Crash blog post

crash.txt

Incident Identifier: 6FBDC34D-419A-4935-A779-79695E01ACA4
CrashReporter Key:   207bf1d2971018f44f385b92648252feaf7a5f60
Hardware Model:      iPhone6,1
Process:             Wealthfront [165]
Version:             1.0 (1.0)
Code Type:           ARM (Native)
Parent Process:      launchd [1]

Date/Time:           2014-02-24 08:14:56.266 -0800
OS Version:          iOS 7.0.4 (11B554a)
Report Version:      104

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x000000009176107d
Triggered by Thread:  0

Thread 0 Crashed:
0   libobjc.A.dylib               	0x389b3b67 objc_msgSend + 7
1   UIKit                         	0x30ed7335 -[UIScrollView(UIScrollViewInternal) _delegateScrollViewAnimationEnded] + 49
2   UIKit                         	0x30ed72c1 -[UIScrollView(UIScrollViewInternal) _scrollViewAnimationEnded:finished:] + 173
3   UIKit                         	0x30f7fd67 -[UIAnimator stopAnimation:] + 463
4   UIKit                         	0x30f7f749 -[UIAnimator(Static) _advanceAnimationsOfType:withTimestamp:] + 281
5   UIKit                         	0x30f7f629 -[UIAnimator(Static) _LCDHeartbeatCallback:] + 49
6   QuartzCore                    	0x30ab2acf CA::Display::DisplayLinkItem::dispatch() + 95
7   QuartzCore                    	0x30ab2879 CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 341
8   IOMobileFramebuffer           	0x336dc76b IOMobileFramebufferVsyncNotifyFunc + 103
9   IOKit                         	0x2f339be3 IODispatchCalloutFromCFMessage + 247
10  CoreFoundation                	0x2e617b7f __CFMachPortPerform + 135
11  CoreFoundation                	0x2e622775 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 33
12  CoreFoundation                	0x2e62270f __CFRunLoopDoSource1 + 343
13  CoreFoundation                	0x2e620edb __CFRunLoopRun + 1403
14  CoreFoundation                	0x2e58b46d CFRunLoopRunSpecific + 521
15  CoreFoundation                	0x2e58b24f CFRunLoopRunInMode + 103
16  GraphicsServices              	0x332bf2e7 GSEventRunModal + 135
17  UIKit                         	0x30e40841 UIApplicationMain + 1133
18  Wealthfront                   	0x0003719f 0x28000 + 61855
19  libdyld.dylib                 	0x38eb1ab5 start + 1

fix.m

- (void)dealloc {
  _tableView.dataSource = nil;
  _tableView.delegate = nil;
}

responds.m

if ([_delegate respondToSelector:@selector(scrollViewDidEndScrollingAnimation:)]) {
  [_delegate scrollViewDidEndScrollingAnimation:self];
}

test.m

- (void)testView {
  WFTableViewController *vc = [[WFTableViewController alloc] init];
  [vc view];
  
  UITableView *tv = vc.tableView;
  vc = nil;
  STAssertNil(tv.dataSource, @"Should be nil");
  STAssertNil(tv.delegate, @"Should be nil");
}

test2.m

@interface UIScrollView (PrivateTestMethods)
- (void)_scrollViewAnimationEnded:(UIScrollView *)scrollView finished:(BOOL)finished;
@end

- (void)testView {
  WFTableViewController *vc = [[WFTableViewController alloc] init];
  [vc view];
  
  UITableView *tv = vc.tableView;
  vc = nil;
  [tv _scrollViewAnimationEnded:tv finished:YES];
  STAssertNil(tv.dataSource, @"Should be nil");
  STAssertNil(tv.delegate, @"Should be nil");
}

test2Log.txt

(lldb) bt
* thread #1: tid = 0x17e7cf, 0x020150b2 libobjc.A.dylib`objc_msgSend + 14, queue = 'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=1, address=0x8000000c)
    frame #0: 0x020150b2 libobjc.A.dylib`objc_msgSend + 14
    frame #1: 0x008956a5 UIKit`-[UIScrollView(UIScrollViewInternal) _delegateScrollViewAnimationEnded] + 62
    frame #2: 0x008957bc UIKit`-[UIScrollView(UIScrollViewInternal) _scrollViewAnimationEnded:finished:] + 189
    frame #3: 0x09ad6083 WealthfrontTests`-[WFTableViewControllerTest testView](self=0x08ef2db0, _cmd=0x09d106d0) + 17891 at WFTableViewControllerTest.m:125