“Auto Layout still required after executing -layou

Question

Using XCode 4.5 and iOS 6, I'm developing an app with a simple table view with custom cells. I've done this a hundred times in iOS 5 and below, but for some reason the new autoLayout system is giving me a lot of trouble.

I setup my table view and prototype cell in IB, added subviews and wired them up as IBOutlets then setup my delegate and dataSource. However now whenever the first cell is fetched from cellForRowAtIndexPath, I get the following error:

*** Assertion failure in -[ShopCell layoutSublayersOfLayer:], /SourceCache/UIKit_Sim/UIKit-2372/UIView.m:5776

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Auto Layout still required after executing -layoutSubviews. ShopCell's implementation of -layoutSubviews needs to call super.'

I haven't implemented a -layoutSubviews method in my subclassed cell (ShopCell), and even when I try to do that and add the super call as it suggests I still get the same error. If I remove the subviews from the cell in IB, and change it to a standard UITableViewCell, everything works as expected, though of course I'm left with no data in my cells.

I'm almost certain that there's something simple I'm missing, but can't find any documentation or guides to suggest what I've done wrong. Any help would be appreciated.

Edit: Just tried changing it to a UITableViewCell in IB and leaving all the subviews in place, still the same error.

Answer 1

As someone above has already stated, when you create a view for use in a UITableView, you have to delete the view created by default and drag a UITableViewCell or UITableViewHeaderFooterView as the root view. However, there is a way to fix the XIB in case you had missed that part. You have to open the XIB file in a text editor and in the root tag and its direct child add/change the attribute translatesAutoresizingMaskIntoConstraints to YES, for example

<view contentMode="scaleToFill" horizontalHuggingPriority="1000" id="1" translatesAutoresizingMaskIntoConstraints="YES" customClass="MXWCollapsibleTableHeaderView">

Answer 2

I had a similar issue with static table view cells in IB. One of the cells had a subview that had a class that was mistakenly altered to a subclass of UITextfield. The compiler didn't give any warnings/errors. But at runtime the system was unable to load the view controller with the aforementioned crash as a result.

Answer 3

I modified Carl Lindberg's answer to override UITableView instead and it started working for me:

UITableView+AutoLayoutFix.h

@interface UITableView (AutoLayoutFix)
@end

UITableView+AutoLayoutFix.m

#import <objc/runtime.h>

@implementation UITableView (AutoLayoutFix)

+ (void)load
{
    Method existingMethod = class_getInstanceMethod(self, @selector(layoutSubviews));
    Method newMethod = class_getInstanceMethod(self, @selector(_autolayout_replacementLayoutSubviews));

    method_exchangeImplementations(existingMethod, newMethod);
}

- (void)_autolayout_replacementLayoutSubviews
{
    [super layoutSubviews];
    [self _autolayout_replacementLayoutSubviews]; // not recursive due to method swizzling
    [super layoutSubviews];
}

@end

Then in MyViewController.m I just imported the category:

#import "UITableView+AutoLayoutFix.h"

Answer 4

Add your subviews to the contentView of the cell instead of the cell itself. So instead of:

[self addSubview:someView];

you must use

[self.contentView addSubview:someView];

Answer 5

Had the same problem in iOS 7 (iOS 8 seems to fix). The solution for me was to call [self.view layoutIfNeeded] at the end of my viewDidLayoutSubviews method.

Answer 6

I had the same issue. The problem was in the way I was creating the cell Xib. I created a Xib like normal and just changed the type of the default "UIView" to my custom UITableViewCell class. The correct way to is to first delete the default view and then drag the table view cell object onto the xib. More details here : http://allplayers.github.io/blog/2012/11/18/Custom-UITableViewCell-With-NIB/