i255979

如何实现拖动时展示对齐参考线的效果

2

想实现类似sketch拖动时，居中或与其他元素边缘重叠时展示的垂直和横向参考线效果，求思路

i add a header for PSCollectionView, and cause a bug, the index 2 (sometimes other) cell have no selected event dispatch. i debug it, and found that it cause by...