IOS OpenInActivity Mono

浏览数：27 / 时间：2015年06月11日

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需要要在UIActivityViewController Action栏中加入一个OpenInActivity.

原先其实就是在原先的基础上将OpenIn 整合进来。

创建一个OpenInActivity继承与UIActivity。

复写三个关键属性 :

1. Title: 显示活动的名称

2. Image: 显示活动的图标

3. Type: 可重复使用的名称 "com.xxx.activity.openin"

复写三个关键方法:

1. bool CanPerform(NSObject[] activityItems) :方法返回Bool对传入的activityItems进行判断，返回是否显示此Activity。

2. Prepare(NSObject[] activityItems): 当CanPerform方法通过后会被调用,准备的代码放在这里，一般是对url的处理

3. Perform(): 当前Activty被点击时会触发的方法

方法生命周期:

.. CanPerform => Prepare() => Perform() ..

实现过程:

判断文件格式是否支持

将传入Url用 List<NSUrl>存储起来

调用Open In方法所使用对象 UIDocumentInteractionController讲文件打开

因为手机上UIActivityViewController展示方式不同，所以需要加以判断，IPad通过UIBarButtonItem将它Popover出来，IPhone 则是直接Present。

所以在实例化对象时,根据设备不同而传入UIBarButtonItem或superView。

 1             var openInAppActivity = new OpeninActivity (this.View, actionButton);
 2             var fileUrl = NSUrl.FromFilename (GetReportPath());
 3             var objs = new NSObject[]{ fileUrl };
 4             var activitys = new UIActivity[]{ openInAppActivity };
 5 
 6             var excludedActivityTypes = new NSString[] {
 7                 UIActivityType.PostToWeibo,
 8                 UIActivityType.Message,
 9                 UIActivityType.PostToTwitter,
10                 UIActivityType.PostToFacebook,
11                 UIActivityType.CopyToPasteboard,
12             };
13 
14             UIActivityViewController avc = new UIActivityViewController (objs, activitys);
15             avc.ExcludedActivityTypes = excludedActivityTypes;
16 
17             openInAppActivity.ActivityDelegate = new OpenInAppActivityDelegate ();
18             if (UIUserInterfaceIdiom.Phone == UIDevice.CurrentDevice.UserInterfaceIdiom) {
19                 openInAppActivity.SuperViewController = avc;
20                 this.PresentViewController (avc, true, null);
21             }  else {
22                 if (activityPopoverController == null)
23                     activityPopoverController = new UIPopoverController (avc);
24                 openInAppActivity.SuperViewController = this.activityPopoverController;
25                 this.activityPopoverController.PresentFromBarButtonItem (actionButton, UIPopoverArrowDirection.Any, true);
26             }

View Code

最终效果:

