellAccessoryButton;
                            }

                            cell.TextLabel.Text = tableItems[indexPath.Section].Items[indexPath.Row].Heading;
                            cell.TextLabel.Font = AppSettings.CellDetailTextLabelFontSize;
                            cell.TextLabel.LineBreakMode = UILineBreakMode.WordWrap;
                            cell.TextLabel.Lines = 2;
                            cell.DetailTextLabel.Text = tableItems[indexPath.Section].Items[indexPath.Row].SubHeading;
                            cell.DetailTextLabel.Font = AppSettings.CellDetailTextLabelFontSize;
                            cell.DetailTextLabel.LineBreakMode = UILineBreakMode.WordWrap;
                            cell.DetailTextLabel.Lines = 2;

                            if (tableItems[indexPath.Section].Items[indexPath.Row].ImageName != null)
                            {
//RESIZE IMAGE VIEW
cell.ImageView.Frame = new RectangleF(5,5,30,30);

                                    Console.WriteLine("Image name: " + tableItems[indexPath.Section].Items[indexPath.Row].ImageName);
                                    cell.ImageView.Image = UIImage.FromFile (tableItems[indexPath.Section].Items[indexPath.Row].Image); 
                            }

                            var trackUploadedDateFrame = new RectangleF (87, 55, 100, 20);
                            var trackUploadedDate = new UILabel (trackUploadedDateFrame);
                            trackUploadedDate.BackgroundColor = UIColor.Clear;
                            trackUploadedDate.Font = AppSettings.TrackUploadedDateFontSize;
                            trackUploadedDate.TextAlignment = UITextAlignment.Left;
                            trackUploadedDate.Text = "Uploaded: 16/10/13";
                            cell.AddSubview (trackUploadedDate);

                    }
                    catch(Exception ex) 
                    {
                            Console.WriteLine (ex.ToString ());
                    }

                    return cell;
            } 

Answer 1

简而言之，“到那儿做完”，然后让我告诉您自定义股票UITableViewCell-尤其是ImageView是一种痛苦。

根据我的经验，除非将UITableViewCell的功能非常接近于您自己的目标，否则可以通过使用IB在Code或.xib中将UITableViewCell子类化来更轻松地实现您的设计目标。

Answer 2

使用以下功能调整图像大小，然后将其设置为表格单元格图像视图

 public UIImage ResizeImage(UIImage sourceImage, float width, float height)
        {
            UIGraphics.BeginImageContext(new SizeF(width, height));
            sourceImage.Draw(new RectangleF(0, 0, width, height));
            var resultImage = UIGraphics.GetImageFromCurrentImageContext();
            UIGraphics.EndImageContext();
            return resultImage;
        }