iOS / ObjectiveC：我尝试用包含本地图像的图像视图打开一个视图控制器，但它显示一个白页

Question

我准确地说，当我使用调试器时，我可以在图像视图中看到图像。 为什么它显示一个白页？ （我可以看到后退按钮）

- (void) openIMAGE:(NSIndexPath *) indexPath
{
    NSString *filePath = [menuPath stringByAppendingPathComponent:contentsList[indexPath.row]];
    


    UIViewController* imageViewController = [UIViewController new];
    imageViewController.view.backgroundColor = [UIColor whiteColor];
    //0,21,73,30
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button addTarget:self
               action:@selector(backBtn:)
     forControlEvents:UIControlEventTouchUpInside];
    [button setTitle:@"Back" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    button.frame = CGRectMake(0.0, 21.0, 73.0, 30.0);

    UIImageView *imageView= [UIImageView new];
    imageView.image = [UIImage imageWithContentsOfFile: filePath];
    
//    UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y + 48.0, self.view.frame.size.width, self.view.frame.size.height - 48.0)];


    [imageViewController.view addSubview:imageView];
    [imageViewController.view addSubview:button];
    
    
    [self.navigationController pushViewController:imageViewController animated:YES];
    }

Answer 1

UIImageView *imageView= [UIImageView new];
imageView.image = [UIImage imageWithContentsOfFile: filePath];
[imageViewController.view addSubview:imageView];

与您的按钮不同，您的

imageView

没有框架，也没有尺寸。因此它是左上角的一个无穷小点，你看不到它。

除此之外，您的代码很糟糕。永远不要从另一个视图控制器填充视图控制器的视图。制作一个图像视图控制器class并让它填充自身.