报错提示：

*** Assertion failure in -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:], /SourceCache/UIKit_Sim/UIKit-3318.16.14/UICollectionView.m:3307

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'invalid nib registered for identifier (SXDealCellID) - nib must contain exactly one top level object which must be a UICollectionReusableView instance'

解决方案：

　　在自定义xib时，额外多了一个控件在另外的区域，把此控件删掉即可。