创建多个片段以匹配 ViewModel 中的对象数量 [英] Create a number of fragments to match number of objects in ViewModel

问题描述

我在viewmodel中有如下五个对象，我希望有相同数量的片段.目前，我已经用五个片段进行了硬编码.

I have five objects as follows in the viewmodel, and I want to have the same number of fragments. At the moment, I have hardcoded with five fragments.

有没有办法从视图模型中获取对象的数量并将其传递给视图以使其模块化而不是硬编码.我正在使用 mvvm 模式.

Is there a way to get the number of objects from the viewmodel and pass it to the view to make it modular rather than hard coded. I am using mvvm pattern.

ViewModel 类

public RecyclerViewModel()
 {
    Items = new ObservableCollection<ListItem> {
        new ListItem { Title = "A" },
        new ListItem { Title = "B" },
        new ListItem { Title = "C" },
        new ListItem { Title = "D" },
        new ListItem { Title = "E" }
    };
 }

查看类

var viewPager = view.FindViewById<ViewPager>(Resource.Id.viewpager);
if (viewPager != null)
 {
    var fragments = new List<MvxFragmentPagerAdapter.FragmentInfo>
    {
      // hard coded
      new MvxFragmentPagerAdapter.FragmentInfo("RecyclerView 1", typeof (RecyclerViewFragment),typeof (RecyclerViewModel)),
      new MvxFragmentPagerAdapter.FragmentInfo("RecyclerView 2", typeof (RecyclerViewFragment),typeof (RecyclerViewModel)),
      new MvxFragmentPagerAdapter.FragmentInfo("RecyclerView 3", typeof (RecyclerViewFragment),typeof (RecyclerViewModel)),
      new MvxFragmentPagerAdapter.FragmentInfo("RecyclerView 4", typeof (RecyclerViewFragment),typeof (RecyclerViewModel)),
      new MvxFragmentPagerAdapter.FragmentInfo("RecyclerView 5", typeof (RecyclerViewFragment), typeof (RecyclerViewModel))
     };
   viewPager.Adapter = new MvxFragmentPagerAdapter(Activity, ChildFragmentManager, fragments);
 }

推荐答案

public static class StaticClass
{
    public static String[] a= {"A","B","C","D","E"};
    public static int index = 0;
}

所以在你的构造函数中:

so in your constructor:

Items = new ObservableCollection<ListItem> {
                new ListItem { StaticClass.a[StaticClass.index < StaticClass.a.Length ? StaticClass.Index : StaticClass.a.Length -1] }
            };
StaticClass.Index++;

和:

var fragments = new List<MvxFragmentPagerAdapter.FragmentInfo>();

    for(int i = 0; i < StaticClass.a.Length; i++
         {
          fragments.add(
          new MvxFragmentPagerAdapter.FragmentInfo("RecyclerView " + (i+1).ToString(), typeof (RecyclerViewFragment),typeof (RecyclerViewModel));
         }
    viewPager.Adapter = new MvxFragmentPagerAdapter(Activity, ChildFragmentManager, fragments);

就像我之前说的比赛调节可能会导致问题，但请测试一下:)

Like i said before race conditioning could cause a problem but test it out :)

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