Ios 没有-LayoutAttributesForDecorrationViewOfKind的UICollectionViewLayoutAttributes实例
我正在使用一个自定义布局,使用UICollectionReusableView的子类获得几个背景色部分。代码如下:Ios 没有-LayoutAttributesForDecorrationViewOfKind的UICollectionViewLayoutAttributes实例,ios,objective-c,uicollectionview,uicollectionreusableview,Ios,Objective C,Uicollectionview,Uicollectionreusableview,我正在使用一个自定义布局,使用UICollectionReusableView的子类获得几个背景色部分。代码如下: - (void)prepareLayout { [super prepareLayout]; self.itemAttributes = [NSMutableArray new]; NSInteger numberOfSection = self.collectionView.numberOfSections; for (int section
- (void)prepareLayout
{
[super prepareLayout];
self.itemAttributes = [NSMutableArray new];
NSInteger numberOfSection = self.collectionView.numberOfSections;
for (int section = 0; section < numberOfSection; section++) {
if (section == self.decorationViewOfKinds.count)
break;
NSString *decorationViewOfKind = self.decorationViewOfKinds[section % self.decorationViewOfKinds.count];
if ([decorationViewOfKind isKindOfClass:[NSNull class]])
continue;
NSInteger lastIndex = [self.collectionView numberOfItemsInSection:section] - 1;
if (lastIndex < 0)
continue;
UICollectionViewLayoutAttributes *firstItem = [self layoutAttributesForItemAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:section]];
UICollectionViewLayoutAttributes *lastItem = [self layoutAttributesForItemAtIndexPath:[NSIndexPath indexPathForRow:lastIndex inSection:section]];
CGRect frame = CGRectUnion(firstItem.frame, lastItem.frame);
frame.origin.x -= self.sectionInset.top;
frame.size.height += self.sectionInset.bottom;
if (self.scrollDirection == UICollectionViewScrollDirectionHorizontal) {
frame.size.width += self.sectionInset.left + self.sectionInset.right;
frame.size.height = self.collectionView.frame.size.height;
}
else {
frame.size.width = self.collectionView.frame.size.width;
frame.size.height += self.sectionInset.top + self.sectionInset.bottom;
}
UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributes layoutAttributesForDecorationViewOfKind:decorationViewOfKind withIndexPath:[NSIndexPath indexPathForRow:0 inSection:section]];
attributes.zIndex = -1;
attributes.frame = frame;
[self.itemAttributes addObject:attributes];
[self registerNib:[UINib nibWithNibName:decorationViewOfKind bundle:[NSBundle mainBundle]] forDecorationViewOfKind:decorationViewOfKind];
}
}
- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{
NSMutableArray *attributes = [NSMutableArray arrayWithArray:[super layoutAttributesForElementsInRect:rect]];
for (UICollectionViewLayoutAttributes *attribute in self.itemAttributes) {
if (!CGRectIntersectsRect(rect, attribute.frame))
continue;
[attributes addObject:attribute];
}
return attributes;
}
-(无效)准备就绪
{
[超级准备];
self.itemtattributes=[NSMutableArray new];
NSInteger numberOfSection=self.collectionView.numberOfSections;
对于(int section=0;section
此代码有时在使用iOS 8.4.1的设备上崩溃:
致命异常:NSInternalInconsistencyException
路径{length=2,path=2-0}处没有-layouttributesfordecorationviewofkindofkindofkind:AlbumsSectionBackgroundDecorView的UICollectionViewLayoutAttribute实例
它不会发生在模拟器中,只会发生在使用iOS 8.4.1的设备中
有什么想法吗?
谢谢
编辑
该错误似乎是由于UICollectionView中的背压而发生的。我已经避免重新加载UICollectionView,并且似乎工作正常