当 [searchDisplayController.searchResultsTableView setSeparatorStyle:UITableViewCellSeparatorStyleNone] 时， 发送了崩溃
错误提示如下：
Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 1 beyond bounds [0 .. 0]'*** First throw call stack:(0 CoreFoundation 0x000000010c6c6c65 __exceptionPreprocess + 1651 libobjc.A.dylib 0x000000010c35fbb7 objc_exception_throw + 452 CoreFoundation 0x000000010c5bd17e -[__NSArrayI objectAtIndex:] + 1903 UIKit 0x000000010d230fd2 -[UITableViewDataSource tableView:indentationLevelForRowAtIndexPath:] + 1064 UIKit 0x000000010cdfb1b9 __53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 1711
查了好久才查到原因： 在错误log中有提示
3 UIKit 0x000000010d230fd2 -[UITableViewDataSource tableView:indentationLevelForRowAtIndexPath:] + 106
解决方法：
-(NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath{ return 0;}