关于UICollectionViewCell重用问题
懒人直接上代码
1.
UICollectionViewFlowLayout *flowLayout=[[UICollectionViewFlowLayout alloc] init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
self.collView =[[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth,ScreenHeight-NAVIGATIONBAR_HEIGHT-TABBAR_HEIGHT) collectionViewLayout:flowLayout];
self.collView.dataSource=self;
self.collView.delegate=self;
self.collView.alwaysBounceVertical = YES;
//注册Cell，必须要有
[self.collView registerClass:[LYDianPuGoodsCollectionViewCell class] forCellWithReuseIdentifier:@"cell"];
self.collView.backgroundColor = [UIColor grayColor];
[self.view addSubview: self.collView];
2.
#pragma mark -- UICollectionViewDataSource
//定义展示的UICollectionViewCell的个数
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return self.dianpuArray.count;
}
//定义展示的Section的个数
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
//每个UICollectionView展示的内容
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
LYDianPuGoodsCollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
cell.backgroundColor = [UIColor whiteColor];
if(self.dianpuArray.count>0)
{
cell.labgoodsName.text=self.dianpuArray[indexPath.row];
}
return cell;
}
//定义每个Item 的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake((ScreenWidth-20)/2, (ScreenWidth-20)/2);
}
//定义每个UICollectionView 的 margin
-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(0, 5, 0, 5);
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
return 5;
}
-(CGFloat)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{
return 5;
}
#pragma mark --UICollectionViewDelegate
//UICollectionView被选中时调用的方法
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
[self.collView deselectItemAtIndexPath:indexPath animated:YES];
}
//返回这个UICollectionView是否可以被选择
-(BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
3.
-(id)initWithFrame:(CGRect)frame{
if(self==[super initWithFrame:frame])
{
self.labgoodsName=[[UILabel alloc]init];
self.labgoodsName.font=[UIFont systemFontOfSize:14.0f];
[self addSubview:self.labgoodsName];
}
return self;
}
-(void)layoutSubviews{
self.labgoodsName.frame=CGRectMake((self.width-80)/2, self.height-30, 80, 20);
}
