Answer 1:

这是改变UICollectionView部分颜色有很大的教程：

更新的链路，由于用户@casamia

http://www.ericjchapman.com/jekyll/update/ios/2014/11/10/ios-changing-section-background-color-in-UICollectionView.html

基本上，我们将不得不继承UICollectionViewLayoutAttributes ， UICollectionReusableView和UICollectionViewLayout为了创建一个实例UICollectionReusableView作为节的背景图。

这是他的结果是：

请按照链接查看更多细节说明。

Answer 2:

我们的想法是覆盖UICollectionViewLayoutAttributes添加颜色属性。然后覆盖UICollectionReusableView应用颜色到视图背景。

https://github.com/strawberrycode/SCSectionBackground

Answer 3:

我没有试过了没有，但在我看来，你需要使用装饰的观点，如果你想你的细胞后面的背景（如在图书应用下架）。我想你应该能够对各部分不同的看法，并使用委托方法设置它们layoutAttributesForDecorationViewOfKind:atIndexPath:

Answer 4:

在集合视图中的每个部分可以有补充意见，所以提出补充意见每一部分然后设置背景颜色为补充的意见，而不是部分的细胞。我希望这将有助于。

Answer 5:

我去了这个回购在这里下车https://github.com/SebastienMichoy/CollectionViewsDemo/tree/master/CollectionViewsDemo/Sources/Collections%20Views

斯威夫特3

子类uicollectionreusableview

class SectionView: UICollectionReusableView {
   static let kind = "sectionView"
}

子类uicollectionViewFlowLayout

class CustomFlowLayout: UICollectionViewFlowLayout {

// MARK: Properties

var decorationAttributes: [IndexPath: UICollectionViewLayoutAttributes]
var sectionsWidthOrHeight: [IndexPath: CGFloat]


// MARK: Initialization

override init() {
    self.decorationAttributes = [:]
    self.sectionsWidthOrHeight = [:]

    super.init()
}

required init?(coder aDecoder: NSCoder) {
    self.decorationAttributes = [:]
    self.sectionsWidthOrHeight = [:]

    super.init(coder: aDecoder)
}

// MARK: Providing Layout Attributes

override func layoutAttributesForDecorationView(ofKind elementKind: String, at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
    return self.decorationAttributes[indexPath]
}

override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
    var attributes = super.layoutAttributesForElements(in: rect)
    let numberOfSections = self.collectionView!.numberOfSections
    var xOrYOffset = 0 as CGFloat

    for sectionNumber in 0 ..< numberOfSections {
        let indexPath = IndexPath(row: 0, section: sectionNumber)
        let numberOfItems = self.collectionView?.numberOfItems(inSection: sectionNumber)
        let sectionWidthOrHeight = numberOfItems == 0 ? UIScreen.main.bounds.height : collectionViewContentSize.height//self.sectionsWidthOrHeight[indexPath]!
        let decorationAttribute = UICollectionViewLayoutAttributes(forDecorationViewOfKind: SectionView.kind, with: indexPath)
        decorationAttribute.zIndex = -1

        if self.scrollDirection == .vertical {
            decorationAttribute.frame = CGRect(x: 0, y: xOrYOffset, width: self.collectionViewContentSize.width, height: sectionWidthOrHeight)
        } else {
            decorationAttribute.frame = CGRect(x: xOrYOffset, y: 0, width: sectionWidthOrHeight, height: self.collectionViewContentSize.height)
        }

        xOrYOffset += sectionWidthOrHeight

        attributes?.append(decorationAttribute)
        self.decorationAttributes[indexPath] = decorationAttribute
    }

    return attributes
}
}

实现这个

的CollectionView委托功能

func collectionView(_ collectionView: UICollectionView, willDisplaySupplementaryView view: UICollectionReusableView, forElementKind elementKind: String, at indexPath: IndexPath) {

    Log.printLog(identifier: elementKind, message: indexPath)
    if elementKind == UICollectionElementKindSectionHeader, let view = view as? ProfileViewHeaderView {

        view.backgroundColor = UIColor(red: (102 / 255.0), green: (169 / 255.0), blue: (251 / 255.0), alpha: 1)
    } else if elementKind == SectionView.kind {
        let evenSectionColor = UIColor.black
        let oddSectionColor = UIColor.red

        view.backgroundColor = (indexPath.section % 2 == 0) ? evenSectionColor : oddSectionColor
    }
}

这个很重要

let layout = CustomFlowLayout()
layout.register(SectionView.self, forDecorationViewOfKind: SectionView.kind)

注册布局没有的CollectionView的UICollectionReusableView。

还有一件事。我搞砸周围的layoutAttributesForElements高度。你应该改变它自己的项目。

Answer 6:

我已经改变了每个部分的背景颜色，在下面的方法非常简单的方式：但我不知道它是否是做正确的事。但它确实工作。

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    FamilyCalendarCellItemCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"calendarItem" forIndexPath:indexPath];
    Event *event;
    _headerView = [collectionView dequeueReusableSupplementaryViewOfKind:
                   UICollectionElementKindSectionHeader withReuseIdentifier:@"EventHeader" forIndexPath:indexPath]; //headerView is declared as property of Collection Reusable View class
    if(indexPath.section==0) {

        cell.backgroundColor=[UIColor orangeColor];
        }
    else if(indexPath.section==1) {

        cell.backgroundColor=[UIColor yellowColor];

    }

    return cell;
}

文章来源: How to change background color of a whole section in UICollectionView?