*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString appendString:]: nil argument'
*** First throw call stack:
(
0 CoreFoundation 0x0000000110815b0b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010fe66141 objc_exception_throw + 48
2 CoreFoundation 0x000000011087e625 +[NSException raise:format:] + 197
3 CoreFoundation 0x000000011084b594 mutateError + 196
4 swft 0x000000010ed371ba -[QuickTableViewController tableView:cellForRowAtIndexPath:] + 2794
5 UIKit 0x000000011107fd98 -[_UIFilteredDataSource tableView:cellForRowAtIndexPath:] + 98
6 UIKit 0x0000000110da5ab2 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 750
7 UIKit 0x0000000110da5cf8 -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 74
8 UIKit 0x0000000110d7a639 -[UITableView _updateVisibleCellsNow:isRecursive:] + 2845
9 UIKit 0x0000000110daeccc -[UITableView _performWithCachedTraitCollection:] + 111
10 UIKit 0x0000000110d95e7a -[UITableView layoutSubviews] + 233
11 UIKit 0x0000000110cfc55b -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1268
12 QuartzCore 0x0000000115953904 -[CALayer layoutSublayers] + 146
13 QuartzCore 0x0000000115947526 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 370
14 QuartzCore 0x00000001159473a0 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
15 QuartzCore 0x00000001158d6e92 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
16 QuartzCore 0x0000000115903130 _ZN2CA11Transaction6commitEv + 468
17 UIKit 0x0000000110c645e7 _afterCACommitHandler + 272
18 CoreFoundation 0x00000001107bb717 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
19 CoreFoundation 0x00000001107bb687 __CFRunLoopDoObservers + 391
20 CoreFoundation 0x00000001107a0720 __CFRunLoopRun + 1200
21 CoreFoundation 0x00000001107a0016 CFRunLoopRunSpecific + 406
22 GraphicsServices 0x000000011517da24 GSEventRunModal + 62
23 UIKit 0x0000000110c39134 UIApplicationMain + 159
24 swft 0x000000010ed4358f main + 111
25 libdyld.dylib 0x00000001130fc65d start + 1
26 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
报这个错误的原因是因为拼接的字符串中，有空字符串
