Question

正如标题所说我试图在UIImageview中显示UIImage，问题是它不会显示。在我展示它之前，我通过另一个视图的segue传递它。当我断点时，我看到UIImage被分配，但没有图片显示，我已经尝试将其设置为静态图片，并且工作正常。

相关代码应该是......

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，但我认为发布的内容远远超过一点点更好。

Answer 1

你有没有初始化imageView？

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

如果它从未被初始化，那么对它的任何函数调用都将无声地失败（在nil指针上调用函数不会做任何事情）。

在segue过世后，图片不会显示出来

1 个答案: