Umgang mit touch-Ereignissen innerhalb von ein Kind UIScrollView

Ich zu tun hatte ein ähnliches setup, aber ich im Grunde benutzerdefinierte schrieb, die ganze Sache. Ich bin mir nicht sicher, wie Sie gehen zu bekommen, um das problem der 'übergabe' touch-Ereignisse aus dem Kind UIScrollView zu den übergeordneten UISscrollView wenn Sie erreichen den Rand. Sie könnten versuchen, überschreiben UITouchesBegan:withEvent: in Ihrem übergeordneten UIScrollView und dumping direkt an das Kind. Viel Glück!

InformationsquelleAutor Ben Gottlieb

Dies ist das Andrej ' s code mit c# übersetzung für monotouch-Entwicklern...
Zuerst müssen Sie zum Bearbeiten Ihrer xib-Datei Einfügen.. 3 view-Controller und stellen Sie outlets wie _page1, _page2, _mainpage.. und verknüpfen diese Steckdosen mit Aussicht. Hinweis: Sie müssen die Referenz auf view-controller view-Steckdose mit _mainpage anzeigen. (sorry für mein Englisch)

    public partial class Test_Details_Controller : UIViewController
{
    private UIPageControl _pageCont;

    private UIScrollView _scView;
    private Object[] _pageViews;
    private int _currentPageIndex;        
    private bool _rotationInProgress;


    void InitializeAfterLoad ()
    { 

        this.Title = "Test";

        this._pageCont = CreatePageControll();

    }

    private UIPageControl CreatePageControll()
    {
        UIPageControl pageControll = new UIPageControl( new RectangleF( 146,348, 38, 20 ) );
        pageControll.BackgroundColor = UIColor.Red;
        pageControll.Alpha = 0.7f;

        return pageControll;
    }

    private void UpdatePageControll(UIPageControl cont, int current, int pages, UIView showed)
    {
        cont.CurrentPage = current;
        cont.Pages = pages;
        cont.UpdateCurrentPageDisplay();

        UIPageControl.AnimationsEnabled = true;
        UIPageControl.BeginAnimations(string.Empty, this.Handle);
        cont.Frame = new RectangleF(showed.Frame.Location.X 
                                        , cont.Frame.Location.Y , pageSize().Width, cont.Frame.Height);         
        UIPageControl.CommitAnimations();

    }

    private UIView loadViewForPage(int pageIndex){
        UIView _view = null;
        switch ( pageIndex ) {
        case 1:
            _view = this._page1;
        break;
        case 2:
            _view = this._page2;
        break;
        default:
            _view = this._page1;
        break;
        }
        return _view;
    }

    private int numberOfPages(){
        return (int)this._pageViews.Count();
    }

    private UIView viewForPage( int pageIndex ){
        UIView pageView;
        if(this._pageViews.ElementAt( pageIndex ) == null)
        {
            pageView = loadViewForPage( pageIndex );
            _pageViews[ pageIndex ] = pageView;
        }
        else{
            pageView = (UIView)_pageViews[ pageIndex ];
        }

        _scView.AddSubview( pageView );

        return pageView;                
    }

    private SizeF pageSize(){
        return this._scView.Frame.Size;
    }

    private bool isPageLoaded( int pageIndex ){
        return this._pageViews.ElementAt( pageIndex ) != null;
    }

    private void layoutPage( int pageIndex ){

        SizeF pageSize = this.pageSize();
        ((UIView)this._pageViews[pageIndex]).Frame = new RectangleF( pageIndex * pageSize.Width,0, pageSize.Width, pageSize.Height );
        this.viewForPage( pageIndex );  

    }

    private void loadView(){
        this._scView = new UIScrollView();
        this._scView.Delegate = new ScViewDelegate( this );
        this._scView.PagingEnabled = true;
        this._scView.ShowsHorizontalScrollIndicator = false;
        this._scView.ShowsVerticalScrollIndicator = false;
        this._scView.Layer.BorderWidth = 2;
        this._scView.AddSubview( _pageCont );
        this.View = this._scView;

    }

    public override void ViewDidLoad ()
    {
        base.ViewDidLoad ();
        InitializeAfterLoad ();
        this._pageViews = new Object[]{ _page1, _page2 };
        this.loadView();    
    }           

    private void currentPageIndexDidChange(){
        this.layoutPage( _currentPageIndex );

        if(_currentPageIndex+1 < this.numberOfPages()){
            this.layoutPage( _currentPageIndex + 1 );
        }
        if(_currentPageIndex >0){
            this.layoutPage( _currentPageIndex - 1 );
        }

        this.UpdatePageControll( _pageCont, _currentPageIndex, this.numberOfPages(), ((UIView)this._pageViews[_currentPageIndex]) );
        this._scView.BringSubviewToFront( _pageCont );


        this.NavigationController.Title = string.Format( "{0} of {1}", _currentPageIndex + 1, this.numberOfPages() );
    }

    private void layoutPages(){
        SizeF pageSize = this.pageSize();
        this._scView.ContentSize = new SizeF( this.numberOfPages() * pageSize.Width, pageSize.Height );
        //move all visible pages to their places, because otherwise they may overlap
        for (int pageIndex = 0; pageIndex < this.numberOfPages(); pageIndex++) {
            if(this.isPageLoaded( pageIndex ))
                this.layoutPage( pageIndex );
        }
    }

    public override void ViewWillAppear (bool animated)
    {
        this.layoutPages();
        this.currentPageIndexDidChange();
        this._scView.ContentOffset = new PointF( _currentPageIndex * this.pageSize().Width, 0 );
    }

    class ScViewDelegate : UIScrollViewDelegate
    {
        Test_Details_Controller id;
        public ScViewDelegate ( Test_Details_Controller id )
        {
            this.id = id;
        }
        public override void Scrolled (UIScrollView scrollView)
        {

            if(id._rotationInProgress)
                return;//UIScrollView layoutSubviews code adjusts contentOffset, breaking our logic

            SizeF pageSize = id.pageSize();
            int newPageIndex = ((int)id._scView.ContentOffset.X + (int)pageSize.Width / 2) / (int)pageSize.Width;
            if( newPageIndex == id._currentPageIndex )
                return;

            id._currentPageIndex = newPageIndex;
            id.currentPageIndexDidChange();
        }
    }

    public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
    {
        return toInterfaceOrientation != UIInterfaceOrientation.PortraitUpsideDown;
    }

    public override void WillRotate (UIInterfaceOrientation toInterfaceOrientation, double duration)
    {           
        _rotationInProgress = true;
        //hide other page views because they may overlap the current page during animation
        for (int pageIndex = 0; pageIndex < this.numberOfPages(); pageIndex++) {
            if(this.isPageLoaded( pageIndex ))
                this.viewForPage( pageIndex ).Hidden = ( pageIndex != _currentPageIndex );
        }
    }
    public override void WillAnimateRotation (UIInterfaceOrientation toInterfaceOrientation, double duration)
    {
    //resize and reposition the page view, but use the current contentOffset as page origin
    //(note that the scrollview has already been resized by the time this method is called)
        SizeF pageSize = this.pageSize();
        UIView pageView = this.viewForPage( _currentPageIndex );
        this.viewForPage( _currentPageIndex ).Frame = new RectangleF( this._scView.ContentOffset.X, 0, pageSize.Width, pageSize.Height );           
    }
    public override void DidRotate (UIInterfaceOrientation fromInterfaceOrientation)
    {
        base.DidRotate (fromInterfaceOrientation);

        //adjust frames according to the new page size - this does not cause any visible changes
        this.layoutPages();
        this._scView.ContentOffset = new PointF( _currentPageIndex * this.pageSize().Width, 0 );

        //unhide
        for (int pageIndex = 0; pageIndex < this.numberOfPages(); pageIndex++) {
            if( this.isPageLoaded( pageIndex ) )
                this.viewForPage( pageIndex ).Hidden = false;
        }

        _rotationInProgress = false;
    }               

    public override void DidReceiveMemoryWarning ()
    {
        //SuperHandle = DidReceiveMemoryWarning();
        if(this._pageViews != null)
        {
            //unload non-visible pages in case the memory is scarse
            for (int pageIndex = 0; pageIndex < this.numberOfPages(); pageIndex++) {
                if( pageIndex < _currentPageIndex - 1 || pageIndex > _currentPageIndex + 1 )
                    if( this.isPageLoaded(pageIndex) ){
                        UIView pageview = (UIView)this._pageViews[ pageIndex ];
                        this._pageViews[ pageIndex ] = null;
                        pageview.RemoveFromSuperview();
                    }
            }
        }
    }
    public override void ViewDidUnload ()
    {
        this._pageViews = null;
        this._scView = null;
    }       
}

InformationsquelleAutor