iOSUICollectionView简单使用
2019-11-14 18:30:22
供稿：网友
首先认识一下UICollectionView
NS_CLASS_AVAILABLE_IOS(6_0) @interface UICollectionView : UIScrollView
UICollectionView%20和%20UICollectionViewController%20类是iOS6%20新引进的API，用于展示集合视图，布局更加灵活，可实现多列布局，用法类似于UITableView%20和%20UITableViewController%20类。
使用UICollectionView%20必须实现UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout这三个协议。
下面给出一些常用方法，具体的使用可以参考Demo:点我下载 %20苹果官方Demo:点我下载
[objc] view%20plaincopy
- (void)viewDidLoad { [super viewDidLoad]; self.title = @"UICollectionView学习"; //通过Nib生成cell，然后注册 Nib的view需要继承 UICollectionViewCell [self.collectionView registerNib:[UINib nibWithNibName:@"SQCollectionCell" bundle:nil] forCellWithReuseIdentifier:kcellIdentifier]; //注册headerView Nib的view需要继承UICollectionReusableView [self.collectionView registerNib:[UINib nibWithNibName:@"SQSupplementaryView" bundle:nil] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:kheaderIdentifier]; //注册footerView Nib的view需要继承UICollectionReusableView [self.collectionView registerNib:[UINib nibWithNibName:@"SQSupplementaryView" bundle:nil] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:kfooterIdentifier]; // self.collectionView.allowsMultipleSelection = YES;//默认为NO,是否可以多选 } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #PRagma mark -CollectionView datasource //section - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 2; } //item个数 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return 6; } // The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath: - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { //重用cell UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kcellIdentifier forIndexPath:indexPath]; //赋值 UIImageView *imageView = (UIImageView *)[cell viewWithTag:1]; UILabel *label = (UILabel *)[cell viewWithTag:2]; NSString *imageName = [NSString stringWithFormat:@"%ld.JPG",(long)indexPath.row]; imageView.image = [UIImage imageNamed:imageName]; label.text = imageName; cell.backgroundColor = [UIColor redColor]; return cell; } - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{ NSString *reuseIdentifier; if ([kind isEqualToString: UICollectionElementKindSectionFooter ]){ reuseIdentifier = kfooterIdentifier; }else{ reuseIdentifier = kheaderIdentifier; } UICollectionReusableView *view = [collectionView dequeueReusableSupplementaryViewOfKind :kind withReuseIdentifier:reuseIdentifier forIndexPath:indexPath]; UILabel *label = (UILabel *)[view viewWithTag:1]; if ([kind isEqualToString:UICollectionElementKindSectionHeader]){ label.text = [NSString stringWithFormat:@"这是header:%d",indexPath.section]; } else if ([kind isEqualToString:UICollectionElementKindSectionFooter]){ view.backgroundColor = [UIColor lightGrayColor]; label.text = [NSString stringWithFormat:@"这是footer:%d",indexPath.section]; } return view; } - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { return CGSizeMake(60, 80); } -(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section { return UIEdgeInsetsMake(15, 15, 5, 15);} -(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{ CGSize size={320,45}; return size; } - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section { CGSize size={320,45}; return size; } - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section { return 10; } - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath]; [cell setBackgroundColor:[UIColor greenColor]]; } - (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath]; [cell setBackgroundColor:[UIColor redColor]]; } 效果图如下：
原文链接：http://blog.csdn.net/Apple_app/article/details/38867123
