OC瀑布流可拓展headView
2016-06-17 15:03
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1.SWVideoCollectionView.h 将collectionView封装在SWVideoCollectionView类中。
#import <UIKit/UIKit.h>
@protocol SWVideoCollectionViewDelegate <NSObject>
/**
* 点击cell方法
*/
- (void)videoCollectionView:(UIView *)view index:(NSInteger)index;
/**
* 点击头像方法
*/
- (void)videoCollectionPhotoView:(UIView *)view index:(NSInteger)index;
@optional
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString
*)kind atIndexPath:(NSIndexPath *)indexPath;
- (void)scrollViewDidScroll:(UIView *)view scrollView:(UIScrollView *)scrollView
contentOffset:(CGPoint)contentOffset;
@end
@interface SWVideoCollectionView :UIView
- (instancetype)initWithFrame:(CGRect)frame headerReferenceSize:(CGSize)headerReferenceSize
headClass:(NSString *)headClass;
@property(nonatomic,weak)UICollectionView
*collectionView;
@property(nonatomic,strong)NSArray
*dataLists;
@property(assign)id<SWVideoCollectionViewDelegate>delegate;
@end
1.SWVideoCollectionView.m
#import "SWVideoCollectionView.h"
#import "SWImgCollectionFlowLayout.h"
#import "SWMainDetailCollectionViewCell.h"
#import "SWVideoListModel.h"
#define cellCount 2
@interface
SWVideoCollectionView ()<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout,SWMainDetailCollectionViewCellDelegate>
@property(nonatomic,copy)NSString
*headClass;
@end
static NSString *mainDetailId =@"mainDetailId";
static NSString *headScrollId =@"headScrollId";
@implementation SWVideoCollectionView
- (instancetype)initWithFrame:(CGRect)frame headerReferenceSize:(CGSize)headerReferenceSize
headClass:(NSString *)headClass {
if (self = [superinitWithFrame:frame])
{
SWImgCollectionFlowLayout *layOut = [[SWImgCollectionFlowLayoutalloc]
init]
1ea4f
;
if (headerReferenceSize.height !=0 && headerReferenceSize.width
!=0) {
layOut.headerReferenceSize = headerReferenceSize;
}
layOut.columnCount =cellCount;
layOut.minimumLineSpacing =kkPadding *
0.5;
layOut.minimumInteritemSpacing =kkPadding *0.5;
layOut.sectionInset =UIEdgeInsetsMake(kkPadding *0.5,
kkPadding *0.5,
kkPadding *0.5,
kkPadding *0.5);
UICollectionView *collectionView = [[UICollectionViewalloc]
initWithFrame:self.boundscollectionViewLayout:layOut];
collectionView.tag =self.tag;
self.collectionView = collectionView;
collectionView.showsHorizontalScrollIndicator =NO;
collectionView.showsVerticalScrollIndicator =NO;
[collectionView registerClass:[SWMainDetailCollectionViewCellclass]
forCellWithReuseIdentifier:mainDetailId];
if (headClass !=nil) {
self.headClass = headClass;
[collectionView registerClass:NSClassFromString(headClass)forSupplementaryViewOfKind:UICollectionElementKindSectionHeaderwithReuseIdentifier:headScrollId];
}
collectionView.backgroundColor =kkLightGrayBg;
collectionView.dataSource =self;
collectionView.delegate =self;
[selfaddSubview:collectionView];
}
returnself;
}
#pragma mark - collectionView代理
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
if (!self.dataLists ||self.dataLists.count
==0) {
SWVideoListModel *model = [[SWVideoListModelalloc]
init];
model.goods_id =@"-1";
self.dataLists = [NSArrayarrayWithObjects:model,
nil];
}
returnself.dataLists.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath
*)indexPath {
SWMainDetailCollectionViewCell *cell = [collectionViewdequeueReusableCellWithReuseIdentifier:mainDetailIdforIndexPath:indexPath];
