动态调整 UICollectionViewCell 的大小 [英] Dynamically resizing a UICollectionViewCell

问题描述

我有一个带有 2 个 UILabel 的 UICollectionView 和一个具有类似布局的 UIImage:

I have a UICollectionView with 2 UILabel and a UIImage with a similar layout:

 --------------------
 |                   |
 |    LABEL1         |
 |    IMAGE          |
 |    LABEL2         |
 |    ......         |
 |    ......         |
 --------------------

Label2 的行数可变，单元格之间不同，我希望能够根据 label2 height 自动调整 UICollectionView 高度，让它自动填充"单元格.在 iOS 中可以做到吗?

Label2 has a variable number of lines, different between cells, and I would like to be able to autosize the UICollectionView height according to label2 height, to let it "autofill" the cell. Is it possible to do it in iOS?

推荐答案

您可以重写UICollectionViewDelegateFlowLayout的以下方法来动态计算 UICollectionViewCell 的高度，根据需要设置常量值.

You can override following method of UICollectionViewDelegateFlowLayout to dynamically calculate height of UICollectionViewCell, set the constant values according to your requirements.

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

    UIFont *fontLabel1 = [UIFont systemFontOfSize:17];
    UIFont *fontLabel2 = [UIFont systemFontOfSize:14];
    int padding = 5;
    int maxWidthOfLabel = 300;
    CGSize maximumLabelSize = CGSizeMake(maxWidthOfLabel, CGFLOAT_MAX);

    NSString *strLabel1 = @"Label one text";// Get text for label 1 at indexPath
    NSString *strLabel2 = @"Label two text";// Get text for label 2 at indexPath

    NSStringDrawingOptions options = NSStringDrawingTruncatesLastVisibleLine |
    NSStringDrawingUsesLineFragmentOrigin;

    NSDictionary *attr1 = @{NSFontAttributeName: fontLabel1};
    NSDictionary *attr2 = @{NSFontAttributeName: fontLabel2};

    // Calculate individual label heights
    CGFloat heightLabel1 = [strLabel1 boundingRectWithSize:maximumLabelSize
                                                options:options
                                             attributes:attr1
                                                context:nil].size.height;
    CGFloat heightLabel2 = [strLabel2 boundingRectWithSize:maximumLabelSize
                                                options:options
                                             attributes:attr2
                                                context:nil].size.height;
    CGSize sizeOfImage = CGSizeMake(50, 50);

    // Calculate height based on all Views (2 Labels + 1 ImageView)
    CGFloat height = heightLabel1+heightLabel2+sizeOfImage.height+2*padding;
    CGFloat width = collectionView.frame.size.width;// Set width
    CGSize size = CGSizeMake(width, height);
    return size;
}

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