-  ( void )takePhotoBtnTapped : (UIButton  * )sender  {
   //Show Action Sheet: 1. Take Photo 2. Select Photo From Album
  UIActionSheet  *photoBtnActionSheet  =
   [ [UIActionSheet alloc ] initWithTitle :nil
                              delegate :self
                     cancelButtonTitle :@ "Cancel"
                destructiveButtonTitle :nil
                     otherButtonTitles :@ "Photo Library" ,@ "Take Photo" , nil ] ;
   [photoBtnActionSheet setActionSheetStyle :UIActionSheetStyleBlackOpaque ] ;
   [photoBtnActionSheet showInView : [self. view window ] ] ;
}

UIActionSheetDelegate
UIImagePickerControllerDelegate
UINavigationControllerDelegate

-  ( void )actionSheet : (UIActionSheet  * )actionSheet clickedButtonAtIndex : (NSInteger )buttonIndex  {
  NSLog (@ "Action Sheet Button Index: %d" ,buttonIndex ) ;
   if  (buttonIndex  ==  0 )  {
     //Show Photo Library
    @try  {
       if  ( [UIImagePickerController isSourceTypeAvailable :UIImagePickerControllerSourceTypeSavedPhotosAlbum ] )  {
        UIImagePickerController  *imgPickerVC  =  [ [UIImagePickerController alloc ] init ] ;
         [imgPickerVC setSourceType :UIImagePickerControllerSourceTypePhotoLibrary ] ;
         [imgPickerVC. navigationBar setBarStyle :UIBarStyleBlack ] ;
         [imgPickerVC setDelegate :self ] ;
         [imgPickerVC setAllowsEditing :NO ] ;
         //显示Image Picker
         [self presentModalViewController :imgPickerVC animated :NO ] ;
       } else  {
        NSLog (@ "Album is not available." ) ;
       }
     }
    @catch  (NSException  *exception )  {
       //Error
      NSLog (@ "Album is not available." ) ;
     }
   }
   if  (buttonIndex  ==  1 )  {
     //Take Photo with Camera
    @try  {
       if  ( [UIImagePickerController isSourceTypeAvailable :UIImagePickerControllerSourceTypeCamera ] )  {
        UIImagePickerController  *cameraVC  =  [ [UIImagePickerController alloc ] init ] ;
         [cameraVC setSourceType :UIImagePickerControllerSourceTypeCamera ] ;
         [cameraVC. navigationBar setBarStyle :UIBarStyleBlack ] ;
         [cameraVC setDelegate :self ] ;
         [cameraVC setAllowsEditing :NO ] ;
         //显示Camera VC
         [self presentModalViewController :cameraVC animated :NO ] ;
        
       } else  {
        NSLog (@ "Camera is not available." ) ;
       }
     }
    @catch  (NSException  *exception )  {
      NSLog (@ "Camera is not available." ) ;
     }
   }
}

-  ( void )imagePickerControllerDidCancel : (UIImagePickerController  * )picker {
  NSLog (@ "Image Picker Controller canceled." ) ;
   //Cancel以后将ImagePicker删除
   [self dismissModalViewControllerAnimated :NO ] ;
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
  NSLog(@"Image Picker Controller did finish picking media.");
  //TODO:选择照片或者照相完成以后的处理
  
  [self dismissModalViewControllerAnimated:NO];
}