iOS - 设置为0时仍然存在UICollectionView间距 - 如何设置单元格之间没有间距

Question

我有一个简单的UICollectionView,我在InterfaceBuilder中设置了0间距但是当我用单元格填充集合视图时,仍然有一些间距.是否有一些特殊而且不是很明显我需要做的是为了实际看到一个带有0间距的集合视图单元格而不是设置为0间距？谢谢.

编辑*一些代码:

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

    UICollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];

    cell.backgroundColor = [UIColor clearColor];

    UILabel *lbl = [[UILabel alloc] initWithFrame:CGRectMake(2, 2, cell.frame.size.width -4, cell.frame.size.height -4)];
    lbl.backgroundColor = [UIColor clearColor];
    lbl.font = [UIFont boldSystemFontOfSize:20];
    lbl.text = [NSString stringWithFormat:@"$%0.0f", [[amountsArray objectAtIndex:indexPath.row] floatValue]];
    lbl.textAlignment = NSTextAlignmentCenter;
    lbl.layer.borderWidth = 1;

    [cell addSubview:lbl];
    [lbl release];

    return cell;
}

Answer 1

查询的简单解决方案.在viewController的.m文件中添加:

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    ProductDetailViewController *HomeVC = [self.storyboard instantiateViewControllerWithIdentifier:@"ProductDetailView"];
    HomeVC.title = @"DemoProject";
    [self.navigationController pushViewController:HomeVC animated:YES];
}

- (UIEdgeInsets)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(0, 0, 0, 0); // top, left, bottom, right
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {

    return 0.0;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return 0.0;
}

Answer 2

你必须创建自定义UICollectionViewLayout.

细胞之间的空间将等于cellSpacing.

final class CustomFlowLayout: UICollectionViewFlowLayout {

    let cellSpacing: CGFloat = 0

    override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        if let attributes = super.layoutAttributesForElements(in: rect) {
            for (index, attribute) in attributes.enumerated() {
                if index == 0 { continue }
                let prevLayoutAttributes = attributes[index - 1]
                let origin = prevLayoutAttributes.frame.maxX
                if (origin + cellSpacing + attribute.frame.size.width < self.collectionViewContentSize.width) {
                    attribute.frame.origin.x = origin + cellSpacing
                }
            }
            return attributes
        }
        return nil
    }

}

Answer 3

Swift 3版@MihirOza的解决方案

适用于水平和垂直集合视图

码

// removing spacing
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
    return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
    return 0.0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 0.0
}

Answer 4

我解决了这个问题,并通过以下方式得到了我想要的布局:

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

UICollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];



    cell.backgroundColor = [UIColor clearColor];

    //clear any contents on the cell
    for (UIView *subView in [cell subviews]) {
    [subView removeFromSuperview];
    }


    //Label to put on the cell
    UILabel *lbl = [[UILabel alloc] initWithFrame:CGRectMake(2, 2, cell.frame.size.width -4, cell.frame.size.height -4)];
    lbl.backgroundColor = [UIColor clearColor];
    lbl.textColor = [UIColor colorWithRed:[CPExtras RGBtoPercent:70] green:[CPExtras RGBtoPercent:92] blue:[CPExtras RGBtoPercent:105] alpha:1];
    lbl.font = [UIFont boldSystemFontOfSize:20];
    lbl.text = @"100";
    lbl.textAlignment = NSTextAlignmentCenter;

    //Give the cell a border
    cell.layer.borderColor = [[UIColor colorWithRed:[CPExtras RGBtoPercent:70] green:[CPExtras RGBtoPercent:92] blue:[CPExtras RGBtoPercent:105] alpha:0.5] CGColor];
    cell.layer.borderWidth = 0.5;


    [cell addSubview:lbl];

    [lbl release];





return cell;
}

在IB中,我对collectionview进行了以下测量设置: