ios - 如何设置UICollectionViewCell大小

Question

我使用了UICollectionView并在单元格中设置了图像。我希望单元格大小为width = view/2和hight = view/3。以及顶部margin =8，right = 8和left = 8。我附上了图片，请看图片。我想要这样，请查看图片。
我的密码

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return img_ary.count;
}


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = @"Cell";


category_cell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
cell.img_view.image = [UIImage imageNamed:[img_ary objectAtIndex:indexPath.row]];


return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
// [self performSegueWithIdentifier:@"showRecipeDetails" sender:self];


}

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

}

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
CGFloat widthOfCell =(self.view.frame.size.width-30)/2;
CGFloat heightOfCell =(self.view.frame.size.height-30)/4;
CGSize returnValue = CGSizeMake(widthOfCell, heightOfCell);
returnValue.height += 5;
returnValue.width += 5;
return returnValue;

}

IMAGE: I want to likes this please see
我尝试了很多次，使用了更多方法，但没有设置像附加图像那样的单元格。请提出我该怎么做。谢谢

Answer 1

你有没有尝试过

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

    CGSize defaultSize = CGSizeMake((_collectionViewSongs.frame.size.width/2)-10, (_collectionViewSongs.frame.size.width/2)-10);


    return defaultSize;
}