Switching delegates on UITableView leads to crash
| Originator: | sriggins | ||
| Number: | rdar://16266367 | Date Originated: | 07-Mar-2014 03:28 PM |
| Status: | Open | Resolved: | |
| Product: | iOS SDK | Product Version: | 7.0.4 |
| Classification: | Crash/Hang/Data Loss | Reproducible: | Always |
Summary: If you set up a UITableView with a delegate the implements tableView:estimatedHeightForRowAtIndexPath:, and then switch to one that does not, UITableView can crash in reloadData See GitHub for example: https://github.com/steveriggins/EstimatedHeight Steps to Reproduce: 1) Implement a UIViewController with a tableView 2) Implement two NSObjects conforming to UITableVIewDataSource and UITableViewDeleegate 3) First one implements tableView:estimatedHeightForRowAtIndexPath: for section index 1 (out of 3) 4) Second one does not implement tableView:estimatedHeightForRowAtIndexPath:, only has two sections 5) Set the tableView delegate/datasource to the first delegate 6) reloadTable 7) Tap button that sets dataSource/delegate to delegate two 8) reloadTable 9 ) crash Expected Results: no crash Actual Results: Thread 1, Queue : com.apple.main-thread #0 0x00480d60 in __66-[UISectionRowData refreshWithSection:tableView:tableViewRowData:]_block_invoke () #1 0x00480450 in -[UISectionRowData refreshWithSection:tableView:tableViewRowData:] () #2 0x004836bd in -[UITableViewRowData numberOfRows] () #3 0x0030bdb2 in -[UITableView noteNumberOfRowsChanged] () #4 0x0030b75f in -[UITableView reloadData] () #5 0x0f675e91 in -[UITableViewAccessibility(Accessibility) reloadData] () #6 0x00002e82 in -[SRViewController reloadTable:] at /Users/vampira/Desktop/EstimatedHeight/EstimatedHeight/SRViewController.m:69 #7 0x014d1874 in -[NSObject performSelector:withObject:withObject:] () #8 0x0022f0c2 in -[UIApplication sendAction:to:from:forEvent:] () #9 0x00503c9b in -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] () #10 0x014d1874 in -[NSObject performSelector:withObject:withObject:] () #11 0x0022f0c2 in -[UIApplication sendAction:to:from:forEvent:] () #12 0x0022f04e in -[UIApplication sendAction:toTarget:fromSender:forEvent:] () #13 0x003270c1 in -[UIControl sendAction:to:forEvent:] () #14 0x00327484 in -[UIControl _sendActionsForEvents:withEvent:] () #15 0x00326733 in -[UIControl touchesEnded:withEvent:] () #16 0x0026c51d in -[UIWindow _sendTouchesForEvent:] () #17 0x0026d184 in -[UIWindow sendEvent:] () #18 0x00240e86 in -[UIApplication sendEvent:] () #19 0x0022b18f in _UIApplicationHandleEventQueue () #20 0x016c583f in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ () #21 0x016c51cb in __CFRunLoopDoSources0 () #22 0x016e229e in __CFRunLoopRun () #23 0x016e1ac3 in CFRunLoopRunSpecific () #24 0x016e18db in CFRunLoopRunInMode () #25 0x036e19e2 in GSEventRunModal () #26 0x036e1809 in GSEventRun () #27 0x0022dd3b in UIApplicationMain () #28 0x0000290d in main at /Users/vampira/Desktop/EstimatedHeight/EstimatedHeight/main.m:16
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