#pragma mark - UIImagePickerControllerDelegate 代理方法

// 儲存圖片後到相簿後，呼叫的相關方法，檢視是否儲存成功

- (void) imageWasSavedSuccessfully:(UIImage *)paramImage didFinishSavingWithError:(NSError *)paramError contextInfo:(void *)paramContextInfo{

    if (paramError == nil){

        NSLog(@"Image was saved successfully.");

    } else {

        NSLog(@"An error happened while saving the image.");

        NSLog(@"Error = %@", paramError);

    }

}

// 當得到照片或者視訊後，呼叫該方法

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

    NSLog(@"Picker returned successfully.");

    NSLog(@"%@", info);

    NSString *mediaType = [infoobjectForKey:UIImagePickerControllerMediaType];

    // 判斷獲取型別：圖片

    if ([mediaType isEqualToString:( NSString *)kUTTypeImage]){

        UIImage *theImage = nil;

        // 判斷，圖片是否允許修改

        if ([picker allowsEditing]){

            //獲取使用者編輯之後的影象

            theImage = [infoobjectForKey:UIImagePickerControllerEditedImage];

        } else {

            // 照片的元資料引數

            theImage = [infoobjectForKey:UIImagePickerControllerOriginalImage];

        }

        // 儲存圖片到相簿中

        SEL selectorToCall = @selector(imageWasSavedSuccessfully:didFinishSavingWithError:contextInfo:);

        UIImageWriteToSavedPhotosAlbum(theImage,self,selectorToCall, NULL);

    }else if ([mediaType isEqualToString:(NSString*)kUTTypeMovie]){

        // 判斷獲取型別：視訊

        //獲取視訊檔案的url

        NSURL* mediaURL = [infoobjectForKey:UIImagePickerControllerMediaURL];

        //建立ALAssetsLibrary物件並將視訊儲存到媒體庫

        // Assets Library 框架包是提供了在應用程式中操作圖片和視訊的相關功能。相當於一個橋樑，連結了應用程式和多媒體檔案。

        ALAssetsLibrary *assetsLibrary = [[ALAssetsLibraryalloc] init];

        // 將視訊儲存到相簿中

        [assetsLibrary writeVideoAtPathToSavedPhotosAlbum:mediaURL

                                         completionBlock:^(NSURL *assetURL, NSError *error) {

                                              if (!error) {

                                                 NSLog(@"captured video saved with no error.");

                                              }else{

                                                  NSLog(@"error occured while saving the video:%@", error);

                                              }

                                          }];

        [assetsLibrary release];

    }

    [picker dismissModalViewControllerAnimated:YES];

}

// 當用戶取消時，呼叫該方法

- (void)imagePickerControllerDidCancel:(UIImagePickerController*)picker{

    [picker dismissModalViewControllerAnimated:YES];

}