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代码

  1 public class OpeninActivity:UIActivity, IUIDocumentInteractionControllerDelegate, IUIActionSheetDelegate
  2     {
  3         public readonly NSString OpenInActivityType = new NSString("com.pasasoft.activity.Openin");
  4 
  5         private List<NSUrl> fileURLs;
  6         private CGRect rect;
  7         private UIBarButtonItem barButtonItem;
  8         private UIView superView;
  9         private UIDocumentInteractionController docController;
 10 
 11         public OpenInAppActivityDelegate ActivityDelegate;
 12 
 13         public NSObject SuperViewController{ get; set;}
 14 
 15         public override NSString Type {
 16             get {
 17                 return OpenInActivityType;
 18             }
 19         }
 20 
 21         public override string Title {
 22             get {
 23                 return "Open In";
 24             }
 25         }
 26 
 27         public override UIImage Image {
 28             get {
 29                 return UIImage.FromBundle (ImageFiles.OpenIn);
 30             }
 31         }
 32 
 33         public OpeninActivity(UIView view, CGRect rect):base()
 34         {
 35             this.superView = view;
 36             this.rect = rect;
 37         }
 38 
 39         public OpeninActivity(UIView view, UIBarButtonItem barButtonItem):base()
 40         {
 41             this.superView = view;
 42             this.barButtonItem = barButtonItem;
 43         }
 44 
 45         public override bool CanPerform (NSObject[] activityItems)
 46         {
 47             int count = 0;
 48             foreach (var item in activityItems) {
 49                 if (item.IsKindOfClass(new Class(typeof(NSUrl))) && ((NSUrl)item).IsFileUrl) 
 50                     count++;                
 51             }
 52 
 53             return (count >= 1);
 54         }
 55 
 56         public override void Prepare (NSObject[] activityItems)
 57         {
 58             List<NSUrl> nsurls = new List<NSUrl> ();
 59             foreach (var item in activityItems) {
 60                 if (item.IsKindOfClass(new Class(typeof(NSUrl))) && ((NSUrl)item).IsFileUrl) {
 61                     nsurls.Add (((NSUrl)item));
 62                 }
 63 //                if (item.IsKindOfClass(new Class(typeof(UIImage)))) {
 64 //                    
 65 //                }
 66             }
 67             this.fileURLs = nsurls;
 68         }
 69 
 70         public override void Perform ()
 71         {
 72             if (this.SuperViewController == null) {
 73                 this.Finished (true);
 74                 return;
 75             }
 76 
 77             if (this.SuperViewController.RespondsToSelector (new Selector ("dismissPopoverAnimated"))) {
 78                 ((UIPopoverController)SuperViewController).Dismiss (true);
 79                 ((UIPopoverController)SuperViewController).Delegate.DidDismiss ((UIPopoverController)this.SuperViewController);
 80                 presentOpenIn ();
 81             }  else if ((this.SuperViewController as UIPopoverController)?.ContentViewController != null) {
 82                 ((UIPopoverController)this.SuperViewController).Dismiss (true);
 83                 presentOpenIn ();
 84             }  else {
 85                 presentOpenIn ();
 86             }
 87         }
 88 
 89         private void presentOpenIn()
 90         {
 91             if (fileURLs.Count > 1) {
 92                 this.openSelectFileActionSheet ();
 93             }  else {
 94                 this.openDocumentInteractionControllerWithFileURL (this.fileURLs.Last());
 95             }
 96         }
 97 
 98         #region Helper
 99 
100         private string UTIForURL(NSUrl url)
101         {
102             CFString UTI = UTType.CreatePreferredIdentifier (UTType.TagClassFilenameExtension, url.PathExtension, null);
103             return UTI.ToString ();
104         }
105 
106         private void openDocumentInteractionControllerWithFileURL(NSUrl fileURL)
107         {
108             this.docController = new UIDocumentInteractionController ();
109             docController.Url = fileURL;
110             docController.WeakDelegate = this;
111             docController.Uti = this.UTIForURL (fileURL);
112             bool success;
113             if (UIUserInterfaceIdiom.Phone == UIDevice.CurrentDevice.UserInterfaceIdiom) {
114                 success = this.docController.PresentOpenInMenu (CGRect.Empty, this.superView, true);
115             }  else {
116                 if (this.barButtonItem != null) {
117                     success = docController.PresentOpenInMenu (this.barButtonItem, true);
118                 }  else {
119                     success = this.docController.PresentOpenInMenu (CGRect.Empty, this.superView, true);
120                 }
121             }
122 
123             if (!success) {
124                 string deviceType = UIDevice.CurrentDevice.LocalizedModel;
125                 string message = "Your " + deviceType + " doesn‘t seem to have any other Apps installed that can open this document.";
126                 string title = "No suitable App installed";
127                 AlertHelper.ShowAlert (title, message);
128                 this.Finished (false);
129             }
130 
131         }
132 
133         public void DismissDocumentInteractionControllerAnimated(bool animated)
134         {
135             this.docController.DismissMenu (animated);
136 
137             this.Finished (false);
138         }
139 
140         private void openSelectFileActionSheet()
141         {
142             UIActionSheet actionSheet = new UIActionSheet ("Select a file");
143             actionSheet.WeakDelegate = this;
144 
145             foreach (var url in this.fileURLs) {
146                 actionSheet.AddButton (url.LastPathComponent);
147             }
148 
149             actionSheet.CancelButtonIndex = actionSheet.AddButton ("Cancel");
150 
151 
152             if (UIUserInterfaceIdiom.Phone == UIDevice.CurrentDevice.UserInterfaceIdiom) {
153                 actionSheet.ShowFrom (CGRect.Empty, this.superView, true);
154             }  else {
155                 if (this.barButtonItem != null) {
156                     actionSheet.ShowFrom (this.barButtonItem, true);
157                 }  else {
158                     actionSheet.ShowFrom (rect, this.superView, true);
159                 }
160             }
161         }
162 
163         #endregion
164 
165         #region UIDocumentInteractionControllerDelegate
166 
167         [Export ("documentInteractionControllerWillPresentOpenInMenu:")]
168         public void WillPresentOpenInMenu (UIDocumentInteractionController controller)
169         {
170             if (this.ActivityDelegate.RespondsToSelector (new Selector ("OpenInAppActivityWillPresentDocumentInteractionController"))) {
171                 this.ActivityDelegate.OpenInAppActivityDidDismissDocumentInteractionController (this);
172             }
173         }
174 
175         [Export ("documentInteractionControllerDidDismissOpenInMenu:")]
176         public void DidDismissOpenInMenu (UIDocumentInteractionController controller)
177         {
178             if (this.ActivityDelegate.RespondsToSelector (new Selector ("OpenInAppActivityDidDismissDocumentInteractionController"))) {
179                 this.ActivityDelegate.OpenInAppActivityDidDismissDocumentInteractionController (this);
180             }
181         }
182 
183         [Export ("documentInteractionController:didEndSendingToApplication:")]
184         public void DidEndSendingToApplication (UIDocumentInteractionController controller, string application)
185         {
186             if (this.ActivityDelegate.RespondsToSelector (new Selector ("OpenInAppActivityDidEndSendingToApplication"))) {
187                 this.ActivityDelegate.OpenInAppActivityDidEndSendingToApplication (this);
188             }else if (this.ActivityDelegate.RespondsToSelector (new Selector ("OpenInAppActivityDidSendToApplication"))) {
189                 this.ActivityDelegate.OpenInAppActivityDidSendToApplication (application);
190             }
191 
192             this.Finished (true);
193         }
194 
195         #endregion
196 
197         #region Action sheet delegate
198 
199         [Export ("actionSheet:didDismissWithButtonIndex:")]
200         public void Dismissed (UIActionSheet actionSheet, nint buttonIndex)
201         {
202             if (buttonIndex != actionSheet.CancelButtonIndex) {
203                 this.openDocumentInteractionControllerWithFileURL (this.fileURLs[(int)buttonIndex]);
204             }  else {
205                 this.Finished (false);
206             }
207         }
208 
209         #endregion
210 
211         #region Image conversion
212 
213         private void localFileURLForImage(UIImage image)
214         {
215 
216         }
217 
218         #endregion
219     }
220 
221     public class OpenInAppActivityDelegate:NSObject
222     {
223         public virtual void OpenInAppActivityWillPresentDocumentInteractionController(OpeninActivity activity){}
224         public virtual void OpenInAppActivityDidDismissDocumentInteractionController(OpeninActivity activity){}
225         public virtual void OpenInAppActivityDidEndSendingToApplication(OpeninActivity activity){}
226         public virtual void OpenInAppActivityDidSendToApplication(string application){}
227     }