iOS collectionView属性和方法大全

整理了一下collectionView：

1.UICollectionViewLayout

UICollectionViewLayout可以说是UICollectionView的大脑和中枢，它负责了将各个cell、Supplementary View和Decoration Views进行组织，为它们设定各自的属性，Layout决定了UICollectionView是如何显示在界面上的。在展示之前，一般需要生成合适的UICollectionViewLayout子类对象，并将其赋予CollectionView的collectionViewLayout属性

UICollectionViewFlowLayout *collectionViewFlowLayout=[[UICollectionViewFlowLayout alloc]init];

//最小间距

collectionViewFlowLayout.minimumInteritemSpacing=0.0;

//最小线间距

collectionViewFlowLayout.minimumLineSpacing=0.0;

//滚动方向

collectionViewFlowLayout.scrollDirection = UICollectionViewScrollDirectionVertical;

//插入部分

collectionViewFlowLayout.sectionInset = UIEdgeInsetsMake(0.0, 0.0, 0, 0.0);

//它定义了每一个item的大小。通过设定itemSize可以全局地改变所有cell的尺寸，如果想要对某个cell制定尺寸，可以使用-collectionView:layout:sizeForItemAtIndexPath:方法

collectionViewFlowLayout.itemSize=CGSizeMake(120, 120);

collectionViewFlowLayout.estimatedItemSize=CGSizeMake(120, 120);

//由属性scrollDirection确定scroll view的方向，将影响Flow Layout的基本方向和由header及footer确定的section之间的宽度

collectionViewFlowLayout.scrollDirection=UICollectionViewScrollDirectionVertical;

//Header和Footer尺寸 同样地分为全局和部分。需要注意根据滚动方向不同，header和footer的高和宽中只有一个会起作用。垂直滚动时section间宽度为该尺寸的高，而水平滚动时为宽度起作用

collectionViewFlowLayout.headerReferenceSize=CGSizeMake(100, 40);

collectionViewFlowLayout.footerReferenceSize=CGSizeMake(100, 40);

2.UICollectionView的属性

collectionView.backgroundColor=[UIColor whiteColor];

collectionView.delegate=self;

collectionView.dataSource=self;

//允许选择

collectionView.allowsSelection=YES;

//允许多个选择

collectionView.allowsMultipleSelection=YES;

// 注册相关类

[collectionView registerClass:[CCell class] forCellWithReuseIdentifier:@"cell"];

[collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"Header"];

[collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"Footer"];

//也可以用Nib

// [[collectionView registerNib:<#(UINib *)#> forCellWithReuseIdentifier:<#(NSString *)#>]

// collectionView registerNib:<#(UINib *)#> forSupplementaryViewOfKind:<#(NSString *)#> withReuseIdentifier:<#(NSString *)#>

3.UICollectionView的方法

//UICollectionViewDataSource 代理

//每节单元格数

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

{

if (section==0) {

return 6;

}

else

{

return 4;

}

}

//节数

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView

{

return 2;

}

//单元格

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

{

CCell *cell =[collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];

cell.backgroundColor = [UIColor colorWithRed:arc4random()%256/ 255.0 green:arc4random()%256 / 255.0 blue:arc4random()% 256 / 255.0 alpha:1];

cell.myImageView=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"image0.jpg"]];

cell.nameLabel=[[UILabel alloc]init];

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

return cell;

}

//节头节尾

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath

{

if ([kind isEqualToString: UICollectionElementKindSectionFooter]) {

UICollectionReusableView *footer=[collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"Footer" forIndexPath:indexPath];

footer.backgroundColor=[UIColor yellowColor];

UILabel *label=[[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 40)];

label.text=@"label";

label.textAlignment=NSTextAlignmentCenter;

[footer addSubview:label];

return footer;

}

else

{

UICollectionReusableView *Header=[collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"Header" forIndexPath:indexPath];

Header.backgroundColor=[UIColor blueColor];

return Header;

}

}

//UICollectionViewDelegate 代理

//选中时是否高亮

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

{

if (indexPath.row%2==0) {

return YES;

}

return NO;

}

//选中高亮显示后

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

{

NSLog(@"didHighlightItemAtIndexPath");

}

// 允许被选中

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

{

return YES;

}

//允许被取消

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

{

return YES;

}

//选中某个单元格

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

{

NSLog(@"didSelectItemAtIndexPath section=%ld row=%ld",indexPath.section,indexPath.row);

}

//取消某个单元格

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

{

NSLog(@"didDeselectItemAtIndexPath section=%ld row=%ld",indexPath.section,indexPath.row);

}

//高亮不显示

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

{

NSLog(@"didUnhighlightItemAtIndexPath");

}

//即将展示UICollectionViewCell

- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath

{

NSLog(@"willDisplayCell");

}

//即将显示section的footer和header

- (void)collectionView:(UICollectionView *)collectionView willDisplaySupplementaryView:(UICollectionReusableView *)view forElementKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath

{

NSLog(@"willDisplaySupplementaryView");

}

//UICollectionViewCell显示完成

- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath

{

NSLog(@"didEndDisplayingCell");

}

//显示section的footer和header完成

- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingSupplementaryView:(UICollectionReusableView *)view forElementOfKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath

{

NSLog(@"didEndDisplayingSupplementaryView");

}

//是否显示 copy、cut、paste等

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

{

return YES;

}

//是否显示action辅助功能

- (BOOL)collectionView:(UICollectionView *)collectionView canPerformAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender

{

SEL sel=@selector(copy:);

if (sel==action) {

return YES;

}

return NO;

}

//判断选择的是什么action

- (void)collectionView:(UICollectionView *)collectionView performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender

{

SEL sel=@selector(copy:);

if (sel==action) {

NSLog(@"aaaaa");

}

}