Question

嗨，我正在使用UICollectionView，在UICollectionViewCell中我需要一个图像（图标）一个标题和一些描述。我是IOS开发的新手，我希望UICollectionViewCell单元格高度取决于内容，因为标题和图像可能具有特定的高度，但描述具有不同的高度。任何人都可以帮我计算描述标签的高度。我应该使用textview进行描述吗？

NSDictionary *service1 = [NSDictionary dictionaryWithObjectsAndKeys:
                 @"Lorem ipsum dolor sit",@"title",
                 @"Lorem ipsum dolor sit is simply dummy text Lorem ipsum dolor sit is simply dummy text Lorem ipsum dolor sit is simply dummy text Lorem ipsum dolor sit is simply dummy text Lorem ipsum dolor sit is simply dummy text",@"Description",
                 @"image1.png",@"image",
                              nil
                ];
     NSDictionary *service2 = [NSDictionary dictionaryWithObjectsAndKeys:
                @"Lorem ipsum dolor sit", @"title",
                @"Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit Lorem ipsum dolor sit",@"Description",
                 @"image2.png",@"image",
                 nil
                               ];
dataarray = [[NSMutableArray alloc] initWithObjects:service1, service2, nil];


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{

    static NSString *identifier = @"Cell";
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath] ;
    UIImage * img = [UIImage imageNamed:[[dataarray objectAtIndex:indexPath.row] objectForKey:@"image"]];
    UIImageView* iv = [[UIImageView alloc] initWithFrame:CGRectMake(10,10,70,70)];
    iv.image = img;

    UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 90, 50, 20)];

    [titleLabel setText:[[dataarray objectAtIndex:indexPath.row] objectForKey:@"title"]];

    titleLabel.textColor = [UIColor blackColor];
    titleLabel.font = [UIFont fontWithName:@"Arial" size:8.5];
    titleLabel.backgroundColor = [UIColor clearColor];
    titleLabel.textAlignment = NSTextAlignmentLeft;

    [cell addSubview:titleLabel];


    CGRect screenRect = [[UIScreen mainScreen] bounds];
    CGFloat screenWidth = screenRect.size.width;

    UILabel *desclabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, screenWidth-20, 120)];

    [desclabel setText:[[dataarray objectAtIndex:indexPath.row] objectForKey:@"Description"]];

    titleLabel.textColor = [UIColor blackColor];
    titleLabel.font = [UIFont fontWithName:@"Arial" size:8.5];
    titleLabel.backgroundColor = [UIColor clearColor];
    titleLabel.textAlignment = NSTextAlignmentLeft;
    [titleLabel sizeToFit];

    [cell addSubview:titleLabel];
    [cell addSubview:desclabel];
    [cell addSubview:iv];

    return cell;

}

- (CGSize)collectionView:(UICollectionView *)collectionView
                  layout:(UICollectionViewLayout *)collectionViewLayout
  sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{

    // Adjust cell size for orientation
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    CGFloat screenWidth = screenRect.size.width;
    if (UIDeviceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation])) {

        return CGSizeMake(screenWidth-10, 170.0f);
    }
    return CGSizeMake(screenWidth-10, 190.0f);
}

Answer 1

好的，现在我明白了。您需要动态计算多行UITextView高度，并根据它增加默认的UITableViewCell行高。

尝试使用类似的东西。

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath)path
{
  // take the text value
  NSString *description = service1[@"title"];
  // initial rect value
  CGRect textFrame = CGRectMake(0,0,cellWidth,10000); // width value is enough for this operation
  UITextView *myTextView = [[UITextView alloc] initWithFrame:textFrame]; // create textview
  // set text view attributes as multiline, font, font size etc.
  myTextView.text = description;
  CGSize size = [myTextView sizeThatFits:myTextView.frame.size]; // that's all
  CGFloat height = size.height + someDefaultCellHeight;
  return height;
}

您可以在UITextView方法中创建一些私有-(void)viewDidLoad成员，以便每次heightForRow委托方法调用时都不创建它。

UICollectionViewCell的动态高度取决于内容

1 个答案: