`tableView:heightForHeaderInSection:` called on delegate that doesn't implement it
cocoa-touch, ios, objective-c, uikit, uitableview
Solution
Any chance you're using the Apptimize framework for A/B testing? Introducing it into my project causes it to cause the UITableView delegate responding checks to stop working, and makes the UITableView issue you're describing happen. If I remove the framework, it stops happening.
Problem
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[SomeClassNameController tableView:heightForHeaderInSection:]: unrecognized selector sent to instance 0x1805f1f0' Unless I've misunderstood the documentation, this shouldn't be possible. If `tableView:heightForHeaderInSection:` isn't implemented in the delegate it should use whatever value that is stored in `sectionHeaderHeight`. Under no circumstances should it call `tableView:heightForHeaderInSection:` on a delegate that doesn't implement it. Is this correct or did I in fact misunderstand the documentation? EDIT: Stack trace as requested. ``` Last Exception Backtrace: 0 CoreFoundation 0x30443e83 __exceptionPreprocess + 131 1 libobjc.A.dylib 0x3aadf6c7 _objc_exception_throw + 39 2 CoreFoundation 0x304477b7 -[NSObject(NSObject) doesNotRecognizeSelector:] + 203 3 CoreFoundation 0x30445f4d ___forwarding___ + 353 4 CoreFoundation 0x30394dc8 __CF_forwarding_prep_0 + 24 5 UIKit 0x32cabfff -[UISectionRowData heightForHeaderInSection:canGuess:] + 123 6 UIKit 0x32cabf2b -[UITableViewRowData rectForHeaderInSection:heightCanBeGuessed:] + 391 7 UIKit 0x32dc83b3 -[_UITableViewUpdateSupport(Private) _setupAnimationsForExistingHeadersAndFooters] + 1603 8 UIKit 0x32dc37db -[_UITableViewUpdateSupport _setupAnimations] + 187 9 UIKit 0x32dc328b -[UITableView _updateWithItems:updateSupport:] + 1363 10 UIKit 0x32d9b397 -[UITableView _endCellAnimationsWithContext:] + 8019 11 appname 0x000704a9 -[SomeClassNameView layoutSubviews] (SomeClassNameView.m:47) 12 UIKit 0x32bc8353 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 347 13 QuartzCore 0x3284e943 -[CALayer layoutSublayers] + 143 14 QuartzCore 0x3284a167 CA::Layer::layout_if_needed(CA::Transaction*) + 351 15 QuartzCore 0x32849ff9 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 17 16 QuartzCore 0x32849a0d CA::Context::commit_transaction(CA::Transaction*) + 229 17 QuartzCore 0x3284981f CA::Transaction::commit() + 315 18 QuartzCore 0x3284354d CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 57 19 CoreFoundation 0x3040ef69 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 21 20 CoreFoundation 0x3040c8f7 __CFRunLoopDoObservers + 287 21 CoreFoundation 0x3040cc43 __CFRunLoopRun + 739 22 CoreFoundation 0x30377471 _CFRunLoopRunSpecific + 525 23 CoreFoundation 0x30377253 _CFRunLoopRunInMode + 107 24 GraphicsServices 0x350782eb _GSEventRunModal + 139 25 UIKit 0x32c2c845 _UIApplicationMain + 1137 26 appname 0x00386767 main (main.m:32) 27 appname 0x00020e48 start + 40 ```