monotouch拍照、选择图片上传实现

刺骨的言语ヽ痛彻心扉 2022-08-07 00:26 186阅读 0赞

不多说，上码：

选择图片上传========》

using System;
    using System.Drawing;
    using MonoTouch.AssetsLibrary;
    using MonoTouch.UIKit;
    using MonoTouch.Foundation;
    
    namespace world
    {
    	public class ImageViewController : UIViewController
    	{
    		UIImagePickerController imagePicker;
    		UIButton choosePhotoButton;
    		UIImageView imageView;
    
    		public ImageViewController ()
    		{
    		}
    
    		public override void ViewWillAppear (bool animated)
    		{
    			base.ViewWillAppear (animated);
    			this.NavigationController.SetNavigationBarHidden (false, false);
    		}
    
    		public override void ViewDidLoad ()
    		{
    			base.ViewDidLoad ();
    			Title = "选择图片";
    			View.BackgroundColor = UIColor.White;
    
    			imageView = new UIImageView (new RectangleF (10, 80, 300, 300));
    			Add (imageView);
    
    			choosePhotoButton = UIButton.FromType (UIButtonType.RoundedRect);
    			choosePhotoButton.Frame = new RectangleF (10, 200, 100, 40);
    			choosePhotoButton.SetTitle ("Picker", UIControlState.Normal);
    			choosePhotoButton.TouchUpInside += (s, e) => {
    				// create a new picker controller
    				imagePicker = new UIImagePickerController ();
    
    				// set our source to the photo library
    				imagePicker.SourceType = UIImagePickerControllerSourceType.PhotoLibrary;
    
    				// set what media types
    				imagePicker.MediaTypes = UIImagePickerController.AvailableMediaTypes (UIImagePickerControllerSourceType.PhotoLibrary);
    
    				imagePicker.FinishedPickingMedia += Handle_FinishedPickingMedia;
    				imagePicker.Canceled += Handle_Canceled;
    
    				// show the picker
    				NavigationController.PresentViewController (imagePicker, true, null);
    			};
    			View.Add (choosePhotoButton);
    		}
    
    		// Do something when the
    		void Handle_Canceled (object sender, EventArgs e)
    		{
    			Console.WriteLine ("picker cancelled");
    			imagePicker.DismissViewController (true, null);
    		}
    
    		// This is a sample method that handles the FinishedPickingMediaEvent
    		protected void Handle_FinishedPickingMedia (object sender, UIImagePickerMediaPickedEventArgs e)
    		{
    			// determine what was selected, video or image
    			bool isImage = false;
    			switch (e.Info [UIImagePickerController.MediaType].ToString ()) {
    			case "public.image":
    				Console.WriteLine ("Image selected");
    				isImage = true;
    				break;
    
    			case "public.video":
    				Console.WriteLine ("Video selected");
    				break;
    			}
    
    			Console.WriteLine (" ==> Reference URL: [" + UIImagePickerController.ReferenceUrl + "]");
    
    			// get common info (shared between images and video)
    			NSUrl referenceURL = e.Info [new NSString ("UIImagePickerControllerReferenceURL")] as NSUrl;
    			if (referenceURL != null)
    				Console.WriteLine (referenceURL.ToString ());
    
    			// if it was an image, get the other image info
    			if (isImage) {
    
    				// get the original image
    				UIImage originalImage = e.Info [UIImagePickerController.OriginalImage] as UIImage;
    				if (originalImage != null) {
    					// do something with the image
    					Console.WriteLine ("got the original image");
    
    					var documentsDirectory = Environment.GetFolderPath (Environment.SpecialFolder.Personal);
    					string jpgFilename = System.IO.Path.Combine (documentsDirectory, DateTime.Now.ToString ("yyyyMMddHHmmss") + ".jpg");
    					NSData imgData = originalImage.AsJPEG ();
    					NSError err = null;
    					if (imgData.Save (jpgFilename, false, out err)) {
    						Console.WriteLine ("saved as " + jpgFilename);
    					} else {
    						Console.WriteLine ("NOT saved as " + jpgFilename + " because" + err.LocalizedDescription);
    					}
    
    					//imageView.Image = originalImage;
    					imageView.Image = UIImage.FromFile (jpgFilename);
    				}
    
    				// get the edited image
    				UIImage editedImage = e.Info [UIImagePickerController.EditedImage] as UIImage;
    				if (editedImage != null) {
    					// do something with the image
    					Console.WriteLine ("got the edited image");
    					imageView.Image = editedImage;
    				}
    
    				//- get the image metadata
    				NSDictionary imageMetadata = e.Info [UIImagePickerController.MediaMetadata] as NSDictionary;
    				if (imageMetadata != null) {
    					// do something with the metadata
    					Console.WriteLine ("got image metadata");
    				}
    
    			}
    			// if it's a video
    			else {
    				// get video url
    				NSUrl mediaURL = e.Info [UIImagePickerController.MediaURL] as NSUrl;
    				if (mediaURL != null) {
    					//
    					Console.WriteLine (mediaURL.ToString ());
    				}
    			}
    
    			// dismiss the picker
    			imagePicker.DismissViewController (true, null);
    		}
    
    		//...
    
    	}
    }

注意，从模拟器中调试的时候，选择的图片需要先黏贴，然后保存，才可以选择。关于这点百度一下就知道了。

拍照实现图片上传，核心代码如下：

//
    // Camera.cs: Support code for taking pictures
    //
    // Copyright 2010 Miguel de Icaza
    //
    // Permission is hereby granted, free of charge, to any person obtaining a copy
    // of this software and associated documentation files (the "Software"), to deal
    // in the Software without restriction, including without limitation the rights
    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    // copies of the Software, and to permit persons to whom the Software is
    // furnished to do so, subject to the following conditions:
    // 
    // The above copyright notice and this permission notice shall be included in
    // all copies or substantial portions of the Software.
    // 
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    // THE SOFTWARE.
    
    using System;
    using MonoTouch.UIKit;
    using MonoTouch.Foundation;
    
    namespace TweetStation
    {
    	//
    	// A static class that will reuse the UIImagePickerController
    	// as iPhoneOS has a crash if multiple UIImagePickerController are created
    	//   http://stackoverflow.com/questions/487173
    	// (Follow the links)
    	//
    	public static class Camera
    	{
    		static UIImagePickerController picker;
    		static Action<NSDictionary> _callback;
    		
    		static void Init ()
    		{
    			if (picker != null)
    				return;
    			
    			picker = new UIImagePickerController ();
    			picker.Delegate = new CameraDelegate ();
    		}
    		
    		class CameraDelegate : UIImagePickerControllerDelegate {
    			public override void FinishedPickingMedia (UIImagePickerController picker, NSDictionary info)
    			{
    				var cb = _callback;
    				_callback = null;
    				
    				picker.DismissViewController (true, null);
    				cb (info);
    			}
    		}
    
    		//照相
    		public static void TakePicture (UIViewController parent, Action<NSDictionary> callback)
    		{
    			Init ();
    			picker.SourceType = UIImagePickerControllerSourceType.Camera;
    			_callback = callback;
    			parent.PresentViewController (picker, true, null);
    		}
    		
    		public static void SelectPicture (UIViewController parent, Action<NSDictionary> callback)
    		{
    			Init ();
    			picker.SourceType = UIImagePickerControllerSourceType.PhotoLibrary;
    			_callback = callback;
    			parent.PresentViewController (picker, true, null);
    		}
    	}
    }

using System;
    using System.Drawing;
    using MonoTouch.AssetsLibrary;
    using MonoTouch.UIKit;
    using MonoTouch.Foundation;
    
    namespace ImageView {
    
    	public class ImageViewController : UIViewController {
    		
    		UIButton cameraButton;
    
    		public override void ViewDidLoad ()
    		{
    			base.ViewDidLoad ();
    			Title = "Save to Album";
    			View.BackgroundColor = UIColor.White;
    
    			cameraButton = UIButton.FromType (UIButtonType.RoundedRect);
    			cameraButton.Frame = new RectangleF(10, 200, 100,40);
    			cameraButton.SetTitle ("Camera", UIControlState.Normal);
    			cameraButton.TouchUpInside += (sender, e) => {
    			
    				TweetStation.Camera.TakePicture (this, (obj) =>{
    					// https://developer.apple.com/library/ios/#documentation/uikit/reference/UIImagePickerControllerDelegate_Protocol/UIImagePickerControllerDelegate/UIImagePickerControllerDelegate.html#//apple_ref/occ/intfm/UIImagePickerControllerDelegate/imagePickerController:didFinishPickingMediaWithInfo:
    					var photo = obj.ValueForKey(new NSString("UIImagePickerControllerOriginalImage")) as UIImage;
    					var meta = obj.ValueForKey(new NSString("UIImagePickerControllerMediaMetadata")) as NSDictionary;
    					
    // This bit of code saves to the Photo Album with metadata
    					ALAssetsLibrary library = new ALAssetsLibrary();
    					library.WriteImageToSavedPhotosAlbum (photo.CGImage, meta, (assetUrl, error) =>{
    						Console.WriteLine ("assetUrl:"+assetUrl);
    					});
    					
    
    // This bit of code does basic 'save to photo album', doesn't save metadata
    //			var someImage = UIImage.FromFile("someImage.jpg");
    //			someImage.SaveToPhotosAlbum ((image, error)=> {
    //				var o = image as UIImage;
    //				Console.WriteLine ("error:" + error);
    //			});
    					
    
    // This bit of code saves to the application's Documents directory, doesn't save metadata
    //					var documentsDirectory = Environment.GetFolderPath
    //					                          (Environment.SpecialFolder.Personal);
    //					string jpgFilename = System.IO.Path.Combine (documentsDirectory, "Photo.jpg");
    //					NSData imgData = photo.AsJPEG();
    //					NSError err = null;
    //					if (imgData.Save(jpgFilename, false, out err))
    //					{
    //					    Console.WriteLine("saved as " + jpgFilename);
    //					} else {
    //					    Console.WriteLine("NOT saved as" + jpgFilename + " because" + err.LocalizedDescription);
    //					}
    
    
    				});
    			};
    			View.Add (cameraButton);
    			
    			if (!UIImagePickerController.IsSourceTypeAvailable (UIImagePickerControllerSourceType.Camera)) {
    				cameraButton.SetTitle ("No camera", UIControlState.Disabled);
    				cameraButton.SetTitleColor (UIColor.Gray, UIControlState.Disabled);
    				cameraButton.Enabled = false;
    			}
    		}
    	}
    }

顺便说一下，

originalImage.AsJPEG ();

后面有一个 **AsStream**属性，这样可以对选择的图片进行远程服务器上传，你懂的。