iOSUICollectionView簡(jiǎn)單使用

2019-11-14 18:30:22

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首先認(rèn)識(shí)一下UICollectionView

[objc] view plain copy

NS_CLASS_AVAILABLE_IOS(6_0) @interface UICollectionView : UIScrollView

UICollectionView%20和%20UICollectionViewController%20類(lèi)是iOS6%20新引進(jìn)的API，用于展示集合視圖，布局更加靈活，可實(shí)現(xiàn)多列布局，用法類(lèi)似于UITableView%20和%20UITableViewController%20類(lèi)。

使用UICollectionView%20必須實(shí)現(xiàn)UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout這三個(gè)協(xié)議。

下面給出一些常用方法，具體的使用可以參考Demo:

- (void)viewDidLoad

{

[super viewDidLoad];

self.title = @"UICollectionView學(xué)習(xí)";

//通過(guò)Nib生成cell，然后注冊(cè) Nib的view需要繼承 UICollectionViewCell

[self.collectionView registerNib:[UINib nibWithNibName:@"SQCollectionCell" bundle:nil] forCellWithReuseIdentifier:kcellIdentifier];

//注冊(cè)headerView Nib的view需要繼承UICollectionReusableView

[self.collectionView registerNib:[UINib nibWithNibName:@"SQSupplementaryView" bundle:nil] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:kheaderIdentifier];

//注冊(cè)footerView Nib的view需要繼承UICollectionReusableView

[self.collectionView registerNib:[UINib nibWithNibName:@"SQSupplementaryView" bundle:nil] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:kfooterIdentifier];

self.collectionView.allowsMultlong)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:@"這是header:%d",indexPath.section];

}

else if ([kind isEqualToString:UICollectionElementKindSectionFooter]){

view.backgroundColor = [UIColor lightGrayColor];

label.text = [NSString stringWithFormat:@"這是footer:%d",indexPath.section];

}

return view;

}

//定義每個(gè)UICollectionViewCell 的大小

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

{

return CGSizeMake(60, 80);

}

//定義每個(gè)Section 的 margin

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

{

return UIEdgeInsetsMake(15, 15, 5, 15);//分別為上、左、下、右

}

//返回頭headerView的大小

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{

CGSize size={320,45};

return size;

}

//返回頭footerView的大小

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section

{

CGSize size={320,45};

return size;

}

//每個(gè)section中不同的行之間的行間距

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section

{

return 10;

}

//每個(gè)item之間的間距

//- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section

//{

// return 100;

//}

//選擇了某個(gè)cell

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

{

UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];

[cell setBackgroundColor:[UIColor greenColor]];

}

//取消選擇了某個(gè)cell

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

{

UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];

[cell setBackgroundColor:[UIColor redColor]];

}

效果圖如下：

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iOSUICollectionView簡(jiǎn)單使用

首先認(rèn)識(shí)一下UICollectionView

下面給出一些常用方法，具體的使用可以參考Demo: