iphone - segue通过后图片将不会显示

Question

如标题所述，我试图在UIImageview中显示UIImage，问题是它不会显示。在我展示它之前，我从另一个角度通过了segue。当我断点时，我看到分配了UIImage但没有图片显示，我尝试将其设置为静态图片，并且效果很好。

相关代码应为...

在FirstViewController.m中

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

    UIImage* img = [info objectForKey:UIImagePickerControllerOriginalImage];

    if (picker.sourceType == UIImagePickerControllerSourceTypePhotoLibrary) {
        NSLog(@"Bild hämtad!");
        [self moveImage];
    }
    else
    {
    UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), Nil);
    }

    [picker dismissModalViewControllerAnimated:YES];
    [MBProgressHUD showHUDAddedTo:self.view animated:YES];
}

- (void)image: (UIImage *)image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo{

    if (!error) {
        NSLog(@"Bild sparad!");
        [self moveImage];
    }
    else{
        NSLog(@"%@",error);
    }
}
-(void)moveImage
{   
    [self performSegueWithIdentifier:@"ImageEdit" sender:self];
    [MBProgressHUD hideHUDForView:self.view animated:YES];
    NSLog(@"Bild Flyttad!");

}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:self
{
    if ([[segue identifier] isEqualToString:@"ImageEdit"])
    {
        [segue.destinationViewController setMImage:image];
    }

}

在ImageEditController.m中

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [imageView setImage:_mImage];
    NSLog(@"Bild Visas!");
}

我知道有很多代码，但是我认为发布多于少总比更好。

Answer 1

您是否曾经初始化过imageView？

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    imageView = [[UIImageView alloc] init];
    [imageView setImage:_mImage];
    NSLog(@"Bild Visas!");
}

如果从未初始化过该函数，则对其进行的任何函数调用都只会静默失败(在nil指针上调用一个函数不会执行任何操作)。