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在我覆盖UICollectionViewFlowLayout它后显示 3 个警告，如下所示

  • 仅记录一次 UICollectionViewFlowLayout 缓存不匹配的帧

  • UICollectionViewFlowLayout已缓存索引路径 {length = 2, path = 0 - 1} 的帧不匹配 - 缓存值：{{145, 0}, {130, 130}}；期望值：{{5, 141}, {130, 130}}

  • 这可能是因为流布局子类 FullyHorizo​​ntalFlowLayout 正在修改返回的属性UICollectionViewFlowLayout而不复制它们

我使用 ' FullyHorizontalFlowLayout' 使 i 单元格从左到右排列（原来是从上到下）。下面是我的“ layoutAttributesForElementsInRect”代码

-(NSArray*)layoutAttributesForElementsInRect:(CGRect)rect
{
CGFloat newX = MIN(0, rect.origin.x - rect.size.width/2);
CGFloat newWidth = rect.size.width*2 + (rect.origin.x - newX);

CGRect newRect = CGRectMake(newX, rect.origin.y, newWidth, rect.size.height);

// Get all the attributes for the elements in the specified frame
NSArray *allAttributesInRect = [super layoutAttributesForElementsInRect:newRect];

for (UICollectionViewLayoutAttributes *attr in allAttributesInRect) {
    UICollectionViewLayoutAttributes *newAttr = [self layoutAttributesForItemAtIndexPath:attr.indexPath];

    attr.frame = newAttr.frame;

    attr.center = newAttr.center;
    attr.bounds = newAttr.bounds;
    attr.hidden = newAttr.hidden;
    attr.size = newAttr.size;

}
return allAttributesInRect;
}
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1 回答 1

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您应该使用以下片段深入复制支持属性数组：

NSArray *superArray = [super layoutAttributesForElementsInRect:rect];
NSArray *array = [[NSArray alloc] initWithArray:superArray copyItems:YES];
于 2016-05-19T02:25:38.060 回答