erpsuiteios/Redant Drivers/Apex And Drivers/Detail/Cell/CollectionView/RADetailActionsLayout.m

//
//  RADetailActionsLayout.m
//  Apex And Drivers
//
//  Created by Jack on 2018/6/2.
//  Copyright © 2018年 USAI. All rights reserved.
//

#import "RADetailActionsLayout.h"

@implementation RADetailActionsLayout {
    NSArray *attrs;
}

- (void)prepareLayout {
    
    if (self.delegate) {
        attrs = [self.delegate prepareLayout];
    }
}

- (CGSize)collectionViewContentSize {
    
    CGFloat height = 0;
    if (self.delegate) {
        height = [self.delegate layoutContentHeight];
    }
    return CGSizeMake(self.collectionView.frame.size.width, height);
}


- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect {
    
    __block NSMutableArray *attrsArr = [NSMutableArray array];
    [attrs enumerateObjectsUsingBlock:^(UICollectionViewLayoutAttributes *  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if (CGRectIntersectsRect(rect, obj.frame)) {
            [attrsArr addObject:obj];
        }
    }];
    
    return attrsArr;
}

- (UICollectionViewLayoutAttributes *)layoutAttributesForDecorationViewOfKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath {
    return nil;
}

- (UICollectionViewLayoutAttributes *)layoutAttributesForSupplementaryViewOfKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath {
    return nil;
}

- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewLayoutAttributes *itemtAttrs = [self->attrs objectAtIndex:indexPath.row];
    return itemtAttrs;
}

- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds {
    CGRect oldBounds = self.collectionView.bounds;
    if (!CGSizeEqualToSize(newBounds.size, oldBounds.size)) {
        return YES;
    }
    return NO;
}


@end