collectionView的案例

1. #import "ViewController.h"
2. #import "CollectionViewCell.h"
3. @interface ViewController ()<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>
4. @property (weak, nonatomic) IBOutlet UICollectionView *collectionCell;
5. @end

1. @implementation ViewController
2. - (void)viewDidLoad
3. {
4. [super viewDidLoad];
5. self.collectionCell.backgroundColor = [UIColor greenColor];
6. self.collectionCell.dataSource = self;
7. self.collectionCell.delegate = self;
8. }
9. #pragma mark -- UICollectionViewDataSource
10. //设置collectionCell的个数
11. -(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
12. {
13. return 9;
14. }
15. //定义展示的Section的个数
16. -(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
17. {
18. return 1;
19. }
20. //每个UICollectionView展示的内容
21. -(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
22. {
23. //使用collectionCell进行注册，通过xib文件加载视图
24. [self.collectionCell registerNib:[UINib nibWithNibName:@"myCell" bundle:nil]
25. forCellWithReuseIdentifier:@"mycell"];
26. CollectionViewCell *cell = (CollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"mycell" forIndexPath:indexPath];
27. //图片名称
28. NSString *imageToLoad = [NSString stringWithFormat:@"%ld.jpg", indexPath.row];
29. //加载图片
30. cell.iamgeView.image = [UIImage imageNamed:imageToLoad];
31. //设置label文字
32. cell.labeiInfo.text = [NSString stringWithFormat:@"image%ld",indexPath.row];
33. return cell;
34. }
35. //设置每个各自的大小
36. -(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
37. {
38. return CGSizeMake(170, 170);
39. }
40. //定义每个UICollectionView 的 margin
41. -(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
42. {
43. return UIEdgeInsetsMake(5, 5, 5, 5);
44. }
45. //UICollectionView被选中时调用的方法
46. -(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
47. {
48. UICollectionViewCell * cell = (UICollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
49. cell.backgroundColor = [UIColor whiteColor];
50. }
51. //返回这个UICollectionView是否可以被选择
52. -(BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath
53. {
54. return YES;
55. }
56. //隐藏状态栏
57. -(BOOL)prefersStatusBarHidden
58. {
59. return YES;
60. }
61. @end

程序运行结果：