Question

在我的项目中，我使用UICollectionView来显示图片，我还在UIImageView中使用UICollectionViewCell。我想要的只是当我点击图像时它应该展开并在全屏显示。为此，我创建了一个新视图，其上需要UIImageView并在UICollectionViewCells上应用TapGesture。展开的图像在下一个视图中打开，但不会在我给出的框架中显示。而当我点击任何图片时，它从集合视图中删除。请告诉我如何重新加载UICollectionViewCells 请建议我如何将图像放在规定的框架上。我正在分享我的代码

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];

    imgview = (UIImageView *)[cell viewWithTag:100];
    imgview = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,160, 160)];

    imgview.image = [UIImage imageNamed:[imagearray objectAtIndex:indexPath.row]];
    //cell.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:[imagearray objectAtIndex:indexPath.row]]];
    [cell.contentView addSubview:imgview];

    UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(expandImage:)];
    tapped.numberOfTapsRequired = 1;
    [imgview setUserInteractionEnabled:YES];
    imgview.tag = indexPath.row;
    [imgview addGestureRecognizer:tapped];

    [cell.contentView addSubview:imgview];

    return cell;
}

-(void)expandImage:(UITapGestureRecognizer*)recogniser
{
    UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(0, 50, self.view.frame.size.width , self.view.frame.size.height)];
    view1.backgroundColor = [UIColor greenColor];
    [self.view addSubview:view1];

    UIButton *closeButton = [[UIButton alloc]initWithFrame:CGRectMake(310, 10, 50, 40)];
    [closeButton setTitle:@"Close" forState:UIControlStateNormal];
    [closeButton addTarget:self action:@selector(Closetab) forControlEvents:UIControlEventTouchUpInside];
    [view1 addSubview:closeButton];

    UIImageView *photoView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 70, self.view.frame.size.width, self.view.frame.size.height-200)];
    [photoView setBackgroundColor:[UIColor blueColor]];
    [view1 addSubview:photoView];
    photoView.accessibilityIdentifier = @"nature2.png";

    UIImageView *photoView1 = (UIImageView*)recogniser.view;
    photoView1.accessibilityIdentifier = @"nature2.png";

    //photoView.clipsToBounds = YES;

    // photoView.accessibilityIdentifier = @"apple1.png";

    photoView1.contentMode =  UIViewContentModeScaleAspectFill;

    //photoView1.clipsToBounds = YES;
    [view1 addSubview:photoView1];  
}

Answer 1

实现这一目标的一种更简单的方法是推送到显示全屏图片的新视图，而不是将其添加为子视图。

您还可以自定义导航控制器的过渡动画以满足您的需求。

Answer 2

好的，不要把任何事情视为理所当然，因为有一件事我确定，看着那段代码让我感到困惑。但这是我如何看待它，以及出了什么问题：

    UIImageView *photoView1 = (UIImageView*)recogniser.view;
    [view1 addSubview:photoView1];

使用这两行，您将从单元格中取出视图并将其放入此新视图中1。因此，只需分配新的UIImageVIew并设置其图像就可以解决它。还有一些建议：

    imgview = (UIImageView *)[cell viewWithTag:100];
    imgview = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,160, 160)];

这里第一行代码没有做任何事情。您设置对象，然后再次设置该对象。接下来就是不要在 cellForItemAtIndexPath 中添加子视图而不删除之前添加的子视图。当单元格出列时，您反复使用相同的单元格，因此您将通过将视图堆叠在一起来创建内存泄漏。您甚至可以通过使用自己的UIImageView创建自定义单元格来省略所有添加内容。接下来不需要使用手势识别，CollectionView有这个代表：

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

您可以用它替换 expandImage 方法，只需从 imagearray 获取图片即可。最后，这个美丽的图书馆随时可供你使用，MHFacebookImageViewer。

Answer 3

所以最好在窗口中添加视图。因此它会全屏显示。使用以下代码。

UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(0, 50, self.view.frame.size.width , self.view.frame.size.height)];
    view1.backgroundColor = [UIColor greenColor];
    [self.view.window addSubview:view1];

Answer 4

在imageview

上添加navigationController.view

UIImageView *imgView =[[UIImageView alloc]initWithFrame:self.view.bounds];
[self.navigationController.view addSubview:imgView];

Answer 5

我通过此代码完成了上述操作首先添加了点击手势然后应用以下代码

-(void)expandImage:(UITapGestureRecognizer*)recogniser
{

    view1.hidden = NO;

    UIImageView *photoView1 = (UIImageView*)recogniser.view;
    photoView1.frame = CGRectMake(0, 0, self.view.frame.size.width, 510);
    photoView1.accessibilityIdentifier = @"nature2.png";

    //photoView.clipsToBounds = YES;

    // photoView.accessibilityIdentifier = @"apple1.png";

    photoView1.contentMode =  UIViewContentModeScaleAspectFill;

    photoView1.clipsToBounds = YES;

    [view1 addSubview:photoView1];
    }

在UICollectionView中点击时如何将图像扩展为完整视图？

5 个答案: