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【C#】 osx 下拉刷新
作者:DsonKing / 发布于2016/1/11/ 552
?using System;
using UIKit;
using CoreAnimation;
using Foundation;
 
namespace ScrollRefreshView
{
    public enum EGOPullRefreshState:int
    {
        EGOOPullRefreshPulling = 0,
        EGOOPullRefreshNormal,
        EGOOPullRefreshLoading, 
    };
 
    public interface IEGORefreshTableHeaderDelegate
    {
        void EGORefreshTableHeaderDidTriggerRefresh(EGORefreshTableHeaderView view);
 
        bool EGORefreshTableHeaderDataSourceIsLoading(EGORefreshTableHeaderView view);
 
        NSDate EGORefreshTableHeaderDataSourceLastUpdated(EGORefreshTableHeaderView view);
          
    }
 
    public class EGORefreshTableHeaderView:UIView
    {
        #region Field
 
        private IEGORefreshTableHeaderDelegate _delegate;
 
        private EGOPullRefreshState _state;
 
        private UILabel _lastUpdatedLabel;
 
        private UILabel _statusLabel;
 
        private CALayer _arrowImage;
 
        private UIActivityIndicatorView _activityView;
 
        #endregion
 
        #region Property
        public IEGORefreshTableHeaderDelegate Delegate
        {
            get
            {
                return _delegate;
            }
            set
            {
                _delegate = value;
            }
        }
        #endregion
 
        #region Construct
        public EGORefreshTableHeaderView(CoreGraphics.CGRect frame):base(frame)
        {
            AutoresizingMask = UIViewAutoresizing.FlexibleWidth;
            BackgroundColor = UIColor.FromRGBA((nfloat)(226.0/255.0),(nfloat)(231.0/255.0),(nfloat)(237.0/255.0),(nfloat)(1.0));
 
            UILabel label = new UILabel(new CoreGraphics.CGRect(0.0f, frame.Size.Height - 30.0f, frame.Size.Width, 20.0f));
            label.AutoresizingMask = UIViewAutoresizing.FlexibleWidth;
            label.Font =UIFont.SystemFontOfSize(12.0f);
            label.TextColor=UIColor.FromRGBA((nfloat)(87.0/255.0),(nfloat)(108.0/255.0),(nfloat)(137.0/255.0),(nfloat)(1.0));
            label.ShadowColor = UIColor.FromWhiteAlpha(0.9f,1.0f);
            label.ShadowOffset = new CoreGraphics.CGSize(0.0f,1.0f);
            base.AddSubview(label);
            _lastUpdatedLabel = label;
 
            label = new UILabel(new CoreGraphics.CGRect(0.0f, frame.Size.Height - 48.0f, frame.Size.Width, 20.0f));
            label.AutoresizingMask = UIViewAutoresizing.FlexibleWidth;
            label.Font =UIFont.SystemFontOfSize(13.0f);
            label.TextColor=UIColor.FromRGBA((nfloat)(87.0/255.0),(nfloat)(108.0/255.0),(nfloat)(137.0/255.0),(nfloat)(1.0));
            label.ShadowColor = UIColor.FromWhiteAlpha(0.9f,1.0f);
            label.ShadowOffset = new CoreGraphics.CGSize(0.0f,1.0f);
            label.BackgroundColor = UIColor.Clear;
            label.TextAlignment = UITextAlignment.Center;
            base.AddSubview(label);
            _statusLabel=label;
 
            CALayer layer = CALayer.Create();
            layer.Frame = new CoreGraphics.CGRect(25.0f, frame.Size.Height - 65.0f, 30.0f, 55.0f);
            layer.ContentsGravity="kCAGravityResizeAspect";
            layer.Contents = UIImage.FromBundle("blueArrow").CGImage;
 
            if(UIScreen.MainScreen.RespondsToSelector(new ObjCRuntime.Selector("scale")))
            {
                layer.ContentsScale = UIScreen.MainScreen.Scale;
            }
            base.Layer.AddSublayer(layer);
            _arrowImage = layer;
 
