iOS CollectionViewController

添加CollectionViewController 的协议

添加控件

@property (nonatomic,strong)UICollectionView *collectionV;

==============创建UICollectionViewControllerFlowLayout 布局对象=============

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

//设置UICollectionView 中 各个单元格的大小

flowLayout.itemSize = CGSizeMake(100 , 200);

//设置该UICollectionView 只支持垂直滚动

//  UICollectionViewScrollDirectionVertical,  垂直

//  UICollectionViewScrollDirectionHorizontal  水平

flowLayout.scrollDirection = UICollectionViewScrollDirectionVertical;

//设置各分区上下左右空白的大小

flowLayout.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10);

//设置两行单元格之间的行距

flowLayout.minimumLineSpacing = 10;

//设置两行单元格之间的间距

flowLayout.minimumInteritemSpacing = 10;

flowLayout.headerReferenceSize = CGSizeMake(self.view.frame.size.width, 30);

flowLayout.footerReferenceSize =  CGSizeMake(self.view.frame.size.width, 30);

//设置布局对象

self.collectionV = [[UICollectionView alloc]initWithFrame:self.view.frame collectionViewLayout:flowLayout];

//设置CollectionView代理

self.collectionV.delegate = self;

self.collectionV.dataSource = self;

//将CollectionView添加到 本View

[self.view addSubview:self.collectionV];

//注册CollectionViewCell

[self.collectionV registerClass:[MyCollectionViewCell class] forCellWithReuseIdentifier:@"cyy"];

//注册CollectionView头视图

[self.collectionV registerClass:[HearderCollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"header"];

//注册CollectionView尾视图

[self.collectionV registerClass:[FooterCollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"footer"];

[self.collectionV reloadData];

-----------------------------    代理方法 ----------------------------

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

//返回数组的个数  3;

return oneArr.count;

}

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

//将数组的单个分区 解出来

NSArray *arr = oneArr[section];

//然后返回单个分区的个数

return arr.count;

}

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

//实现CollectionView的 复用

MyCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cyy" forIndexPath:indexPath];

//给cell 加一个自定义颜色

cell.label.backgroundColor = [self randomColor];

//实现UIImageView.image 的赋值

cell.imageV.image = [UIImage imageNamed:twoArr[indexPath.section][indexPath.row]];

//实现UILabel.text 的赋值

cell.label.text = oneArr[indexPath.section][indexPath.row];

return cell;

}

-(UIColor *)randomColor{

CGFloat r = arc4random() % 300/255.0;

CGFloat g = arc4random() % 300/255.0;

CGFloat b = arc4random() % 300/255.0;

UIColor *color = [UIColor colorWithRed:r green:g blue:b alpha:1];

return color;

}

-(UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{

if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {

HearderCollectionReusableView *hearView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"header" forIndexPath:indexPath];

hearView.hearderLB.text = hearArr[indexPath.row];

return hearView;

}else{

FooterCollectionReusableView *footView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"footer" forIndexPath:indexPath];

footView.footerLB.text = footArr[indexPath.row];

return footView;

}

}