Monotouch 自定义 UITableViewCell GetCell 不初始化新的自定义视图单元格 [英] Monotouch custom UITableViewCell GetCell not initialising new custom view cells

问题描述

我一直在学习许多教程，以使用故事板为原型表视图组合自定义表视图单元格.

I've been foloowing a number of tutorials to put together a custom table view cell using storyboard for a prototype table view.

我是 monotouch 的新手，并设法为标准细胞类型找到了一个有效的解决方案.遇到自定义视图单元格的问题，因为我无法以正确的方式初始化新单元格.一些旧教程似乎加载了一个单元格 nib 文件，但我正在使用带有以下代码的故事板.

I'm new to monotouch and managed to get a working solution for standard cell types. Running into issues with custom view cells as I'm unable to initialise a fresh cell in the correct manner. Some old tutorials appear to load a cell nib file but I'm using storyboard with the below code.

我哪里出错了?

(我会使用单点触控对话框，但我想不出一种方法来以简单的方式在配件等上添加可爱的 uipickerviews).

(I would use monotouch dialog but not couldn't figure out a way to add lovely uipickerviews on accessory, etc in a simple manner).

http://docs.xamarin.com/guides/ios/user_interface/tables/part_5_-_using_xcode%2C_interface_builder%2C_and_storyboards

public override UITableViewCell GetCell (UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath)
{
    // in a Storyboard, Dequeue will ALWAYS return a cell
    //*** above comment doesnt seem to hold for custom uitableview cells
    UITableViewCell cell = tableView.DequeueReusableCell (cellIdentifier);
    // now set the properties as normal
    cell.TextLabel.Text = tableItems[indexPath.Row].Name;
    if (tableItems[indexPath.Row].Done) 
        cell.Accessory = UITableViewCellAccessory.Checkmark;
    else
        cell.Accessory = UITableViewCellAccessory.None;
    return cell;
}


// here's my implementation of GetCell but problem is that I can't seem to generate a new cell
public override UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
{
        _cellIdentifier = "SingleTimeViewCell";
        CustomViewCell cell = tableView.DequeueReusableCell (_cellIdentifier) as 

//      if (cell == null)
//      {
//          cell = new SingleTimeViewCell();
//      }

         cell.myCustomProperty = "hello";
         return cell;
}

// here's the auto generated CustomViewCell class from Xcode storyboard
public partial class CustomViewCell : UITableViewCell
{
    public CustomViewCell () : base()  // I added this ctor but it didnt seem to help matters
    {
    }

    public CustomViewCell (IntPtr handle) : base (handle)
    { 
    }

}

推荐答案

只能使用带有原型单元格的故事板来完成，请参阅 此示例来自 Xamarin 论坛.

It can be done using only storyboards with prototype cells, see this sample from Xamarin forums.

这是相关代码(感谢 Stephane Cordonnier):

Here is the relevant code (credit to Stephane Cordonnier):

public partial class CustomCellStoryBoardViewController : UIViewController
{
    public CustomCellStoryBoardViewController(IntPtr handle) : base (handle)
    {
    }

    public override void DidReceiveMemoryWarning()
    {
        base.DidReceiveMemoryWarning();
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        this.MyTableView.DataSource = new MyDataSource();
    }

    private class MyDataSource : UITableViewDataSource
    {
        private String[] items = {"Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };

        public MyDataSource()
        {
        }

        public override int RowsInSection(UITableView tableView, int section)
        {
            return this.items.Length;
        }

        public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
        {
            MyCustomCell cell = (MyCustomCell)tableView.DequeueReusableCell(MyCustomCell.Key);
            cell.SetTitle(this.items[indexPath.Row]);
            return cell;
        }
    }
}

自定义单元格:

[Register ("MyCustomCell")]
public class MyCustomCell : UITableViewCell
{
    [Outlet]
    MonoTouch.UIKit.UILabel TitleLabel { get; set; }

    public static readonly NSString Key = new NSString("MyCustomCell");

    public MyCustomCell(IntPtr handle) : base(handle)
    {
    }

    public void SetTitle(String title)
    {
        this.TitleLabel.Text = title;
    }
}

确保您已将自定义单元类和标识符设置为故事板中单元类的名称.

Make sure you have set the custom cell class and identifier to the name of your cell class in the storyboard.

这篇关于Monotouch 自定义 UITableViewCell GetCell 不初始化新的自定义视图单元格的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！