Question

我正在尝试调整单元格高度以适应UIImages，问题是看起来UIImage似乎没有填充collectionView单元格。正如你在这个

上看到的那样

图片：http://oi61.tinypic.com/98d3zd.jpg

看起来细胞已调整，但图像填充不正确以填充细胞？

cellheights 首先，我创建了一个循环，如果cellWidth为140，则计算新的高度，这是所有情况。

for (int i = 0; i < [homesDic count]; i++) {

    UIImage *originalImage = [[homesDic objectAtIndex:i] objectForKey:@"image"];

    CGFloat originalHeight = originalImage.size.height;
    CGFloat originalWidth = originalImage.size.width;
    CGFloat wantedWidth = 140;
    float wantedHeight = (originalHeight*wantedWidth)/originalWidth;
    [_cellHeights addObject:@(wantedHeight)];
}

然后我将一个imageView插入到collectionView单元格中，并设置框架并将单元格高度设置为等于cellHight数组中的imageheight。

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

    FRGWaterfallCollectionViewCell *waterfallCell = [collectionView dequeueReusableCellWithReuseIdentifier:WaterfallCellIdentifier indexPath];
    waterfallCell.lblTitle.text = [NSString stringWithFormat: @"Item %d", indexPath.item];

    waterfallCell.bottomView.backgroundColor = [UIColor colorWithRed:0.184 green:0.192 blue:0.196 alpha:0.7];
    waterfallCell.homeImage.image = [[homesDic objectAtIndex:indexPath.item] objectForKey:@"image"];

    waterfallCell.homeImage.frame = CGRectMake(0, 0, [self.cellHeights[indexPath.item] floatValue], waterfallCell.frame.size.width);
    return waterfallCell;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView
                   layout:(FRGWaterfallCollectionViewLayout *)collectionViewLayout
 heightForItemAtIndexPath:(NSIndexPath *)indexPath {

    return [[self.cellHeights objectAtIndex:indexPath.item] floatValue];
}

Answer 1

要设置单元格大小，您应该使用collectionView：layout：sizeForItemAtIndexPath方法，试试这个：

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    // Get reference to your image base on indexPath here (I assume you have one section and indexPath.row refer to right image) adjust if needed:
    UIImage *originalImage = [[homesDic objectAtIndex: indexPath.row] objectForKey:@"image"];

    CGSize imgSize = originalImage.size;
    //Adjust if needed
    imgSize.height += 20; 
    imgSize.width += 20;

    return imgSize;
}

如果您需要单元格，页眉和页脚之间的间距，请使用以下方法：

- (UIEdgeInsets)collectionView:
(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(20, 10, 20, 10); 
}

希望这就是你要找的东西

调整UICollectionView大小以适合UIImage

1 个答案: