collectionViewLayout sizeForItemAtIndexPath -> CGSize奇异行为
collectionViewLayout sizeForItemAtIndexPath -> CGSize奇异行为
提问于 2016-11-17 11:31:15
因此，有趣的是，我尝试使用collectionViewLayout sizeForItemAtIndexPath在collectionView中一次只显示一个项目，并水平滚动，我尝试了如下：
- (void)viewDidLoad {
[super viewDidLoad];
flowLayout = [[UICollectionViewFlowLayout alloc]init];
flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
flowLayout.minimumInteritemSpacing = 0.0;
flowLayout.minimumLineSpacing = 0.0;
_obj_CollectionView.pagingEnabled = YES;
_obj_CollectionView.collectionViewLayout = flowLayout;
self.obj_CollectionView.delegate = self;
self.obj_CollectionView.dataSource = self;
_obj_CollectionView.backgroundColor = [UIColor redColor];
}
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
return CGSizeMake(collectionView.frame.size.width, collectionView.frame.size.height);
}以下是collectionView截图：
这里，紫色是我的细胞，红色是我的collectionView，但是我想要整个紫色。
所以请引导我。我很困惑。:)
回答 6
Stack Overflow用户
回答已采纳
发布于 2016-11-21 12:03:09
试试这个：
func collectionView(collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
return 1.0
}
func collectionView(collectionView: UICollectionView, layout
collectionViewLayout: UICollectionViewLayout,
minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
return 1.0
}ViewDidload：
layout.minimumInteritemSpacing = 20
layout.minimumLineSpacing = 10CellforrowAtIndexPath：
cell.image.clipsToBounds = true
cell.contentView.frame = cell.boundsStack Overflow用户
发布于 2016-11-17 17:38:07
首先，您不需要以编程方式创建UICollectionViewFlowLayout对象。也不需要用viewDidLoad()编写的代码。所有这些都可以使用storyboard和delegate方法来完成。
下面是解决问题的代码：
import UIKit
class ViewController: UIViewController
{
@IBOutlet weak var collectionView: UICollectionView!
override func viewDidLoad()
{
super.viewDidLoad()
}
}
extension ViewController : UICollectionViewDataSource
{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
return 10
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
cell.backgroundColor = (indexPath.item % 2 == 0) ? UIColor.purple : UIColor.blue
return cell
}
}
extension ViewController : UICollectionViewDelegateFlowLayout
{
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
{
return CGSize(width: collectionView.bounds.width, height: collectionView.bounds.height)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat
{
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets
{
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
}故事板截图：
输出屏幕：
Stack Overflow用户
发布于 2016-11-17 13:15:37
我做了一个小的概念证明，它的工作，正如我所期望的。也许您的CollectionViewCell (错误/缺少约束)有问题？
import UIKit
class CollectionViewController: UICollectionViewController {
let layout = UICollectionViewFlowLayout()
override func viewDidLoad() {
super.viewDidLoad()
layout.scrollDirection = .horizontal
layout.minimumInteritemSpacing = 0
layout.minimumLineSpacing = 0
collectionView?.collectionViewLayout = layout
collectionView?.isPagingEnabled = true
}
override func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
cell.backgroundColor = (indexPath.item % 2 == 0) ? UIColor.purple : UIColor.blue
return cell
}
}
extension CollectionViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return self.view.frame.size
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40653789
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