ios - 图像选择器并将选择的图像推送到新的视图控制器

Question

我正在尝试使用相机拍照，然后将所选照片传递到另一个视图控制器。我使用 segue 将图像推送到下一个，但它似乎没有得到图像。

杂注标记 - UIImagePickerDelegate 方法

//delegate methode will be called after picking photo either from camera or library
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self dismissViewControllerAnimated:YES completion:nil];

    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

    [self.collectedImageView setImage:image];

    [self performSegueWithIdentifier:@"photoArea" sender:self];
}

pragma mark - 为 Segue 做准备

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    MESSelectPhotoAreaViewController *photoAreaVC = [segue destinationViewController];

    photoAreaVC.photoImageView.image = self.collectedImageView.image;
}

Answer 1

我猜“ photoAreaVC.photoImageView”仍然为空，因为destinationViewController 还没有完全实例化。

prepareForSegue:您可以通过在您的 " " 方法中添加这一行来确认这一点：

if (photoAreaVC.photoImageView == NULL)
    NSLog( @"photoImageView doesn't yet exist" );

您需要找到一个位置（例如UIImage，目标视图控制器中的“”属性，也许？）来临时存储该图像，直到“ viewDidAppear:”或“ viewWillAppear:”被调用，“ photoImageView”属性指向有效对象的地方。