cell.tag = indexPath.row;
cell.delegate =self;
cell.videoModel =self.dataLists[indexPath.row];
return cell;
}
#pragma mark - 点击Cell
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath
*)indexPath {
SWVideoListModel *listModel =self.dataLists[indexPath.row];
if ([listModel.goods_idisEqualToString:@"-1"])
{
return;
}
[self.delegatevideoCollectionView:selfindex:indexPath.row];
}
#pragma mark - 点击头像
- (void)mainDetailCollectionViewCell:(UICollectionViewCell *)cell {
SWVideoListModel *listModel =self.dataLists[cell.tag];
if ([listModel.goods_idisEqualToString:@"-1"])
{
return;
}
[self.delegatevideoCollectionPhotoView:selfindex:cell.tag];
}
#pragma mark - cell的大小用于瀑布流计算值
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout
*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
SWVideoListModel *info =self.dataLists[indexPath.row];
if ([info.goods_idisEqualToString:@"-1"])
{
returnCGSizeMake(0,0);
}
CGFloat itemWidth = (self.frame.size.width
- (cellCount + 1) *kkPadding *
0.5) /cellCount;
CGFloat itemH = itemWidth;
if (info.default_image_height >0
&& info.default_image_width >0) {
itemH = [info.default_image_heightfloatValue] * itemWidth / [info.default_image_widthfloatValue];
}
//其他文字高度设置
CGFloat marin =kkPadding *
1.5;
CGFloat txtHeight = marin;//距离下边距距离
txtHeight += 35 *0.5;//头像高度
CGFloat titleHeight = [info._descriptionboundingHeightWithWidth:itemWidth
-kkPadding dict:kkFont13];
txtHeight += titleHeight;
itemH += txtHeight;
returnCGSizeMake(itemWidth, itemH);
}
#pragma mark - 拓展头文件可选
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString
*)kind atIndexPath:(NSIndexPath *)indexPath {
return [self.delegatecollectionView:collectionViewviewForSupplementaryElementOfKind:kindatIndexPath:indexPath];
}
#pragma mark - 监听滚动的偏移量可选
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if ([self.delegaterespondsToSelector:@selector(scrollViewDidScroll:scrollView:contentOffset:)])
{
[self.delegatescrollViewDidScroll:selfscrollView:scrollView
contentOffset:scrollView.contentOffset];
}
}
#pragma mark - 设置数据源
- (void)setDataLists:(NSArray *)dataLists {
_dataLists = dataLists;
[self.collectionViewreloadData];
}
@end
3.自定义SWHeadScrollViewCell、SWMainDetailCollectionViewCell。实现 mainDetailCollectionViewCell代理
。重写layoutSubviews
4.自定义UICollectionViewFlowLayout UICollectionViewFlowLayout.m
#import "SWImgCollectionFlowLayout.h"
@interface
SWImgCollectionFlowLayout ()
@property (nonatomic,strong)
NSMutableDictionary *attributes;
@property (nonatomic,strong)
NSMutableArray *colArr;
@property (nonatomic,assign)
UIEdgeInsets edgeInsets;
@property (nonatomic,weak)
id<UICollectionViewDelegateFlowLayout> delegate;
@property(nonatomic,strong)NSMutableArray
*layoutAttributesArray;
@end
@implementation SWImgCollectionFlowLayout
- (void)prepareLayout {
// 初始化
self.attributes = [[NSMutableDictionaryalloc]
init];
self.layoutAttributesArray = [NSMutableArrayarray];
self.colArr = [NSMutableArrayarrayWithCapacity:self.columnCount];
self.delegate = (id<UICollectionViewDelegateFlowLayout>)self.collectionView.delegate;
// 获取总的个数
NSUInteger itemCount = [self.collectionViewnumberOfItemsInSection:0];
if (!itemCount) {
return;
}
//_colArr 用来存放相邻的三个高度
CGFloat top =.0f;
for (NSUInteger idx =0; idx <
self.columnCount; idx++) {
[_colArraddObject:[NSNumbernumberWithFloat:top]];
}
//追加头文件布局.
NSArray *attributesArray1 = [superlayoutAttributesForElementsInRect:CGRectMake(0,0,self.collectionView.frame.size.width,self.collectionView.frame.size.height)];
for (UICollectionViewLayoutAttributes *headAttributesin attributesArray1)
{
if (headAttributes.representedElementKind ==UICollectionElementKindSectionHeader)
{
[self.layoutAttributesArrayaddObject:headAttributes];
}
}
// 遍历所有的item，重新布局
for (NSUInteger idx =0; idx < itemCount; idx++) {
[selflayoutItemAtIndexPath:[NSIndexPathindexPathForItem:idx
inSection:0]];
}
}
//
- (void)layoutItemAtIndexPath:(NSIndexPath *)indexPath {
// 获取collectionView的edgeInsets
UIEdgeInsets edgeInsets =self.sectionInset;
if ([self.delegaterespondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)])
{
edgeInsets = [self.delegatecollectionView:self.collectionViewlayout:selfinsetForSectionAtIndex:indexPath.row];
}
self.edgeInsets = edgeInsets;
// 获取collectionView的itemSize
CGSize itemSize =self.itemSize;
if ([self.delegaterespondsToSelector:@selector(collectionView:layout:sizeForItemAtIndexPath:)])
{
itemSize = [self.delegatecollectionView:self.collectionViewlayout:selfsizeForItemAtIndexPath:indexPath];
}
// 遍历相邻三个高度获取最小高度
NSUInteger col =0;
CGFloat shortHeight = [[_colArrfirstObject]
floatValue];
for (NSUInteger idx =0; idx <
_colArr.count; idx++) {
CGFloat height = [_colArr[idx]floatValue];
if (height < shortHeight) {
shortHeight = height;
col = idx;
}
}
// 得到最小高度的当前Y坐标起始高度
float top = [[_colArrobjectAtIndex:col]
floatValue];
//追加头文件布局.
CGFloat headLastY =0;
NSArray *attributesArray1 = [superlayoutAttributesForElementsInRect:CGRectMake(0,0,self.collectionView.frame.size.width,self.collectionView.frame.size.height)];
for (UICollectionViewLayoutAttributes *headAttributesin attributesArray1)
{
if (headAttributes.representedElementKind ==UICollectionElementKindSectionHeader)
{
headLastY = headAttributes.frame.size.height;
}
}
top = top < headLastY?(top+headLastY):top;
// 设置当前cell的frame
CGRect frame =CGRectMake(edgeInsets.left + col * (edgeInsets.left
+ itemSize.width), top + edgeInsets.top, itemSize.width, itemSize.height);
// 把对应的indexPath存放到字典中保存
[_attributessetObject:indexPath
forKey:NSStringFromCGRect(frame)];
UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributeslayoutAttributesForCellWithIndexPath:indexPath];
attributes.frame = frame;
[self.layoutAttributesArrayaddObject:attributes];
// 跟新colArr数组中的高度
[_colArrreplaceObjectAtIndex:colwithObject:[NSNumbernumberWithFloat:top
+ edgeInsets.top + itemSize.height]];
}
// 系统方法，获取当前可视界面显示的UICollectionViewLayoutAttributes数组
- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect {
returnself.layoutAttributesArray;
}
// 更新对应UICollectionViewLayoutAttributes的frame
- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributeslayoutAttributesForCellWithIndexPath:indexPath];
for (NSString *framein
_attributes) {
if (_attributes[frame] == indexPath) {
attributes.frame =CGRectFromString(frame);
}
}
return attributes;
}
- (CGSize)collectionViewContentSize {
CGSize size =self.collectionView.frame.size;
CGFloat maxHeight = [[_colArrfirstObject]
floatValue];
//查找最高的列的高度
for (NSUInteger idx =0; idx <
_colArr.count; idx++) {
CGFloat colHeight = [_colArr[idx]floatValue];
if (colHeight > maxHeight) {
maxHeight = colHeight;
}
}
size.height = maxHeight +self.edgeInsets.bottom;
