自动布局误差

使用masonry自动布局设置collectionView的top,left,size mas_equelto superView
collectionView的宽与superView宽有误差(单次控件实验相差0.06)
frame布局则完全相同

stateViewSize ： superView size 
2021-01-22 21:06:40.077790+0800[37930:702218] [UI] stateViewSize {251.39318750000001, 25}
2021-01-22 21:06:40.133182+0800[37930:702218] [UI] collectionView.contentSize {0, 0}
2021-01-22 21:06:40.133343+0800[37930:702218] [UI] collectionView.frame {{0, 0}, {0, 0}}
2021-01-22 21:06:40.175964+0800[37930:702218] [UI] collectionView.contentSize {251.33333333333334, 60}
2021-01-22 21:06:40.176181+0800[37930:702218] [UI] collectionView.frame {{0, 0}, {251.33333333333334, 25}}
2021-01-22 21:06:40.185984+0800[37930:702218] [UI] collectionView.contentSize {251.33333333333334, 60}
2021-01-22 21:06:40.186314+0800[37930:702218] [UI] collectionView.frame {{0, 0}, {251.33333333333334, 25}}
2021-01-22 21:06:40.218468+0800[37930:702218] [UI] collectionView.contentSize {251.33333333333334, 60}
2021-01-22 21:06:40.218694+0800[37930:702218] [UI] collectionView.frame {{0, 0}, {251.33333333333334, 25}}