UICollectionView

UICollectionViewLayoutAttributes

Class
UICollectionViewLayoutAttributes:NSObject <NSCopying,UIDynamicItem>

UIDynamicItem

@property (nonatomic, readwrite) CGPoint center;@property (nonatomic, readonly) CGRect bounds;@property (nonatomic, readwrite) CGAffineTransform transform;

UICollectionViewLayoutAttributes

@property (nonatomic) CGRect frame;@property (nonatomic) CGPoint center;@property (nonatomic) CGSize size;@property (nonatomic) CATransform3D transform3D;@property (nonatomic) CGRect bounds NS_AVAILABLE_IOS(7_0);@property (nonatomic) CGAffineTransform transform NS_AVAILABLE_IOS(7_0);@property (nonatomic) CGFloat alpha;@property (nonatomic) NSInteger zIndex; // default is 0@property (nonatomic, getter=isHidden) BOOL hidden; // As an optimization, UICollectionView might not create a view for items whose hidden attribute is YES@property (nonatomic, retain) NSIndexPath *indexPath;@property (nonatomic, readonly) UICollectionElementCategory representedElementCategory;@property (nonatomic, readonly) NSString *representedElementKind; // nil when representedElementCategory is UICollectionElementCategoryCell+ (instancetype)layoutAttributesForCellWithIndexPath:(NSIndexPath *)indexPath;+ (instancetype)layoutAttributesForSupplementaryViewOfKind:(NSString *)elementKind withIndexPath:(NSIndexPath *)indexPath;+ (instancetype)layoutAttributesForDecorationViewOfKind:(NSString *)decorationViewKind withIndexPath:(NSIndexPath*)indexPath;