C# UISearchController和MvvmCross

我想为我的应用程序IOS8添加搜索逻辑。我有简单的MvxTableViewController，并通过UITableViewSource显示我的数据。这是： …控制器：

    MvxViewFor(typeof(MainViewModel))]
    partial class MainController : MvxTableViewController
    {
        public MainController(IntPtr handle) : base(handle) { }


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


            // make background trasnsparent page 
            this.View.BackgroundColor = UIColor.Clear;
            this.TableView.BackgroundColor = UIColor.Clear;
            this.NavigationController.NavigationBar.BarStyle = UIBarStyle.Black;

            this.SetBackground ();

           (this.DataContext as MainViewModel).PropertyChanged += this.ViewModelPropertyChanged;
        }

        private void SetBackground()
        {
            // set blured bg image

        }

        private void ViewModelPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            var viewModel = this.ViewModel as MainViewModel;
            if (e.PropertyName == "Title")
            {
                this.Title = viewModel.Title;
            }
            else if (e.PropertyName == "Topics")
            {
                var tableSource = new TopicTableViewSource(viewModel.Topics);
                tableSource.TappedCommand = viewModel.NavigateToChildrenPageCommand;

                this.TableView.Source = tableSource;
                this.TableView.ReloadData();
            }
        }

this.searchController = new UISearchController (this.searchTableController) 
{
       WeakDelegate = this,
       DimsBackgroundDuringPresentation = false,
       WeakSearchResultsUpdater = this,
};

this.searchController.SearchBar.SizeToFit ();
this.TableView.TableHeaderView = searchController.SearchBar;

this.TableView.WeakDelegate = this;
this.searchController.SearchBar.WeakDelegate = this;

我阅读了有关在IOS中搜索的内容，并为IOS8应用程序选择了UISearchController。但我不明白如何将此控制器添加到我的视图中： 我从Xamarin表搜索中找到了一个样本，但他们不使用UITableViewSource，我也不明白该怎么做。 我尝试添加控制器：

    MvxViewFor(typeof(MainViewModel))]
    partial class MainController : MvxTableViewController
    {
        public MainController(IntPtr handle) : base(handle) { }


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


            // make background trasnsparent page 
            this.View.BackgroundColor = UIColor.Clear;
            this.TableView.BackgroundColor = UIColor.Clear;
            this.NavigationController.NavigationBar.BarStyle = UIBarStyle.Black;

            this.SetBackground ();

           (this.DataContext as MainViewModel).PropertyChanged += this.ViewModelPropertyChanged;
        }

        private void SetBackground()
        {
            // set blured bg image

        }

        private void ViewModelPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            var viewModel = this.ViewModel as MainViewModel;
            if (e.PropertyName == "Title")
            {
                this.Title = viewModel.Title;
            }
            else if (e.PropertyName == "Topics")
            {
                var tableSource = new TopicTableViewSource(viewModel.Topics);
                tableSource.TappedCommand = viewModel.NavigateToChildrenPageCommand;

                this.TableView.Source = tableSource;
                this.TableView.ReloadData();
            }
        }

this.searchController = new UISearchController (this.searchTableController) 
{
       WeakDelegate = this,
       DimsBackgroundDuringPresentation = false,
       WeakSearchResultsUpdater = this,
};

this.searchController.SearchBar.SizeToFit ();
this.TableView.TableHeaderView = searchController.SearchBar;

this.TableView.WeakDelegate = this;
this.searchController.SearchBar.WeakDelegate = this;

---

在这个.searchTableController中我应该做什么？是否需要将显示逻辑移到那里？

是。searchTableController应负责显示搜索结果

searchController管理搜索栏和searchResultPresenter。His不需要添加到运营商控制器的视图层次结构中。当用户开始在搜索栏中键入文本时，SearchController会自动为您显示SearchResultPresenter

步骤： 1使用SearchResultsPresenterController实例化搜索控制器

2当用户在搜索栏中输入文本时，您应该调用自己的服务进行搜索。下面是一个代码示例

#pragma mark - UISearchResultsUpdating

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController
{
    NSString *searchString = searchController.searchBar.text;

    if (searchString.length > 1)
    {
        // TODO - call your service for the search by string
        // this may be async or sync
        // When a data was found - set it to presenter
        [self.searchResultPresenter dataFound:<found data>];
    }
}

---

下面是关于如何将UISearchController与Xamarin.iOS一起使用的一些建议

为结果表视图子类UITableViewSource创建一个新类。这将是负责显示结果的视图。您需要将该表视图的项目列表公开

在我看来，根据用户体验将搜索栏添加到UI的最佳方法是将其作为NavigationItem添加到NavigationBarController

添加在主UIViewController中执行搜索的方法：

    MvxViewFor(typeof(MainViewModel))]
    partial class MainController : MvxTableViewController
    {
        public MainController(IntPtr handle) : base(handle) { }


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


            // make background trasnsparent page 
            this.View.BackgroundColor = UIColor.Clear;
            this.TableView.BackgroundColor = UIColor.Clear;
            this.NavigationController.NavigationBar.BarStyle = UIBarStyle.Black;

            this.SetBackground ();

           (this.DataContext as MainViewModel).PropertyChanged += this.ViewModelPropertyChanged;
        }

        private void SetBackground()
        {
            // set blured bg image

        }

        private void ViewModelPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            var viewModel = this.ViewModel as MainViewModel;
            if (e.PropertyName == "Title")
            {
                this.Title = viewModel.Title;
            }
            else if (e.PropertyName == "Topics")
            {
                var tableSource = new TopicTableViewSource(viewModel.Topics);
                tableSource.TappedCommand = viewModel.NavigateToChildrenPageCommand;

                this.TableView.Source = tableSource;
                this.TableView.ReloadData();
            }
        }

this.searchController = new UISearchController (this.searchTableController) 
{
       WeakDelegate = this,
       DimsBackgroundDuringPresentation = false,
       WeakSearchResultsUpdater = this,
};

this.searchController.SearchBar.SizeToFit ();
this.TableView.TableHeaderView = searchController.SearchBar;

this.TableView.WeakDelegate = this;
this.searchController.SearchBar.WeakDelegate = this;

---

我真的希望这对你有帮助，祝你好运。

谢谢。我看到了这个样本，它是xamarin samle的类比。但在这些示例中，未使用UITableViewSource。“我不明白，我该如何组合，我该如何编辑我的逻辑以进行正确的搜索工作。”NikitaBondarenko补充了我理解的解释。我需要创建新的TableViewController来显示搜索结果。它应该是带有项目列表的简单控制器，并覆盖显示RowsIsSection和GetCell等的默认方法，或者使用更新此源的方法覆盖youself-UITableViewSource。谢谢，我明白了。我需要创建新的TableViewController来显示搜索结果。它应该是带有项目列表的简单控制器，并覆盖显示RowsIsSection和GetCell等的默认方法，或者使用更新此源的方法覆盖youself-UITableViewSource。谢谢，没错。注意：UITableViewSource只是一个结合了UITableViewDataSource和UITableViewDelegate的助手。

[Export ("updateSearchResultsForSearchController:")]
public virtual void UpdateSearchResultsForSearchController (UISearchController searchController)
{
    var tableController = (UITableViewController)searchController.SearchResultsController;
    var resultsSource = (ResultsTableSource)tableController.TableView.Source;
    resultsSource.SearchedItems = PerformSearch (searchController.SearchBar.Text);
    tableController.TableView.ReloadData ();
}

static List<string> PerformSearch (string searchString)
{
    // Return a list of elements that correspond to the search or
    // parse an existing list.
}