如何修复NSCollectionViewItem重叠问题?

Question

我使用NSCollectionView来显示一个水平列表。但是所有的单元格在第一个单元格位置重叠，像这样。

我没有足够的声誉来发布图片。[cell1,cell2,cell3]，它们都在第一个细胞位置重叠。所以它看起来只是一个单元格，但实际上它有3个单元格。

我的主代码:

ViewController.h
- (void)viewDidLoad {
[super viewDidLoad];

self.flowLayout.scrollDirection = NSCollectionViewScrollDirectionHorizontal;
self.collectionView.dataSource = self;
self.collectionView.delegate = self;
self.collectionView.selectable = YES;
self.collectionView.allowsMultipleSelection = YES;
[self.collectionView registerNib:[[NSNib alloc] initWithNibNamed:@"ScreenShotCellView" bundle:nil] forItemWithIdentifier:NSStringFromClass([ScreenShotCellView class])];
}
#pragma mark - NSCollectionViewDataSource
- (NSInteger)numberOfSectionsInCollectionView:(NSCollectionView *)collectionView {
[self.collectionView.collectionViewLayout invalidateLayout];
return 1;
}
- (NSInteger)collectionView:(NSCollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return self.screenshotItems.count;
}
- (NSCollectionViewItem *)collectionView:(NSCollectionView *)collectionView itemForRepresentedObjectAtIndexPath:(NSIndexPath *)indexPath {
NSCollectionViewItem *itemCell = [self.collectionView makeItemWithIdentifier:NSStringFromClass([ScreenShotCellView class]) forIndexPath:indexPath];
if ([itemCell isKindOfClass:[ScreenShotCellView class]]) {
ScreenShotCellView *cellView = (ScreenShotCellView *)itemCell;
ScreenshotItem *itemData = [self.screenshotItems objectAtIndex:indexPath.item];
cellView.item = itemData;
}
return itemCell;
}
#pragma mark - NSCollectionViewDelegateFlowLayout
- (NSSize)collectionView:(NSCollectionView *)collectionView layout:(NSCollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
return CGSizeMake(100, self.collectionView.frame.size.height - 20);
}
- (CGFloat)collectionView:(NSCollectionView *)collectionView layout:(NSCollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
return 10;
}
- (CGFloat)collectionView:(NSCollectionView *)collectionView layout:(NSCollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
return 10;
}

我怎么做才能解决它?

Answer 1

我已经找到原因了。问题在我的自定义单元格。

@interface ScreenShotCellView ()
@property (weak) IBOutlet NSView *containerView;
@end
@implementation ScreenShotCellView
- (void)loadView {
self.view = self.containerView;
}
@end

在loadView方法中。self.view = self.containerView;总是显示在第一个单元格。

这样改变后，就正常了。

- (void)loadView {
self.view = [[NSView alloc] init];
[self.view addSubview:self.containerView];
}