            UIActivityIndicatorView view = new UIActivityIndicatorView(UIActivityIndicatorViewStyle.Gray);
            view.Frame = new CoreGraphics.CGRect(25.0f, frame.Size.Height - 38.0f, 20.0f, 20.0f);
            base.AddSubview(view);
            _activityView = view;
 
            SetState(EGOPullRefreshState.EGOOPullRefreshNormal);
            
        }
 
 
        #endregion
 
        #region Function
 
        public void RefreshLastUpdatedDate()
        {
            if (_delegate != null)
            {
                NSDate date = _delegate.EGORefreshTableHeaderDataSourceLastUpdated(this);
                NSDateFormatter formatter = new NSDateFormatter();
                formatter.AMSymbol = "AM";
                formatter.PMSymbol = "PM";
                formatter.DateFormat = "MM/dd/yyyy hh:mm:a";
                _lastUpdatedLabel.Text = string.Format("Last Updated:{0}", formatter.StringFor(date));
                NSUserDefaults.StandardUserDefaults.SetValueForKey(new NSString(_lastUpdatedLabel.Text), new NSString("EGORefreshTableView_LastRefresh"));
                NSUserDefaults.StandardUserDefaults.Synchronize();
            }
            else
            {
                _lastUpdatedLabel.Text = string.Empty;
            }
        }
 
        public void EGORefreshScrollViewDidScroll(UIScrollView scrollView)
        {
            if (_state == EGOPullRefreshState.EGOOPullRefreshLoading)
            {
                double offset=System.Math.Max(scrollView.ContentOffset.Y * -1,0);
                offset = System.Math.Min(offset, 60);
                scrollView.ContentInset = new UIEdgeInsets((nfloat)offset, 0.0f, 0.0f, 0.0f);
            }
            else if(scrollView.Dragging)
            {
                bool _loading = false;
                if (_delegate != null)
                {
                    _loading = _delegate.EGORefreshTableHeaderDataSourceIsLoading(this);  
                }
 
                if (_state == EGOPullRefreshState.EGOOPullRefreshPulling && scrollView.ContentOffset.Y > -65.0f && scrollView.ContentOffset.Y < 0.0f && !_loading)
                {
                    SetState(EGOPullRefreshState.EGOOPullRefreshNormal);
                }
                else if (_state == EGOPullRefreshState.EGOOPullRefreshNormal && scrollView.ContentOffset.Y < -65.0f && !_loading)
                {
                    SetState(EGOPullRefreshState.EGOOPullRefreshPulling);
                }
                if (scrollView.ContentInset.Top != 0) {
                    scrollView.ContentInset = UIEdgeInsets.Zero;
                }
            }
        }
 
        public void EGORefreshScrollViewDidEndDragging(UIScrollView scrollView)
        {
            bool _loading = false;
            if (_delegate != null)
            {
                _loading = _delegate.EGORefreshTableHeaderDataSourceIsLoading(this);  
            }
 
            if (scrollView.ContentOffset.Y <= -65.0f && !_loading)
            {
                if (_delegate != null)
                {
                    _delegate.EGORefreshTableHeaderDidTriggerRefresh(this);
                }
                SetState(EGOPullRefreshState.EGOOPullRefreshLoading);
                UIView.BeginAnimations(null, IntPtr.Zero);
                UIView.SetAnimationDuration(0.2);
                scrollView.ContentInset = new UIEdgeInsets(60.0f, 0.0f, 0.0f, 0.0f);
                UIView.CommitAnimations();
            }
        }
 
        public void EGORefreshScrollViewDidEndDraggingWithRefreshButton(UIScrollView scrollView)
        {
            bool _loading = false;
            if (_delegate != null)
            {
                _loading = _delegate.EGORefreshTableHeaderDataSourceIsLoading(this);
                _delegate.EGORefreshTableHeaderDidTriggerRefresh(this);
            }
            SetState(EGOPullRefreshState.EGOOPullRefreshLoading);
            UIView.BeginAnimations(null, IntPtr.Zero);
            UIView.SetAnimationDuration (0.2);
            scrollView.ContentInset = new UIEdgeInsets(60.0f, 0.0f, 0.0f, 0.0f);
            UIView.CommitAnimations();
        }
 
        public void EGORefreshScrollViewDataSourceDidFinishedLoading(UIScrollView scrollView)
        {
            UIView.BeginAnimations(null, IntPtr.Zero);
            UIView.SetAnimationDuration (0.3);
            scrollView.ContentInset = new UIEdgeInsets(0.0f, 0.0f, 0.0f, 0.0f);
            UIView.CommitAnimations();
            SetState(EGOPullRefreshState.EGOOPullRefreshNormal);
        }
 
        void SetState(EGOPullRefreshState state)
        {
            switch(state)
            {
                case  EGOPullRefreshState.EGOOPullRefreshPulling:
                    {
                        _statusLabel.Text = "Release to refresh...";
                        CATransaction.Begin();
                        CATransaction.AnimationDuration = 0.18f;
                        _arrowImage.Transform = CATransform3D.MakeRotation((nfloat)((System.Math.PI / 180.0) * 180.0f), 0.0f, 0.0f, 1.0f);
                        CATransaction.Commit();
                    }
                    break;
                case  EGOPullRefreshState.EGOOPullRefreshNormal:
                    {
                        if(_state==EGOPullRefreshState.EGOOPullRefreshPulling)
                        {
                            CATransaction.Begin();
                            CATransaction.AnimationDuration = 0.18f;
                            _arrowImage.Transform = CATransform3D.Identity;
                            CATransaction.Commit();
                        }
 
                        _statusLabel.Text = "Pull down to refresh...";
                        _activityView.StopAnimating();
                        CATransaction.Begin();
                        CATransaction.SetValueForKey(NSNumber.FromBoolean(true),new NSString("kCATransactionDisableActions"));
                        _arrowImage.Hidden = false;
                        _arrowImage.Transform = CATransform3D.Identity;
                        CATransaction.Commit();
                        RefreshLastUpdatedDate();
                    }
                    break;
                case  EGOPullRefreshState.EGOOPullRefreshLoading:
                    {
                        _statusLabel.Text = "Loading...";
                        _activityView.StartAnimating();
                        CATransaction.Begin();
                        CATransaction.SetValueForKey(NSNumber.FromBoolean(true),new NSString("kCATransactionDisableActions"));
                        _arrowImage.Hidden = false;
                        CATransaction.Commit(); 
                    }
                    break;
                    default:
                    break;
            }
            _state = state;
        }
        #endregion
        
    }
}





 ViewController.cs

using System;
 
using UIKit;
using Foundation;
using CoreGraphics;
 
namespace ScrollRefreshView
{
    public partial class ViewController : UIViewController
    {
        #region Field
        WebViewDelegate _webdelegate;
 
        ScrollViewDelegate _scrolldelegate;
 
        EGORefreshTableHeaderDelegate _refreshtableheaderdelegate;
 
        EGORefreshTableHeaderView  _refreshHeaderView;
 
        bool _reloading;
        #endregion
 
        #region Property
 
        public bool Reloading
        {
            get
            {
                return _reloading;
            }
            set
            {
                _reloading = value;
            }
        }
 
        public EGORefreshTableHeaderView  RefreshHeaderView
        {
            get
            {
                return _refreshHeaderView;
            }
 
        }
        #endregion
 
 
        public ViewController(IntPtr handle)
            : base(handle)
        {
        }
 
 
        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            WebView.Delegate = new WebViewDelegate(this);
            WebView.ScrollView.Delegate = new ScrollViewDelegate(this);
            LoadPage();
 
            if (_refreshHeaderView == null)
            {
                _refreshHeaderView = new EGORefreshTableHeaderView(new  CoreGraphics.CGRect(0, 0-WebView.ScrollView.Bounds.Size.Height, WebView.ScrollView.Bounds.Size.Width, WebView.ScrollView.Bounds.Height));
                _refreshHeaderView.Delegate = new EGORefreshTableHeaderDelegate(this);
                WebView.ScrollView.AddSubview(_refreshHeaderView);
            }
            _refreshHeaderView.RefreshLastUpdatedDate();
        }
 
        public void LoadPage()
        {
            WebView.LoadRequest(NSUrlRequest.FromUrl(NSUrl.FromString("http://www.baidu.com")));
        }
        public override void DidReceiveMemoryWarning()
        {
            base.DidReceiveMemoryWarning();
            // Release any cached data, images, etc that aren't in use.
        }
    }
 
    public class WebViewDelegate:UIWebViewDelegate
    {
 
        #region
        ViewController _webViewController;
        #endregion
 
        public override void LoadStarted(UIWebView webView)
        {
            _webViewController.Reloading=true;
        }
 
        public override void LoadingFinished(UIWebView webView)
        {
            _webViewController.Reloading=false;
            _webViewController.RefreshHeaderView.EGORefreshScrollViewDataSourceDidFinishedLoading(_webViewController.WebView.ScrollView);
        }
 
        public override void LoadFailed(UIWebView webView, NSError error)
        {
            _webViewController.Reloading=false;
            _webViewController.RefreshHeaderView.EGORefreshScrollViewDataSourceDidFinishedLoading(_webViewController.WebView.ScrollView);
        }
 
 
        public WebViewDelegate(ViewController webViewController)
        {
            _webViewController=webViewController;
        }
    }
 
    public class ScrollViewDelegate:UIScrollViewDelegate
    {
        #region
        ViewController _webViewController;
        #endregion
 
        public ScrollViewDelegate(ViewController webViewController)
        {
            _webViewController=webViewController;
        }
 
        public override void Scrolled(UIScrollView scrollView)
        {
            _webViewController.RefreshHeaderView.EGORefreshScrollViewDidScroll(scrollView);
        }
 
        public override void WillEndDragging(UIScrollView scrollView, CoreGraphics.CGPoint velocity, ref CGPoint targetContentOffset)
        {
            _webViewController.RefreshHeaderView.EGORefreshScrollViewDidEndDragging(scrollView);
        }
 
        public override void ScrollAnimationEnded(UIScrollView scrollView)
        {
            _webViewController.RefreshHeaderView.EGORefreshScrollViewDidEndDragging(scrollView);
        }
 
    }
 
    public class EGORefreshTableHeaderDelegate:IEGORefreshTableHeaderDelegate
    {
        #region
        ViewController _webViewController;
        #endregion
 
        public EGORefreshTableHeaderDelegate(ViewController webViewController)
        {
            _webViewController=webViewController;
        }
 
        #region IEGORefreshTableHeaderDelegate implementation
        public void EGORefreshTableHeaderDidTriggerRefresh(EGORefreshTableHeaderView view)
        {
            _webViewController.LoadPage();
        }
        public bool EGORefreshTableHeaderDataSourceIsLoading(EGORefreshTableHeaderView view)
        {
            return _webViewController.Reloading;
        }
        public NSDate EGORefreshTableHeaderDataSourceLastUpdated(EGORefreshTableHeaderView view)
        {
            return NSDate.Now;
        }
        #endregion
 
    }
}



ViewController.designer.cs 
// WARNING
//
// This file has been generated automatically by Xamarin Studio to store outlets and
// actions made in the UI designer. If it is removed, they will be lost.
// Manual changes to this file may not be handled correctly.
//
using Foundation;
using System.CodeDom.Compiler;
 
namespace ScrollRefreshView
{
    [Register ("ViewController")]
    partial class ViewController
    {
        [Outlet]
        public UIKit.UIWebView WebView { get; set; }
         
        void ReleaseDesignerOutlets ()
        {
            if (WebView != null) {
                WebView.Dispose ();
                WebView = null;
            }
        }
    }
}
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