return size;
}
5.使用。
//列表集合
SWVideoCollectionView *videoView = [[SWVideoCollectionViewalloc]
initWithFrame:self.boundsheaderReferenceSize:CGSizeZeroheadClass:nil];
videoView.delegate =self;
self.videoView = videoView;
videoView.tag =self.tag;
self.collectionView = videoView.collectionView;
[self.collectionViewaddHeaderWithTarget:selfaction:@selector(getUp:)];
[self.collectionViewaddFooterWithTarget:selfaction:@selector(getDown:)];
[selfaddSubview:videoView];
//首页集合
SWVideoCollectionView *mainVideoView = [[SWVideoCollectionViewalloc]
initWithFrame:self.boundsheaderReferenceSize:CGSizeMake(frame.size.width,
frame.size.width *0.65 +
30)headClass:@"SWHeadScrollViewCell"];
mainVideoView.delegate =self;
self.mainVideoView = mainVideoView;
mainVideoView.tag =self.tag;
self.collectionViewMain = mainVideoView.collectionView;
[self.collectionViewMainaddHeaderWithTarget:selfaction:@selector(getUp:)];
[self.collectionViewMainaddFooterWithTarget:selfaction:@selector(getDown:)];
[selfaddSubview:mainVideoView];
#import <UIKit/UIKit.h>
@protocol SWVideoCollectionViewDelegate <NSObject>
/**
* 点击cell方法
*/
- (void)videoCollectionView:(UIView *)view index:(NSInteger)index;
/**
* 点击头像方法
*/
- (void)videoCollectionPhotoView:(UIView *)view index:(NSInteger)index;
@optional
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString
*)kind atIndexPath:(NSIndexPath *)indexPath;
- (void)scrollViewDidScroll:(UIView *)view scrollView:(UIScrollView *)scrollView
contentOffset:(CGPoint)contentOffset;
@end
@interface SWVideoCollectionView :UIView
- (instancetype)initWithFrame:(CGRect)frame headerReferenceSize:(CGSize)headerReferenceSize
headClass:(NSString *)headClass;
@property(nonatomic,weak)UICollectionView
*collectionView;
@property(nonatomic,strong)NSArray
*dataLists;
@property(assign)id<SWVideoCollectionViewDelegate>delegate;
@end
1.SWVideoCollectionView.m
#import "SWVideoCollectionView.h"
#import "SWImgCollectionFlowLayout.h"
#import "SWMainDetailCollectionViewCell.h"
#import "SWVideoListModel.h"
#define cellCount 2
@interface
SWVideoCollectionView ()<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout,SWMainDetailCollectionViewCellDelegate>
@property(nonatomic,copy)NSString
*headClass;
@end
static NSString *mainDetailId =@"mainDetailId";
static NSString *headScrollId =@"headScrollId";
@implementation SWVideoCollectionView
- (instancetype)initWithFrame:(CGRect)frame headerReferenceSize:(CGSize)headerReferenceSize
headClass:(NSString *)headClass {
if (self = [superinitWithFrame:frame])
{
SWImgCollectionFlowLayout *layOut = [[SWImgCollectionFlowLayoutalloc]
init]
1ea4f
;
if (headerReferenceSize.height !=0 && headerReferenceSize.width
!=0) {
layOut.headerReferenceSize = headerReferenceSize;
}
layOut.columnCount =cellCount;
layOut.minimumLineSpacing =kkPadding *
0.5;
layOut.minimumInteritemSpacing =kkPadding *0.5;
layOut.sectionInset =UIEdgeInsetsMake(kkPadding *0.5,
kkPadding *0.5,
kkPadding *0.5,
kkPadding *0.5);
UICollectionView *collectionView = [[UICollectionViewalloc]
initWithFrame:self.boundscollectionViewLayout:layOut];
collectionView.tag =self.tag;
self.collectionView = collectionView;
collectionView.showsHorizontalScrollIndicator =NO;
collectionView.showsVerticalScrollIndicator =NO;
[collectionView registerClass:[SWMainDetailCollectionViewCellclass]
