Create UICollectionViewCell subclass with xib [dup

问题:

This question already has answers here:

Xcode - How to fix 'NSUnknownKeyException', reason: … this class is not key value coding-compliant for the key X" error? (69 answers)

Closed 4 years ago.

I'm trying to create a UICollectionViewCell subclass with linked a xib, I have do this: I have create a new xib file and I have add a UICollectionViewCell in it, then I have create this subclass file:

@interface MyCell : UICollectionViewCell

@property (weak, nonatomic) IBOutlet UILabel *label;
@end

Also I have linked in the file owner custom class the MyCell class in interface builder, and I have added a UILabel, then in my UICollectionView viewDidLoad I do this:

[self.collectionView registerClass:[MyCell class] forCellWithReuseIdentifier:@"MyCell"];

UINib *cellNib = [UINib nibWithNibName:@"MyCell" bundle:nil];
[self.collectionView registerNib:cellNib forCellWithReuseIdentifier:@"MyCell"];

As well as in this:

- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
MyCell *cell = (MyCell*)[cv dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];


cell.label.text = @"Cell Text";


return cell;
}

However this doesn't work, I receive this error:

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSObject 0x907eca0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key label.'

What did I do wrong? How can I connect a UICollectionViewCell subclass to a xib, and display it in a UICollectionView?

EDIT:

i have do this:

- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath
{

NSString *identifier = @"MyCell";

static BOOL nibMyCellloaded = NO;

if(!nibMyCellloaded)
{
    UINib *nib = [UINib nibWithNibName:@"MyCell" bundle: nil];
    [cv registerNib:nib forCellWithReuseIdentifier:identifier];
    nibMyCellloaded = YES;
}

MyCell *cell = (MyCell*)[cv dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];


cell.labelCell.text = @"Text";


return cell;
}

回答1:

Make sure the cell on the .xib file know what's the type of the cell.

Select the cell on your interface builder

and then on the identity inspector

Subsequently associate your labels with your properties. (I think you already did that)

Then I'd recommend to verify if you already loaded the .xib file on your cellForItemAtIndexPath: method

NSString *identifier = @"MyCell";    

    static BOOL nibMyCellloaded = NO;

    if(!nibMyCellloaded)
    {
        UINib *nib = [UINib nibWithNibName:@"MyCell" bundle: nil];
        [cv registerNib:nib forCellWithReuseIdentifier:identifier];
        nibMyCellloaded = YES;
    }

回答2:

You can find the answer in this document UICollectionView adding UICollectionCell.

Only UICollectionView inside StoryBoard have UICollectionViewCell inside. If use XIB, create a new XIB with CellName.xib, add CollectionViewCell to it, specify name of UICollectionView custom class. After that use registerNib.Sample code: https://github.com/lequysang/TestCollectionViewWithXIB