IOS擷取攝像和本地中的資源

上傳檔案時，我們都的從本地中選擇或用相機來拍攝得到檔案。

一個上傳按鈕，單擊事件

 1 -(IBAction)btnClick{ 2    UIActionSheet* actionSheet = [[UIActionSheet alloc] 3                                                initWithTitle:@"請選擇檔案來源" 4                                                     delegate:self 5                                        cancelButtonTitle:@"取消" 6                                 destructiveButtonTitle:nil 7                                        otherButtonTitles:@"照相機",@"攝像機",@"本地相簿",@"本地視頻",nil]; 8             [actionSheet showInView:self.view]; 9             [actionSheet release];10 }

點擊按鈕觸發的btnClick事件後將會彈出一個如下的選擇筐：

接下來將要為UIActionSheet實現其中的委託了。

 1 #pragma mark - 2 #pragma UIActionSheet Delegate 3 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex 4 {    5     NSLog(@"buttonIndex = [%d]",buttonIndex); 6     switch (buttonIndex) { 7         case 0://照相機 8             {10                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];11                 imagePicker.delegate = self;12                 imagePicker.allowsEditing = YES;13                 imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;14                 imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil];15                 [self presentModalViewController:imagePicker animated:YES];16                 [imagePicker release];17             }18             break;19         case 1://攝像機20             {22                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];23                 imagePicker.delegate = self;24                 imagePicker.allowsEditing = YES;25                 imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;26                 imagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];27                 imagePicker.videoQuality = UIImagePickerControllerQualityTypeLow;28                 [self presentModalViewController:imagePicker animated:YES];29                 [imagePicker release];30             }31             break;32         case 2://本地相簿33             {35                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];36                 imagePicker.delegate = self;37                 imagePicker.allowsEditing = YES;38                 imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;39                 imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil];40                 [self presentModalViewController:imagePicker animated:YES];41                 [imagePicker release];42             }43             break;44         case 3://本地視頻45             {47                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];48                 imagePicker.delegate = self;49                 imagePicker.allowsEditing = YES;50                 imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;51                 imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];52                 [self presentModalViewController:imagePicker animated:YES];53                 [imagePicker release];54             }55             break;56         default:57             break;58     }59 }

實現了UIActionSheet的委託後，要發現，我們使用了UIImagePickerController，這個類將幫我們實現選取檔案，開啟對應的選取方式。比如當ButtonIndex為0的時候，它將幫我們開啟照相機，我們可以使用相機拍攝照片作為上傳的選取檔案。因此，在這裡我們還要實現UIImagePickerController的委託：

 1 #pragma mark -  2 #pragma UIImagePickerController Delegate 3 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 4 { 5     if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString*)kUTTypeImage]) { 6         UIImage  *img = [info objectForKey:UIImagePickerControllerEditedImage]; 7         self.fileData = UIImageJPEGRepresentation(img, 1.0); 8     } else if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString*)kUTTypeMovie]) { 9         NSString *videoPath = [[info objectForKey:UIImagePickerControllerMediaURL] path];10         self.fileData = [NSData dataWithContentsOfFile:videoPath]; 11     }12     [picker dismissModalViewControllerAnimated:YES];13 }14 15 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 16 {17     [picker dismissModalViewControllerAnimated:YES];18 }

之後，你選取的檔案便儲存在了filedata中。就可以隨時過來調用了。