用UICollectionView实现点击展开收缩的cell

#import "GoodsToSaleViewCell.h"

 

 

 

#import "GoodsOnSaleController.h"

#import "GoodsToSaleViewCell.h"

 

@interface GoodsOnSaleController ()<UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>

 

@property (nonatomic, strong) UICollectionView *collectionView;

@property (nonatomic, strong) NSIndexPath *selectedIndexPath;

 @end

 

@implementation GoodsOnSaleController

 

- (void)viewDidLoad {

        [super viewDidLoad];

        self.navigationController.navigationBar.translucent = NO;

        self.view.backgroundColor = [UIColor whiteColor];

        [self setCollectionView];

}

 

 

 

#pragma mark - setUI

- (void)setCollectionView {

     UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc]init];

     self.collectionView = [[UICollectionView alloc]initWithFrame:self.view.bounds collectionViewLayout:layout];

     self.collectionView.backgroundColor = [UIColor groupTableViewBackgroundColor];

    

    self.collectionView.delegate = self;

    self.collectionView.dataSource = self;

    

    [self.view addSubview:self.collectionView];

    

    // 注册cell

    [self.collectionView registerNib:[UINib nibWithNibName:@"GoodsToSaleViewCell" bundle:nil] forCellWithReuseIdentifier:NSStringFromClass([GoodsToSaleViewCell class])];

   

}

 

 

#pragma mark - UICollectionViewDataSource

 

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {

 

     return 1;

}

 

 

 

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {

 

    return 20;  

}

 

 

 

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

    GoodsToSaleViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([GoodsToSaleViewCell class]) forIndexPath:indexPath];

 

    if (indexPath == _selectedIndexPath) {

        

        cell.layer.borderColor = selectedColor.CGColor;

    }else{

        

        cell.layer.borderColor = normalColor.CGColor;

        

    }

    return cell;

    

}

 

 

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{

    

    GoodsToSaleViewCell *cell = (GoodsToSaleViewCell *)[self collectionView:collectionView cellForItemAtIndexPath:indexPath];

 

    if (_selectedIndexPath == indexPath) {

        

        cell.layer.borderColor = normalColor.CGColor;

        _selectedIndexPath = nil;

        

    }else{

        

        if (_selectedIndexPath != nil) {

            

            GoodsToSaleViewCell *selectedCell = (GoodsToSaleViewCell *)[self collectionView:collectionView cellForItemAtIndexPath:_selectedIndexPath];

            

            selectedCell.layer.borderColor = normalColor.CGColor;

                

            

        }

        

        self.selectedIndexPath = indexPath;

        cell.layer.borderColor = selectedColor.CGColor;

 

    }

    

    [self.collectionView reloadData];

    

}

 

 

 

#pragma mark - UICollectionViewDelegateFlowLayout

 

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {

 

    return UIEdgeInsetsMake(0, 0, 0, 0);

    

}

 

 

 

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{

 

    if (indexPath == _selectedIndexPath) {

        

        return CGSizeMake(self.collectionView.frame.size.width - 20, 175);

    }  

    return CGSizeMake(self.collectionView.frame.size.width - 20, 100);

 

}

 

 

 

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

}

 

 

 

@end