UICollectionView——iOS学习连载27

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1.创建布局对象

UICollectionViewFlowLayout *flowLayOut = [[UICollectionViewFlowLayoutalloc] init];

2.设置滑动方向

flowLayOut.scrollDirection =UICollectionViewScrollDirectionHorizontal;

3.设置最小间距

flowLayOut.minimumInteritemSpacing =0;

flowLayOut.minimumLineSpacing =0;

4.设置单元格的大小

flowLayOut.itemSize = CGSizeMake(80,80);

5.初始化CollectionView

UICollectionView *collectionView = [[UICollectionViewalloc] initWithFrame:CGRectMake(0,0, width, height) collectionViewLayout:flowLayout];

6.设置分页

collectionView.pagingEnabled= YES;

7.设置滑动条隐藏

collectionView.showsHorizontalScrollIndicator= NO;

collectionView.showsVerticalScrollIndicator = NO;

8.注册单元格

[collectionViewregisterClass:[ PhotoCell class]forCellWithReuseIdentifier:@"myCell"];

9.设置填充量

collectionView.contentInset = UIEdgeInsetsMake(0, (kScreenWidth -220) / 2, 0, (kScreenWidth -220) / 2);

10.设置scrollView的减速速率（范围0—1）

self.decelerationRate =UIScrollViewDecelerationRateFast

11.#pragma mark -UICollectionViewDataSource

//返回单元格的个数

- (NSInteger)collectionView:(UICollectionView*)collectionView numberOfItemsInSection:(NSInteger)section
{
return self.data.count;
}

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

PhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"myCell"forIndexPath:indexPath];

    cell.backgroundColor= [UIColorcolorWithRed:arc4random() % 10* 0.1 green:arc4random() %10 * 0.1blue:arc4random() % 10* 0.1 alpha:1];

    cell.model= self.data[indexPath.row];
    return cell;

}

12.动态设置单元格的尺寸

- (CGSize)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath*)indexPath
{
return CGSizeMake(80,arc4random() %80);

}

13.当单元格已经不在屏幕上显示时调用的方法（使图片还原）

- (void)collectionView:(UICollectionView*)collectionView didEndDisplayingCell:(PhotoCell*)cell forItemAtIndexPath:(NSIndexPath*)indexPath
{
cell.scrollView.zoomScale= 1;

}

14.设置点击到的图片水平居中

- (void)collectionView:(UICollectionView*)collectionView didSelectItemAtIndexPath:(NSIndexPath*)indexPath
{
[collectionView scrollToItemAtIndexPath:indexPathatScrollPosition:UICollectionViewScrollPositionCenteredHorizontallyanimated:YES];

}

15.设置每个section初始化的偏移量

- (UIEdgeInsets)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(0, (kScreenWidth- self.pageWidth) /2,0, (kScreenWidth- self.pageWidth) /2);

}

16.手指将要离开屏幕时调用的方法(scrollView:滑动对象;velocity:手指离开屏幕的时候，scrollView的滑动速度;targetContentOffset: scrollview停止后的偏移量)

- (void)scrollViewWillEndDragging:(UIScrollView*)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inoutCGPoint*)targetContentOffset

{

}

17.结束显示单元格时调用的方法

- (void)collectionView:(UICollectionView*)collectionView didEndDisplayingCell:(PosterCell*)cell forItemAtIndexPath:(NSIndexPath*)indexPath

{

}

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