动态高度的UICollectionViewCell取决于内容

Question

您好我使用UICollectionView和UICollectionViewCell我需要一个图像（图标）一个标题和一些描述。我是新的IOS开发我想要UICollectionViewCell细胞高度取决于内容，因为可能是标题和图像将有特定的高度，但描述有不同的高度。任何人都可以帮助我计算描述标签的高度。我应该使用textview来描述吗？

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。

尝试使用类似这样的东西。

- (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-(void)viewDidLoad方法创造一些私人UITextView成员不是每次创建它的heightForRow委托方法调用。