【轉】 【iPhone】UIImagePickerController 查看圖片，視頻，錄像

轉載自 hh20040410

最終編輯 hh20040410

UIImagePickerController －－ the only sanctioned way to get videos/movies or images/pictures on supported devices 用 UIImagePickerController 選擇、顯示圖片或視頻， 主要注意 UIImagePickerController 幾個屬性的設置 一：UI 顯示樣式，顯示的格式確定 1： sourceType   @property(nonatomic) UIImagePickerControllerSourceType sourceType   enum  { UIImagePickerControllerSourceTypePhotoLibrary, UIImagePickerControllerSourceTypeCamera, UIImagePickerControllerSourceTypeSavedPhotosAlbum }; typedef NSUInteger UIImagePickerControllerSourceType;   sourceType用來 確定用戶界面顯示的樣式： 共三種格式（模擬器上的效果圖） UIImagePickerControllerSourceTypePhotoLibrary, UIImagePickerControllerSourceTypeCamera,   UIImagePickerControllerSourceTypeSavedPhotosAlbum   為了區分是否支持視頻格式，一般要用到下面這個函數，以便確定mediaTypes。 + (BOOL)isSourceTypeAvailable:(UIImagePickerControllerSourceType)sourceType   2: mediaTypes   @property(nonatomic,copy) NSArray *mediaTypes   mediaTypes用來確定再picker裡顯示那些類型的多媒體文件，圖片？ 視頻？ + (NSArray *)availableMediaTypesForSourceType:(UIImagePickerControllerSourceType)sourceType   二：選取動作處理 UIImagePickerControllerDelegate  通過代理來完成用戶在選中圖片，或者choose視頻時的處理方式： 共有三個可選的代理方法 – imagePickerController:didFinishPickingMediaWithInfo: – imagePickerControllerDidCancel:  – imagePickerController:didFinishPickingImage:editingInfo: Deprecated in iPhone OS 3.0   - (void)imagePickerController: (UIImagePickerController *)picker didFinishPickingMediaWithInfo: (NSDictionary *) info info中包括選取的照片，視頻的主要信息 NSString *const UIImagePickerControllerMediaType;選取的類型 public.image public.movie NSString *const UIImagePickerControllerOriginalImage; 修改前的UIImage object. NSString *const UIImagePickerControllerEditedImage; 修改後的UIImage object. NSString *const UIImagePickerControllerCropRect; 原始圖片的尺寸NSValue object containing a CGRect data type NSString *const UIImagePickerControllerMediaURL; 視頻在文件系統中的NSURL地址 保存視頻主要時通過獲取其NSURL然後轉換成 NSData 實例代碼如下： - ( void ) pickImage: ( id ) sender { UIImagePickerController *ipc = [[ UIImagePickerController alloc ] init ]; if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypePhotoLibrary ]){ ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary ; ipc.mediaTypes =[ UIImagePickerController availableMediaTypesForSourceType :ipc. sourceType ]; } ipc.delegate = self ; ipc. allowsImageEditing = NO ; [ self presentModalViewController :ipc animated : YES ]; } - ( void )imagePickerController:( UIImagePickerController *)picker didFinishPickingMediaWithInfo:( NSDictionary *)info { NSString *mediaType = [info objectForKey : UIImagePickerControllerMediaType ]; if ([mediaType isEqualToString : @"public.image" ]){ // UIImage *selectedImage = [info objectForKey:UIImagePickerControllerOriginalImage]; UIImage *image = [info objectForKey : @"UIImagePickerControllerOriginalImage" ]; NSLog ( @"found an image" ); [ UIImageJPEGRepresentation (image, 1.0f ) writeToFile :[ self findUniqueSavePath ] atomically : YES ]; SETIMAGE (image); CFShow ([[ NSFileManager defaultManager ] directoryContentsAtPath :[ NSHomeDirectory () stringByAppendingString : @"/Documents" ]]); } else if ([mediaType isEqualToString : @"public.movie" ]){ NSURL *videoURL = [info objectForKey : UIImagePickerControllerMediaURL ]; NSLog ( @"found a video" ); NSData *webData = [ NSData dataWithContentsOfURL :videoURL]; //NSData *video = [[NSString alloc] initWithContentsOfURL:videoURL]; [webData writeToFile :[ self findUniqueMoviePath] atomically : YES ]; CFShow ([[ NSFileManager defaultManager ] directoryContentsAtPath :[ NSHomeDirectory () stringByAppendingString : @"/Documents" ]]); // NSLog(videoURL); } [picker dismissModalViewControllerAnimated : YES ]; }