collectionView的案例

#import "ViewController.h"

#import "CollectionViewCell.h"

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

@property (weak, nonatomic) IBOutlet UICollectionView *collectionCell;

@end

@implementation ViewController

- (void)viewDidLoad

{

[super viewDidLoad];

self.collectionCell.backgroundColor = [UIColor greenColor];

self.collectionCell.dataSource = self;

self.collectionCell.delegate = self;

}

#pragma mark -- UICollectionViewDataSource

//设置collectionCell的个数

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

{

return 9;

}

//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

{

//使用collectionCell进行注册，通过xib文件加载视图

[self.collectionCell registerNib:[UINib nibWithNibName:@"myCell" bundle:nil]

forCellWithReuseIdentifier:@"mycell"];

CollectionViewCell *cell = (CollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"mycell" forIndexPath:indexPath];

//图片名称

NSString *imageToLoad = [NSString stringWithFormat:@"%ld.jpg", indexPath.row];

//加载图片

cell.iamgeView.image = [UIImage imageNamed:imageToLoad];

//设置label文字

cell.labeiInfo.text = [NSString stringWithFormat:@"image%ld",indexPath.row];

return cell;

}

//设置每个各自的大小

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

{

return CGSizeMake(170, 170);

}

//定义每个UICollectionView 的 margin

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

{

return UIEdgeInsetsMake(5, 5, 5, 5);

}

//UICollectionView被选中时调用的方法

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

{

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

cell.backgroundColor = [UIColor whiteColor];

}

//返回这个UICollectionView是否可以被选择

-(BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath

{

return YES;

}

//隐藏状态栏

-(BOOL)prefersStatusBarHidden

{

return YES;

}

@end

程序运行结果：