嘗試創建UICollectionViewCell時聲明失敗

我正在嘗試使用自定義筆尖創建UICollectionView。要做到這一點，我在做我與UITableView中做同樣的事情：嘗試創建UICollectionViewCell時聲明失敗

MyCollectionViewController.m

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    myCollectionView.delegate = self; 
    myCollectionView.dataSource = self; 
} 

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath 
{ 
MyCollectionCell *cell = [MyCollectionCell newCellOrReuse:collectionView atIndexPath:indexPath]; 

    return cell; 
}

MyCollectionCell.m

+ (MyCollectionCell *)newCell 
{ 
    UIViewController *vc = [[UIViewController alloc] initWithNibName:@"MyCollectionCell" bundle:nil]; 
    MyCollectionCell *cell = (MyCollectionCell *)vc.view; 
    [cell initCell]; 
    return cell; 
} 

+ (MyCollectionCell *)reuse:(UICollectionView *)collectionView atIndexPath:(NSIndexPath *)indexPath 
{ 
    NSString *rid = @"MyCollectionCell"; 
    return (MyCollectionCell *)[collectionView dequeueReusableCellWithReuseIdentifier:rid forIndexPath:indexPath]; 
} 

+ (MyCollectionCell *)newCellOrReuse:(UICollectionView *)collectionView atIndexPath:(NSIndexPath *)indexPath 
{ 
    MyCollectionCell *cell = [MyCollectionCell reuse:collectionView atIndexPath:indexPath]; 
    if (!cell) cell = [MyCollectionCell newCell]; 
    return cell; 
} 

- (void) initCell 
{ 
}

我得到一個錯誤

*** Assertion failure in -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:], /SourceCache/UIKit/UIKit-2380.17/UICollectionView.m:2249

在這條線

return (MyCollectionCell *)[collectionView dequeueReusableCellWithReuseIdentifier:rid forIndexPath:indexPath];

我真的不知道發生了什麼事。它與重用有關，因爲如果我只撥打[MyCollectionCell newCell];它就會起作用。其實它只適用於iOS6。在iOS7我得到*** Assertion failure in -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:], /SourceCache/UIKit_Sim/UIKit-2903.23/UICollectionView.m:1367

感謝您的幫助！

來源

2014-02-07 Nicolas Roy

您需要檢查' - （空）registerNib：（UINib *）筆尖forCellWithReuseIdentifier：（的NSString *）identifier'上'UICollectionView' –

還應該有一個兩行高於或低於該給出更具體的原因。 – Kevin

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    myCollectionView.delegate = self; 
    myCollectionView.dataSource = self; 

    [collectionView registerNib:[UINib nibWithNibName:@"MyCollectionCell" bundle:nil] forCellWithReuseIdentifier:@"MyCollectionCell"]; 
} 

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { 
    NSString *rid = @"MyCollectionCell"; 
    return (MyCollectionCell *)[collectionView dequeueReusableCellWithReuseIdentifier:rid forIndexPath:indexPath]; 
}

然後在MyCollectionCell.m廢除所有類的方法，並從awakeFromNib調用initCell。即：

-(void)awakeFromNib { 
    [super awakeFromNib]; 
    [self initCell]; 
}

來源

2014-02-07 16:47:36

嘗試創建UICollectionViewCell時聲明失敗

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