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这里有问题,要判断itemCount == 0;  #2

@SumiaFish

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@SumiaFish

/// 返回指定范围内的所有元素的布局属性

  • (nullable NSArray<__kindof UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect
    {
    if (_itemCount <= 0) {
    return nil;
    }
    ....
    }

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