Xamarin.Android在无限加载的MVVMCross加载器中滑动刷新

Question

我的代码是

.AXML文件

<MvvmCross.Droid.Support.V4.MvxSwipeRefreshLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    local:MvxBind="Refreshing IsBusy;RefreshCommand RefreshCommand">

我的观点模型

       private MvxCommand refreshCommand;
       public ICommand RefreshCommand
        {
            get
            {
                return refreshCommand ?? (refreshCommand = new MvxCommand(ExecuteRefreshCommand));
            }
        }

        private bool m_IsBusy;

        public new bool IsBusy
        {
            get { return m_IsBusy; }
            set
            {
                m_IsBusy = value; RaisePropertyChanged(() => IsBusy);
                BaseMessage = m_IsBusy ? "Refreshing..." : string.Empty;
            }
        }

        async private void ExecuteRefreshCommand()
        {
          await Task.Run(() => { m_IsBusy = false; });
        }

我能够看到加载器，加载器无限加载，但无法停止刷卡刷新加载器。

Answer 1

看看code的MvxSwipeRefreshLayout你可以看到它继承自SwipeRefreshLayout。 SwipeRefreshLayout包含一个布尔Refreshing。这表明它正在加载，因此应显示加载图标。将此设置为false将隐藏动画。

您可以通过绑定它来完成此操作。在ViewModel中创建一个额外的属性，例如isRefreshing，如：

private bool _isRefreshing;
public bool IsRefreshing
{
    get { return _isRefreshing; }
    set
    {
        _isRefreshing = value;
        RaisePropertyChanged(() => IsRefreshing);
    }
}

现在在你的视图中绑定实际绑定两个像：

<MvxSwipeRefreshLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    local:MvxBind="Refreshing IsRefreshing; RefreshCommand RefreshCommand">

现在，您必须在“刷新工作”完成后手动将布尔值设置为false。例如：

public IMvxCommand RefreshCommand
{
    get
    {
        return new MvxCommand(async () => {

            // This simulates some refresh work which takes 3 seconds
            await Task.Delay(3000);
            IsRefreshing = false;
        });
    }
}