Crash

[RK905]

-[UICollectionView(ARDynamicCacheHeightLayoutCell) ar_sizeForCellWithIdentifier:indexPath:fixedValue:caculateType:configuration:] (in Unite) (UICollectionView+ARDynamicCacheHeightLayoutCell.m:95)

-[UICollectionView(ARDynamicCacheHeightLayoutCell) ar_sizeForCellWithIdentifier:indexPath:fixedWidth:configuration:] (in Unite) (UICollectionView+ARDynamicCacheHeightLayoutCell.m:56)

[AugustRush]

can you pasted the calling stack？

[RK905]

0 CoreFoundation 0x181646fe0 0x18151a000 + 1232864
1 libobjc.A.dylib 0x1800a8538 0x1800a0000 + 34104
2 CoreFoundation 0x181525200 0x18151a000 + 45568
3 Unite 0x100a18ca8 0x10009c000 + 9948328
4 Unite 0x100a180ac 0x10009c000 + 9945260
5 Unite 0x100543698 0x10009c000 + 4880024
6 UIKit 0x18809ddb4 0x187768000 + 9657780
7 UIKit 0x18809f1f0 0x187768000 + 9662960
8 UIKit 0x1878e8aa4 0x187768000 + 1575588
9 UIKit 0x1877d4314 0x187768000 + 443156
10 UIKit 0x1877d3920 0x187768000 + 440608
11 UIKit 0x1877d3388 0x187768000 + 439176
12 UIKit 0x18777507c 0x187768000 + 53372
13 QuartzCore 0x184965274 0x18484e000 + 1143412
14 QuartzCore 0x184959de8 0x18484e000 + 1097192
15 QuartzCore 0x184959ca8 0x18484e000 + 1096872
16 QuartzCore 0x1848d534c 0x18484e000 + 553804
17 QuartzCore 0x1848fc3ac 0x18484e000 + 713644
18 QuartzCore 0x1848fce78 0x18484e000 + 716408
19 CoreFoundation 0x1815f49a8 0x18151a000 + 895400
20 CoreFoundation 0x1815f2630 0x18151a000 + 886320
21 CoreFoundation 0x1815f2a7c 0x18151a000 + 887420
22 CoreFoundation 0x181522da4 0x18151a000 + 36260
23 GraphicsServices 0x182f8c074 0x182f80000 + 49268
24 UIKit 0x1877dd058 0x187768000 + 479320
25 Unite 0x1000a8a44 0x10009c000 + 51780
26 libdyld.dylib 0x18053159c 0x18052d000 + 17820

0 CoreFoundation 0x181646fe0 0x18151a000 + 1232864
1 libobjc.A.dylib 0x1800a8538 0x1800a0000 + 34104
2 CoreFoundation 0x181525200 0x18151a000 + 45568
3 Unite -[UICollectionView(ARDynamicCacheHeightLayoutCell) ar_sizeForCellWithIdentifier:indexPath:fixedValue:caculateType:configuration:] (in Unite) (UICollectionView+ARDynamicCacheHeightLayoutCell.m:95)
4 Unite -[UICollectionView(ARDynamicCacheHeightLayoutCell) ar_sizeForCellWithIdentifier:indexPath:fixedWidth:configuration:] (in Unite) (UICollectionView+ARDynamicCacheHeightLayoutCell.m:56)
5 Unite -[feedCollection collectionView:layout:sizeForItemAtIndexPath:] (in Unite) (feedCollection.m:139)
6 UIKit 0x18809ddb4 0x187768000 + 9657780
7 UIKit 0x18809f1f0 0x187768000 + 9662960
8 UIKit 0x1878e8aa4 0x187768000 + 1575588
9 UIKit 0x1877d4314 0x187768000 + 443156
10 UIKit 0x1877d3920 0x187768000 + 440608
11 UIKit 0x1877d3388 0x187768000 + 439176
12 UIKit 0x18777507c 0x187768000 + 53372
13 QuartzCore 0x184965274 0x18484e000 + 1143412
14 QuartzCore 0x184959de8 0x18484e000 + 1097192
15 QuartzCore 0x184959ca8 0x18484e000 + 1096872
16 QuartzCore 0x1848d534c 0x18484e000 + 553804
17 QuartzCore 0x1848fc3ac 0x18484e000 + 713644
18 QuartzCore 0x1848fce78 0x18484e000 + 716408
19 CoreFoundation 0x1815f49a8 0x18151a000 + 895400
20 CoreFoundation 0x1815f2630 0x18151a000 + 886320
21 CoreFoundation 0x1815f2a7c 0x18151a000 + 887420
22 CoreFoundation 0x181522da4 0x18151a000 + 36260
23 GraphicsServices 0x182f8c074 0x182f80000 + 49268
24 UIKit 0x1877dd058 0x187768000 + 479320
25 Unite main (in Unite) (main.m:17)
26 libdyld.dylib 0x18053159c 0x18052d000 + 17820

[AugustRush]

There is noting useful information ...

[NBXXF]

这个是你没有执行完约束 建议在调用前执行【cell layoutIfNeeded】方法