UICollectionview self sizing cells is not working - ios

Question

I want to use self sizing cells in my collection view.
My cells don't use auto layout -
I've implemented the methods as required but still they are not resizing properly.
Attached is the code:
#interface Cell : UICollectionViewCell
#end
#implementation Cell
-(CGSize)sizeThatFits:(CGSize)size {
return CGSizeMake(320, 200);
}
// I have tried with and without this
-(UICollectionViewLayoutAttributes *)preferredLayoutAttributesFittingAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes {
UICollectionViewLayoutAttributes *attributes = [super preferredLayoutAttributesFittingAttributes:layoutAttributes];
CGRect frame = attributes.frame;
frame.size = CGSizeMake(320, 200);
return attributes;
}
#end
#interface ViewController () <UICollectionViewDataSource>
#property (nonatomic,strong) UICollectionView *collectionView;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
[self.view addSubview:self.collectionView];
self.collectionView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.collectionView registerClass:[Cell class] forCellWithReuseIdentifier:#"cell"];
self.collectionView.dataSource = self;
layout.estimatedItemSize = CGSizeMake(320, 10);
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark -
#pragma mark UICollectionViewDataSource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return 10;
}
// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"cell" forIndexPath:indexPath];
cell.contentView.backgroundColor = [UIColor redColor];
return cell;
}
Also when rotating the device I get a crash:
*** Assertion failure in -[_UIFlowLayoutSection computeLayoutInRect:forSection:invalidating:], /SourceCache/UIKit_Sim/UIKit-3318.16.14/UIFlowLayoutSupport.m:763
2015-03-08 11:09:06.430 TestSelfSizingCells[77344:3177236] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UICollectionViewFlowLayout internal error'
*** First throw call stack:
(
0 CoreFoundation 0x000000010881bf35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001084b4bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010881bd9a +[NSException raise:format:arguments:] + 106
3 Foundation 0x00000001080d15df -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
4 UIKit 0x0000000109298e53 -[_UIFlowLayoutSection computeLayoutInRect:forSection:invalidating:] + 9052
5 UIKit 0x000000010925f96c __56-[UICollectionViewFlowLayout _updateItemsLayoutForRect:]_block_invoke + 509
6 CoreFoundation 0x0000000108754042 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 114
7 CoreFoundation 0x000000010875379c -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 300
8 UIKit 0x000000010925f69c -[UICollectionViewFlowLayout _updateItemsLayoutForRect:] + 780
9 UIKit 0x000000010925fce2 -[UICollectionViewFlowLayout _fetchItemsInfoForRect:] + 583
10 UIKit 0x000000010925cde6 -[UICollectionViewFlowLayout _layoutAttributesForItemsInRect:] + 646
11 UIKit 0x000000010925e268 -[UICollectionViewFlowLayout layoutAttributesForElementsInRect:] + 119
12 UIKit 0x0000000109274130 __45-[UICollectionViewData validateLayoutInRect:]_block_invoke + 144
13 UIKit 0x0000000109273627 -[UICollectionViewData validateLayoutInRect:] + 1396
14 UIKit 0x000000010923b7b8 -[UICollectionView layoutSubviews] + 170
15 UIKit 0x0000000108c81973 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521
16 QuartzCore 0x000000010c4f6de8 -[CALayer layoutSublayers] + 150
17 QuartzCore 0x000000010c4eba0e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
18 QuartzCore 0x000000010c4f6d1d -[CALayer layoutIfNeeded] + 162
19 UIKit 0x0000000108d4374a -[UIViewController window:willAnimateRotationToInterfaceOrientation:duration:newSize:] + 211
20 UIKit 0x0000000108d47e84 __95-[UIViewController(AdaptiveSizing) _window:viewWillTransitionToSize:withTransitionCoordinator:]_block_invoke2889 + 73
21 UIKit 0x0000000109361a0e -[_UIViewControllerTransitionCoordinator _applyBlocks:releaseBlocks:] + 217
22 UIKit 0x000000010935ef2e -[_UIViewControllerTransitionContext __runAlongsideAnimations] + 139
23 UIKit 0x00000001090964d4 __58-[_UIWindowRotationAnimationController animateTransition:]_block_invoke + 96
24 UIKit 0x0000000108c7a362 +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 473
25 UIKit 0x0000000108c7a5b7 +[UIView(UIViewAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 57
26 UIKit 0x0000000109096430 -[_UIWindowRotationAnimationController animateTransition:] + 408
27 UIKit 0x0000000108c52704 -[UIWindow _rotateToBounds:withAnimator:transitionContext:] + 761
28 UIKit 0x0000000108c54ac0 -[UIWindow _rotateWindowToOrientation:updateStatusBar:duration:skipCallbacks:] + 2134
29 UIKit 0x0000000108c55092 -[UIWindow _setRotatableClient:toOrientation:applyTransformToWindow:updateStatusBar:duration:force:isRotating:] + 559
30 UIKit 0x0000000108c541ee -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 116
31 UIKit 0x0000000108c54174 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 36
32 UIKit 0x0000000108c54021 -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 122
33 UIKit 0x0000000108c53100 __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 98
34 UIKit 0x0000000108c53079 -[UIWindow _updateToInterfaceOrientation:duration:force:] + 386
35 UIKit 0x0000000108c53450 -[UIWindow _updateInterfaceOrientationFromDeviceOrientation:] + 316
36 CoreFoundation 0x00000001087ebcec __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
37 CoreFoundation 0x00000001086eb8a4 _CFXNotificationPost + 2484
38 Foundation 0x00000001080126b8 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
39 UIKit 0x0000000108e70efc -[UIDevice setOrientation:animated:] + 282
40 UIKit 0x0000000108c1c476 -[UIApplication handleEvent:withNewEvent:] + 1474
41 UIKit 0x0000000108c1c90a -[UIApplication sendEvent:] + 79
42 UIKit 0x0000000108c086af _UIApplicationHandleEvent + 593
43 GraphicsServices 0x000000010bdec33e _PurpleEventCallback + 756
44 GraphicsServices 0x000000010bdebe26 PurpleEventCallback + 35
45 CoreFoundation 0x00000001087517c9 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
46 CoreFoundation 0x000000010875173b __CFRunLoopDoSource1 + 475
47 CoreFoundation 0x0000000108746f88 __CFRunLoopRun + 2200
48 CoreFoundation 0x0000000108746486 CFRunLoopRunSpecific + 470
49 GraphicsServices 0x000000010bdea9f0 GSEventRunModal + 161
50 UIKit 0x0000000108c08420 UIApplicationMain + 1282
51 TestSelfSizingCells 0x0000000107f87853 main + 115
52 libdyld.dylib 0x000000010adab145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
I've also noticed that when using different screen sizes the results very. For instance in iPhone 5 the cells look "ok" in the beginning. But after a while they get screwed up.
Also in iPhone 6 simulator, the collection view doesn't scroll at all , until I rotate the device back and forth, and then eventually the app crashes.