iOS UICollectionView简单使用
2015-07-29 11:16
591 查看
首先认识一下UICollectionView
[objc] viewplaincopy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
NS_CLASS_AVAILABLE_IOS(6_0) @interface UICollectionView : UIScrollView
UICollectionView 和 UICollectionViewController 类是iOS6 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 和 UITableViewController 类。
使用UICollectionView 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
苹果官方Demo:点我下载
[objc] viewplaincopy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
- (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;
}
// The view that is returned must be retrieved from a call to -dequeueReusableSupplementaryViewOfKind:withReuseIdentifier:forIndexPath:
- (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;
}
//定义每个UICollectionViewCell 的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake(60, 80);
}
//定义每个Section 的 margin
-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(15, 15, 5, 15);//分别为上、左、下、右
}
//返回头headerView的大小
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{
CGSize size={320,45};
return size;
}
//返回头footerView的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section
{
CGSize size={320,45};
return size;
}
//每个section中不同的行之间的行间距
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
return 10;
}
//每个item之间的间距
//- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
//{
// return 100;
//}
//选择了某个cell
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
[cell setBackgroundColor:[UIColor greenColor]];
}
//取消选择了某个cell
- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
[cell setBackgroundColor:[UIColor redColor]];
}
效果图如下:
相关文章推荐
- 玩转Android---UI篇---布局
- 调整UI颜色时注意事项
- 玩转Android---UI篇---TabWidget(切换卡)
- 玩转Android---UI篇---Spinner(下拉列表)
- 玩转Android---UI篇---Gallery(画廊视图)
- 玩转Android---UI篇---GridView(网格布局)
- [UIImage resizableImageWithCapInsets:]使用注意
- 玩转Andorid---UI篇---两种进度条(ProgressBar)
- Android开发UI之Action Bar
- Arduino蓝牙小车说明
- Android BLE 蓝牙低功耗教程,中央BluetoothGatt和周边BluetoothGattServer的实现
- 高效的线程安全队列ConcurrentQueue<T>(上)
- Arduino通过串口控制舵机角度实验
- Android: Bluetooth Input 连接流程分析
- ORA-00265: instance recovery required, cannot set ARCHIVELOG mode
- Foundation Framework 基本数据封装 NSNumber、NSValue、NSData
- Respond.js让IE6-8支持CSS3 Media Query
- UITabbarController的子类,init 和 viewDidLoad 的顺序
- iOS开发之UIImage等比缩放
- 1017. Queueing at Bank (25)