Exception集合

1. 刷新collectionviewcrash

reason: 'UICollectionView received layout attributes for a cell with an index path that does not exist: <NSIndexPath: 0xc000000000200016> {length = 2, path = 0 - 1}'

解决：
在reloadData之后将当前的布局设置失效invalidateLayout，则collectionView会重新刷新布局，否则就会沿用旧的布局导致获取不到数据，导致崩溃。

collectionView.reloadData()
collectionView.collectionViewLayout.invalidateLayout()

2. 10.*系统下collectionview crash

*** Assertion failure in -[_UIFlowLayoutSection computeLayoutInRect:forSection:invalidating:invalidationContext:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3600.7.47/UIFlowLayoutSupport.m:823
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UICollectionViewFlowLayout internal error'
*** First throw call stack:
(
0 CoreFoundation 0x0000000106c11b0b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x0000000106676141 objc_exception_throw + 48
2 CoreFoundation 0x0000000106c15cf2 +[NSException raise:format:arguments:] + 98
3 Foundation 0x0000000103535536 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 193
4 UIKit 0x000000010508ef1b -[_UIFlowLayoutSection computeLayoutInRect:forSection:invalidating:invalidationContext:] + 13308
5 UIKit 0x0000000105024f11 __76-[UICollectionViewFlowLayout _updateItemsLayoutForRect:allowsPartialUpdate:]_block_invoke + 533
6 CoreFoundation 0x0000000106ba2652 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 114

解决：
在布局生效前调用invalidateLayout

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    collectionView.collectionViewLayout.invalidateLayout()
}