我的ios应用程序因以下异常而崩溃：
void HandleExceptions(NSException *__strong):875 ERROR: uncaught exception: no UICollectionViewLayoutAttributes instance for -layoutAttributesForDecorationViewOfKindOfKind: ColorDecoratorView at path <NSIndexPath: 0x7d843ec0> {length = 3, path = 3 - 0}
请告诉我“-outoutAttributesForDecorationViewOfKindOfKind没有UICollectionViewLayoutAttributes实例”是什么意思？我应该在哪里找麻烦拍摄它？
我已经明白了这种方法：
- (UICollectionViewLayoutAttributes *)layoutAttributesForDecorationViewOfKind:(NSString *)decorationViewKind atIndexPath:(NSIndexPath *)indexPath
但是当我旋转屏幕时，我得到以下异常：
uncaught exception: layout attributes for supplementary item at index path (<NSIndexPath: 0x79ef2c80> {length = 2, path = 1 - 0}) changed from <UICollectionViewLayoutAttributes: 0x82e76830> index path: (<NSIndexPath: 0x79ebf750> {length = 2, path = 1 - 0}); element kind: (ColorDecoratorView); frame = (72 2513; 293.333 252); to <UICollectionViewLayoutAttributes: 0x79ef9380> index path: (<NSIndexPath: 0x79ef2c80> {length = 2, path = 1 - 0}); element kind: (ColorDecoratorView); frame = (0 825; 1024 -327); without invalidating the layout
谢谢。
答案 0 :(得分：0)
- (UICollectionViewLayoutAttributes *)layoutAttributesForDecorationViewOfKind:(NSString *)decorationViewKind atIndexPath:(NSIndexPath *)indexPath
返回值为
A layout attributes object containing the information to apply to the decoration view.
我想说实现这个方法。这样的事情
UICollectionViewLayoutAttributes *attrs = [UICollectionViewLayoutAttributes layoutAttributesForDecorationViewOfKind:decorationViewKind withIndexPath:indexPath];
attrs.frame = cgrectmake (x,x,x,x);
return attrs;
看起来你的单元格正在从集合视图中请求一些layoutAttributes。 NSIndexPath似乎是[L = 3，path = 3];
获取indexPath.row并进一步调查cellForRowAtIndexPath。