using System;
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using AVFoundation;
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using CoreGraphics;
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using Foundation;
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using UIKit;
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namespace Shared
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{
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/// <summary>
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/// 拍照或者选择图片
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/// </summary>
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public static class Camera
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{
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static readonly UIImagePickerController _picker;
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static bool IsZoom;
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/// <summary>
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/// 拍照或者读取图片完成时调用的动作,string==null表示用户取消了拍照或者取消选择图片,string!=null,表示图片的路径
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/// </summary>
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static Action<string> _callback;
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static Camera()
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{
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_picker = new UIImagePickerController();
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_picker.Delegate = new MyCameraDelegate();
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}
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static string _fileName;
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/// <summary>
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/// Camera delegate.
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/// </summary>
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class MyCameraDelegate : UIImagePickerControllerDelegate
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{
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//16*9
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public override void FinishedPickingMedia(UIImagePickerController picker, NSDictionary info)
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{
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picker.DismissModalViewController(true);
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var tempPhoto = info.ValueForKey(new NSString("UIImagePickerControllerOriginalImage")) as UIImage;
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tempPhoto = rotateImage(tempPhoto);
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var width = tempPhoto.CGImage.Width;
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var height = tempPhoto.CGImage.Height;
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//System.Console.WriteLine("原宽度=" + width + "高度=" + height);
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nfloat noScale = width / height;
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nfloat scale = 16.0f / 9.0f;
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if (!IsZoom)
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{
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scale = noScale;
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}
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nfloat x = 0, y = 0, w = width, h = height;
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if (scale < noScale)
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{
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w = height * scale;
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x = (width - w) / 2;
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}
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else
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{
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h = width / scale;
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y = (height - h) / 2;
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}
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var imageRef = tempPhoto.CGImage.WithImageInRect(new CGRect(x, y, w, h));
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UIImage newImage = UIImage.FromImage(imageRef);
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// 关闭上下文
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//System.Console.WriteLine("改变后的宽度=" + newImage.Size.Width + "高度=" + newImage.Size.Height);
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string tempFilePath = System.IO.Path.Combine(Application.RootPath, _fileName);
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NSError err = null;
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float f = 0.1f;
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NSData nsData = newImage.AsJPEG(f);
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while (f < 1.0f)
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{
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if (200 * 1024 < nsData.Length)
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{
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break;
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}
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f += 0.1f;
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nsData = newImage.AsJPEG(f);
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}
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if (nsData.Save(tempFilePath, false, out err))
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{
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//保存成功
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}
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else
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{
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Console.WriteLine("保存图片失");
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}
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newImage.Dispose();
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_callback?.Invoke(tempFilePath);
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_callback = null;
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}
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public override void Canceled(UIImagePickerController picker)
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{
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picker.DismissModalViewController(true);
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_callback?.Invoke(null);
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_callback = null;
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}
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UIImage rotateImage(UIImage aImage)
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{
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var imgRef = aImage.CGImage;
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var width = imgRef.Width;
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var height = imgRef.Height;
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CGAffineTransform transform = CGAffineTransform.MakeIdentity();
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CGRect bounds = new CGRect(0, 0, width, height);
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nfloat scaleRatio = 1;
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nfloat boundHeight;
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UIImageOrientation orient = aImage.Orientation;
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nfloat M_PI = 3.14159265358979323846f;
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switch (orient)
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{
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case UIImageOrientation.Up: //EXIF = 1
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transform = CGAffineTransform.MakeIdentity();
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break;
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case UIImageOrientation.UpMirrored: //EXIF = 2
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transform = CGAffineTransform.MakeTranslation(width, 0.0f);
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transform = CGAffineTransform.Scale(transform, -1.0f, 1.0f);
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break;
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case UIImageOrientation.Down: //EXIF = 3
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transform = CGAffineTransform.MakeTranslation(width, height);
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transform = CGAffineTransform.Rotate(transform, M_PI);
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break;
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case UIImageOrientation.DownMirrored: //EXIF = 4
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transform = CGAffineTransform.MakeTranslation(0.0f, height);
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transform = CGAffineTransform.Scale(transform, 1.0f, -1.0f);
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break;
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case UIImageOrientation.LeftMirrored: //EXIF = 5
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boundHeight = bounds.Height;
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bounds.Height = bounds.Size.Width;
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bounds.Width = boundHeight;
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transform = CGAffineTransform.MakeTranslation(height, width);
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transform = CGAffineTransform.Scale(transform, -1.0f, 1.0f);
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transform = CGAffineTransform.Rotate(transform, 3.0f * M_PI / 2.0f);
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break;
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case UIImageOrientation.Left: //EXIF = 6
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boundHeight = bounds.Height;
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bounds.Height = bounds.Width;
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bounds.Width = boundHeight;
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transform = CGAffineTransform.MakeTranslation(0.0f, width);
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transform = CGAffineTransform.Rotate(transform, 3.0f * M_PI / 2.0f);
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break;
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case UIImageOrientation.RightMirrored: //EXIF = 7
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boundHeight = bounds.Height;
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bounds.Height = bounds.Width;
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bounds.Width = boundHeight;
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transform = CGAffineTransform.MakeScale(-1.0f, 1.0f);
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transform = CGAffineTransform.Rotate(transform, M_PI / 2.0f);
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break;
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case UIImageOrientation.Right: //EXIF = 8
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boundHeight = bounds.Height;
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bounds.Height = bounds.Width;
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bounds.Width = boundHeight;
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transform = CGAffineTransform.MakeTranslation(height, 0.0f);
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transform = CGAffineTransform.Rotate(transform, M_PI / 2.0f);
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break;
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//default:
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// [NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];
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}
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UIGraphics.BeginImageContext(bounds.Size);
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var context = UIGraphics.GetCurrentContext();
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if (orient == UIImageOrientation.Right || orient == UIImageOrientation.Left)
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{
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context.ScaleCTM(-scaleRatio, scaleRatio);
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context.TranslateCTM(-height, 0);
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}
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else
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{
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context.ScaleCTM(scaleRatio, -scaleRatio);
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context.TranslateCTM(0, -height);
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}
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context.ConcatCTM(transform);
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UIGraphics.GetCurrentContext().DrawImage(new CGRect(0, 0, width, height), imgRef);
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UIImage imageCopy = UIGraphics.GetImageFromCurrentImageContext();
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imgRef.Dispose();
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UIGraphics.EndImageContext();
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return imageCopy;
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}
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}
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/// <summary>
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/// 拍照
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/// </summary>
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/// <param name="callback">回调函数</param>
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/// <param name="fileName">文件名</param>
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public static void TakePicture(Action<string> callback, string fileName, bool isZoom = true)
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{
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_fileName = fileName;
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_callback = callback;
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_picker.SourceType = UIImagePickerControllerSourceType.Camera;
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IsZoom = isZoom;
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if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad)
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{
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if (!UIImagePickerController.IsCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front))
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{
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return;
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}
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_picker.ModalTransitionStyle = UIModalTransitionStyle.CrossDissolve;
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currentVC.PresentModalViewController(_picker, true);
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}
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else
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{
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currentVC.PresentModalViewController(_picker, true);
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}
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}
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/// <summary>
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/// 选择图片
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/// </summary>
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/// <param name="callback">回调函数</param>
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/// <param name="fileName">文件名</param>
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public static void SelectPicture(Action<string> callback, string fileName, bool isZoom = true)
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{
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_fileName = fileName;
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_callback = callback;
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_picker.SourceType = UIImagePickerControllerSourceType.PhotoLibrary;
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IsZoom = isZoom;
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if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad)
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{
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NSOperationQueue.MainQueue.AddOperation(() =>
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{
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_picker.ModalTransitionStyle = UIModalTransitionStyle.CoverVertical;
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var popover = new UIPopoverController(_picker) { PopoverContentSize = Application.RootFrameLayout.Frame.Size };
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popover.PresentFromRect(new CGRect(95, 235, 300, 300), Application.RootFrameLayout, UIPopoverArrowDirection.Down | UIPopoverArrowDirection.Left, true);
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});
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}
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else
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{
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currentVC.PresentModalViewController(_picker, true);
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}
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}
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//获取当前屏幕显示的viewcontroller
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static UIViewController currentVC
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{
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get
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{
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var rootViewController = UIApplication.SharedApplication.KeyWindow.RootViewController;
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var currentVC = getCurrentVCFrom(rootViewController);
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return currentVC;
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}
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}
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static UIViewController getCurrentVCFrom(UIViewController rootVC)
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{
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UIViewController currentVC;
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if (rootVC.PresentedViewController != null)
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{
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// 视图是被presented出来的
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rootVC = rootVC.PresentedViewController;
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}
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if (rootVC.GetType() == typeof(UITabBarController))
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{
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// 根视图为UITabBarController
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currentVC = getCurrentVCFrom((rootVC as UITabBarController).SelectedViewController);
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}
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else if (rootVC.GetType() == typeof(UINavigationController))
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{
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// 根视图为UINavigationController
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currentVC = getCurrentVCFrom((rootVC as UINavigationController).VisibleViewController);
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}
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else
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{
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// 根视图为非导航类
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currentVC = rootVC;
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}
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return currentVC;
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}
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}
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}
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