UICollectionView设置item(cell)之间间距为0(紧挨在一起的效果)

　UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];

self.layout = layout;

// 设置每格的大小

layout.itemSize = CGSizeMake(DD_SCREEN_WIDTH * 0.5, 80);

// 上左下右间距

layout.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0);

layout.minimumLineSpacing = 0;

layout.minimumInteritemSpacing = 0;

return [self initWithCollectionViewLayout:layout];

注意: minimumInteritemSpacing, sectionInset这两个属性是关联的, 必须设置准确