CollectionViewCells 不显示任何数据。

huangapple
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英文:

CollectionViewCells do not display any data

问题

这是您提供的代码的翻译部分：

  1. 我在项目的另一个区域成功地使用了CollectionViews，并且没有任何问题，但是这个地方无论我怎么做，它都不会在单元格中显示数据。我可以看到单元格的边框，它的宽度和高度是正确的，当我逐步执行代码时，我看到数据被分配到单元格中的标签上。我看到了与源中的字符串列表相对应的正确数量的单元格，但没有显示任何内容。我无法弄清楚为什么。有人看到我的代码有什么问题吗？这应该很简单，但我已经做了3天了，没有结果。
  3. 我的单元格代码：
  5. public partial class PhoneNumberCell : UICollectionViewCell
  6. {
  7.     public static readonly NSString Key = new NSString("PhoneNumberCell");
  9.     UILabel lblPhoneNumberInfo = new UILabel();
  11.     [Export("initWithFrame:")]
  12.     public PhoneNumberCell(CGRect frame) : base(frame)
  13.     {
  14.         // 我设置了框架和文本颜色，因为在其他实例中，数据没有显示出来，这被证明是问题所在。
  15.         // 显然在这里不起作用，我删除这段代码后单元格中仍然没有文本。
  16.         lblPhoneNumberInfo.Frame = new CGRect(0,0,ContentView.Frame.Width, 26f);
  17.         lblPhoneNumberInfo.TextColor = UIColor.Black;
  18.         // 但我确实看到了单元格周围的边框。
  19.         ContentView.Layer.BorderColor = UIColor.LightGray.CGColor;
  20.         ContentView.Layer.BorderWidth = 2.0f;
  21.         ContentView.BackgroundColor = UIColor.White;
  22.         ContentView.Transform = CGAffineTransform.MakeScale(0.8f, 0.8f);
  23.     }
  25.     public void SetData(string pPhoneNumberInfo)
  26.     {
  27.         lblPhoneNumberInfo.Text = pPhoneNumberInfo;
  28.     }
  30.     protected PhoneNumberCell(IntPtr handle) : base(handle)
  31.     {
  32.         // 注意：此构造函数不应包含任何初始化逻辑。
  33.     }
  34. }

这段代码描述了您的单元格类，但是您的问题可能出现在其他地方。如果需要继续翻译其他部分，请提供详细信息。

英文:

I've used CollectionViews in my project in another area of my project successfully with no issues, but this one simply won't display the data in the cell no matter what I do. I can see the cell border, it is the correct width and height, and when I step through the code I see the data get assigned to the label in the cell. I see the correct number of cells for the list of strings that's in the source, just get nothing displayed. I cannot figure out why. Anyone see any problems with my code? This should be pretty simple, and I've been at it for 3 days now with no results.

My Cell Code:

  1. public partial class PhoneNumberCell : UICollectionViewCell
  2. {
  3.     public static readonly NSString Key = new NSString("PhoneNumberCell");
  5.     UILabel lblPhoneNumberInfo = new UILabel();
  7.     [Export("initWithFrame:")]
  8.     public PhoneNumberCell(CGRect frame) : base(frame)
  9.     {
  10.         // I set the frame and text color because in other instances 
  11.         // of data not showing up, that's proved to be the issue.
  12.         // Apparently not here, I remove this code and still no text in the cell.
  13.         lblPhoneNumberInfo.Frame = new CGRect(0,0,ContentView.Frame.Width, 26f);
  14.         lblPhoneNumberInfo.TextColor = UIColor.Black;
  15.         // I do see the border around the cell though.
  16.         ContentView.Layer.BorderColor = UIColor.LightGray.CGColor;
  17.         ContentView.Layer.BorderWidth = 2.0f;
  18.         ContentView.BackgroundColor = UIColor.White;
  19.         ContentView.Transform = CGAffineTransform.MakeScale(0.8f, 0.8f);
  20.     }
  22.     public void SetData(string pPhoneNumberInfo)
  23.     {
  24.         lblPhoneNumberInfo.Text = pPhoneNumberInfo;
  25.     }
  27.     protected PhoneNumberCell(IntPtr handle) : base(handle)
  28.     {
  29.         // Note: this .ctor should not contain any initialization logic.
  30.     }
  31. }

The XIB:

  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  2. <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
  3.   <dependencies>
  4.     <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7026.1" />
  5.   </dependencies>
  6.   <objects>
  7.     <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" />
  8.     <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder" />
  9.     <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" customClass="PhoneNumberCell" id="cZE-iV-UFb">
  10.       <rect key="frame" x="0.0" y="0.0" width="50" height="50" />
  11.       <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES" />
  12.       <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
  13.         <rect key="frame" x="0.0" y="0.0" width="50" height="50" />
  14.         <autoresizingMask key="autoresizingMask" />
  15.         <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite" />
  16.       </view>
  17.     </collectionViewCell>
  18.   </objects>
  19. </document>

The Source:

  1. public class PhoneNumberSource : UICollectionViewSource
  2. {
  3.     public IList<string> PhoneNumbers;
  4.     public override nint NumberOfSections(UICollectionView collectionView)
  5.     {
  6.         return 1;
  7.     }
  8.     public override nint GetItemsCount(UICollectionView collectionView, nint section)
  9.     {
  10.         return PhoneNumbers.Count;
  11.     }
  13.     public PhoneNumberSource(IList<string> pPhoneNumbers)
  14.     {
  15.         PhoneNumbers = pPhoneNumbers;
  16.     }
  17.     public override UICollectionViewCell GetCell(UICollectionView collectionView, NSIndexPath indexPath)
  18.     {
  19.         var phoneNumberCell = (PhoneNumberCell)collectionView.DequeueReusableCell(PhoneNumberCell.Key, indexPath);
  20.         string phoneinfo = PhoneNumbers[indexPath.Row];
  21.         phoneNumberCell.SetData(phoneinfo);
  22.         return phoneNumberCell;
  23.     }
  24. }

My CollectionView layout:

  1.     PhoneNumberList.CollectionViewLayout = new UICollectionViewFlowLayout()
  2.     {
  3.         ItemSize = new CGSize((float)UIScreen.MainScreen.Bounds.Size.Width, 26f),
  4.         HeaderReferenceSize = new CGSize(25, 25),
  5.         SectionInset = new UIEdgeInsets(0, 0, 0, 0),
  6.         ScrollDirection = UICollectionViewScrollDirection.Vertical,
  7.         MinimumInteritemSpacing = 0, // minimum spacing between cells
  8.         MinimumLineSpacing = 0,
  9.     };

答案1

得分: 0

解决方案是您需要像下面这样为ContentView添加AddSubview：

  1. ContentView.AddSubview(lblPhoneNumberInfo);
英文:

The solution is that you need to AddSubview for the ContentView like below:

  1. ContentView.AddSubview(lblPhoneNumberInfo);

huangapple
  • 本文由 发表于 2023年6月16日 01:50:13
  • 转载请务必保留本文链接：https://go.coder-hub.com/76484295.html
  • c#
  • uicollectionview
  • uicollectionviewcell
  • visual-studio-2022
  • xamarin.ios
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