我如何在UICollectionView的一个部分设置单元格间距?我知道有一个属性minimumInteritemSpacing，我已经将它设置为5.0，但间距仍然没有出现5.0。我已经实现了flowout委托方法。
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
return 5.0;
}
我仍然没有得到想要的结果。我认为这是最小间距。有没有什么方法可以设置最大间距?
当前回答
Swift 5 UIKit编程
//Create UICollectionView
lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
//CollectionCellView width autoSize
layout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.register(CustomCollectionViewCell.self, forCellWithReuseIdentifier: cellId)
collectionView.backgroundColor = .clear
collectionView.delegate = self
collectionView.dataSource = self
collectionView.alwaysBounceHorizontal = true
//Add Spacing in each cell
layout.minimumInteritemSpacing = 15
layout.minimumLineSpacing = 15
return collectionView
}()
其他回答
间距的简单代码
let layout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
layout.minimumInteritemSpacing = 10 // Some float value
最流行的答案的Swift版本。单元格之间的空格将等于cellSpacing。
class CustomViewFlowLayout : UICollectionViewFlowLayout {
let cellSpacing:CGFloat = 4
override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
if let attributes = super.layoutAttributesForElementsInRect(rect) {
for (index, attribute) in attributes.enumerate() {
if index == 0 { continue }
let prevLayoutAttributes = attributes[index - 1]
let origin = CGRectGetMaxX(prevLayoutAttributes.frame)
if(origin + cellSpacing + attribute.frame.size.width < self.collectionViewContentSize().width) {
attribute.frame.origin.x = origin + cellSpacing
}
}
return attributes
}
return nil
}
}
试试这个方法:
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout*)collectionViewLayout
insetForSectionAtIndex:(NSInteger)section {
UIEdgeInsets insets = UIEdgeInsetsMake(?, ?, ?, ?);
return insets;
}
Swift 5 UIKit编程
//Create UICollectionView
lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
//CollectionCellView width autoSize
layout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.register(CustomCollectionViewCell.self, forCellWithReuseIdentifier: cellId)
collectionView.backgroundColor = .clear
collectionView.delegate = self
collectionView.dataSource = self
collectionView.alwaysBounceHorizontal = true
//Add Spacing in each cell
layout.minimumInteritemSpacing = 15
layout.minimumLineSpacing = 15
return collectionView
}()
请注意属性名minimumInterItemSpacing。这将是项目之间的最小间距，而不是精确的间距。如果你设置minimumInterItemSpacing为某个值，你可以确保spacing不会小于该值。但有机会获得更高的价值。
实际上，项目之间的间距取决于几个因素itemSize和sectionInset。集合视图根据这些值动态放置内容。所以你不能保证精确的间距。你应该用sectionInset和minimumInterItemSpacing做一些试错。
