UICollectionViewCell 不按常理流动

Question

我设置了我的 UICollectionView 的委托方法：

#pragma mark - collectionView delegate

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {

    return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {


    //CGPoint point = self.collectionView.frame.origin;
    //CGRect rect = CGRectMake(point.x, point.y, self.collectionView.bounds.size.width, 70*2);


    // height

    /*_heightOfCollectionView.constant = kHeight_Collection_Cell * 6;

    _heightOfContents.constant = collectionView.frame.origin.y + 230 + _heightOfCollectionView.constant;*/

    return 12;//_recommendDataArr.count;


}

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


    float width = (self.view.bounds.size.width / 2);
    float height = 89; // 89

    return CGSizeMake(width, height);
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
    return 0;
}


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

    HomeGMCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"HomeGMCell" forIndexPath:indexPath];

    if (cell == nil) {

        cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"HomeGMCell" forIndexPath:indexPath];
    }



    return cell;
}

minimumLineSpacingForSectionAtIndex 是 0:

你看我 return 单元格的宽度是：

(self.view.bounds.size.width / 2)  // attention: no matter is `(self.view.bounds.size.width / 2) - ?(?=1,2,3,4)` it all get the below issue:

但我得到的结果是：

没有流到2列。它流向一个流。

但是如果我在sizeForItemAtIndexPath方法中设置单元格的大小宽度(self.view.bounds.size.width / 2) - 5，我会得到下面的效果：

它显示了两个cols，这是我的要求，但是还有一个问题是，右边有一个10px的space。

如何在 UICollectionView 中避免这个问题？

Answer 1

添加此填充方法。

 - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
    return  CGSizeMake(SCREEN_WIDTH/2 -5, 89);
}

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

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{
    return 10.0f;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
    return 10.0f;
}

UICollectionViewCell 不按常理流动

The UICollectionViewCell do not flow according to common sense

ios

uicollectionview

uicollectionviewlayout