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
在头文件中定义UICollectionViewDelegateFlowLayout协议。
实现UICollectionViewDelegateFlowLayout协议的如下方法:
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(5, 5, 5, 5);
}
点击这里查看苹果文档的UIEdgeInsetMake方法。
其他回答
试试下面的代码，确保每个项目之间的间距为5px:
- (UIEdgeInsets)collectionView:(UICollectionView *) collectionView
layout:(UICollectionViewLayout *) collectionViewLayout
insetForSectionAtIndex:(NSInteger) section {
return UIEdgeInsetsMake(0, 0, 0, 5); // top, left, bottom, right
}
- (CGFloat)collectionView:(UICollectionView *) collectionView
layout:(UICollectionViewLayout *) collectionViewLayout
minimumInteritemSpacingForSectionAtIndex:(NSInteger) section {
return 5.0;
}
Swift 3版本
简单地创建一个UICollectionViewFlowLayout子类并粘贴这个方法。
override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
guard let answer = super.layoutAttributesForElements(in: rect) else { return nil }
for i in 1..<answer.count {
let currentAttributes = answer[i]
let previousAttributes = answer[i - 1]
let maximumSpacing: CGFloat = 8
let origin = previousAttributes.frame.maxX
if (origin + maximumSpacing + currentAttributes.frame.size.width < self.collectionViewContentSize.width && currentAttributes.frame.origin.x > previousAttributes.frame.origin.x) {
var frame = currentAttributes.frame
frame.origin.x = origin + maximumSpacing
currentAttributes.frame = frame
}
}
return answer
}
在头文件中定义UICollectionViewDelegateFlowLayout协议。
实现UICollectionViewDelegateFlowLayout协议的如下方法:
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(5, 5, 5, 5);
}
点击这里查看苹果文档的UIEdgeInsetMake方法。
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
}()
我知道这个话题很老了，但如果有人还需要正确答案，你需要什么:
Override standard flow layout. Add implementation like that: - (NSArray *) layoutAttributesForElementsInRect:(CGRect)rect { NSArray *answer = [super layoutAttributesForElementsInRect:rect]; for(int i = 1; i < [answer count]; ++i) { UICollectionViewLayoutAttributes *currentLayoutAttributes = answer[i]; UICollectionViewLayoutAttributes *prevLayoutAttributes = answer[i - 1]; NSInteger maximumSpacing = 4; NSInteger origin = CGRectGetMaxX(prevLayoutAttributes.frame); if(origin + maximumSpacing + currentLayoutAttributes.frame.size.width < self.collectionViewContentSize.width) { CGRect frame = currentLayoutAttributes.frame; frame.origin.x = origin + maximumSpacing; currentLayoutAttributes.frame = frame; } } return answer; }
其中maximumSpacing可以设置为您喜欢的任何值。这个技巧保证了单元格之间的空间将等于maximumSpacing!!
