Strange Crash when dismissing view controller, auto-layout to blame?

Question

I am experiencing a very strange crash, here is the backtrace.

* thread #1: tid = 0x2403, 0x3379516c CoreFoundation`CFHash + 8, stop reason = EXC_BREAKPOINT          


        

Answer 1

Based on idea of Carl Lindberg I prepared and used the following iOS category and I have no crash anymore:

UIView+AddSubviewWithRemovingFromParent.h

#import 

@interface UIView (AddSubviewWithRemovingFromParent)

- (void)addSubviewWithRemovingFromParent:(UIView *)view;

@end

UIView+AddSubviewWithRemovingFromParent.m

#import "UIView+AddSubviewWithRemovingFromParent.h"

@implementation UIView (AddSubviewWithRemovingFromParent)

- (void)addSubviewWithRemovingFromParent:(UIView *)view {
    if (view.superview != nil) {
        [view removeFromSuperview];
    }
    [self addSubview:view];
}

@end

now you can use the addSubviewWithRemovingFromParent method to add the subView instead of addSubview method like this:

UITableViewCell *cell = [[UITableViewCell alloc] init];
[cell.contentView addSubviewWithRemovingFromParent:];

To sum it up:

1. find all references of addSubView in your controllers where the app is crashing
2. import the category UIView+AddSubviewWithRemovingFromParent.h
3. use method addSubviewWithRemovingFromParent instead of addSubView