forCellWithReuseIdentifier:mainDetailId];
if (headClass !=nil) {
self.headClass = headClass;
[collectionView registerClass:NSClassFromString(headClass)forSupplementaryViewOfKind:UICollectionElementKindSectionHeaderwithReuseIdentifier:headScrollId];
}
collectionView.backgroundColor =kkLightGrayBg;
collectionView.dataSource =self;
collectionView.delegate =self;
[selfaddSubview:collectionView];
}
returnself;
}
#pragma mark - collectionView代理
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
if (!self.dataLists ||self.dataLists.count
==0) {
SWVideoListModel *model = [[SWVideoListModelalloc]
init];
model.goods_id =@"-1";
self.dataLists = [NSArrayarrayWithObjects:model,
nil];
}
returnself.dataLists.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath
*)indexPath {
SWMainDetailCollectionViewCell *cell = [collectionViewdequeueReusableCellWithReuseIdentifier:mainDetailIdforIndexPath:indexPath];
cell.tag = indexPath.row;
cell.delegate =self;
cell.videoModel =self.dataLists[indexPath.row];
return cell;
}
#pragma mark - 点击Cell
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath
*)indexPath {
SWVideoListModel *listModel =self.dataLists[indexPath.row];
if ([listModel.goods_idisEqualToString:@"-1"])
{
return;
}
[self.delegatevideoCollectionView:selfindex:indexPath.row];
}
#pragma mark - 点击头像
- (void)mainDetailCollectionViewCell:(UICollectionViewCell *)cell {
SWVideoListModel *listModel =self.dataLists[cell.tag];
if ([listModel.goods_idisEqualToString:@"-1"])
{
return;
}
[self.delegatevideoCollectionPhotoView:selfindex:cell.tag];
}
#pragma mark - cell的大小用于瀑布流计算值
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout
*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
SWVideoListModel *info =self.dataLists[indexPath.row];
if ([info.goods_idisEqualToString:@"-1"])
{
returnCGSizeMake(0,0);
}
CGFloat itemWidth = (self.frame.size.width
- (cellCount + 1) *kkPadding *
0.5) /cellCount;
CGFloat itemH = itemWidth;
if (info.default_image_height >0
&& info.default_image_width >0) {
itemH = [info.default_image_heightfloatValue] * itemWidth / [info.default_image_widthfloatValue];
}
//其他文字高度设置
CGFloat marin =kkPadding *
1.5;
CGFloat txtHeight = marin;//距离下边距距离
txtHeight += 35 *0.5;//头像高度
CGFloat titleHeight = [info._descriptionboundingHeightWithWidth:itemWidth
-kkPadding dict:kkFont13];
txtHeight += titleHeight;
itemH += txtHeight;
returnCGSizeMake(itemWidth, itemH);
}
#pragma mark - 拓展头文件可选
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString
*)kind atIndexPath:(NSIndexPath *)indexPath {
return [self.delegatecollectionView:collectionViewviewForSupplementaryElementOfKind:kindatIndexPath:indexPath];
}
#pragma mark - 监听滚动的偏移量可选
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if ([self.delegaterespondsToSelector:@selector(scrollViewDidScroll:scrollView:contentOffset:)])
{
[self.delegatescrollViewDidScroll:selfscrollView:scrollView
contentOffset:scrollView.contentOffset];
}
}
#pragma mark - 设置数据源
- (void)setDataLists:(NSArray *)dataLists {
_dataLists = dataLists;
[self.collectionViewreloadData];
}
@end
3.自定义SWHeadScrollViewCell、SWMainDetailCollectionViewCell。实现 mainDetailCollectionViewCell代理
。重写layoutSubviews
4.自定义UICollectionViewFlowLayout UICollectionViewFlowLayout.m
#import "SWImgCollectionFlowLayout.h"
@interface
SWImgCollectionFlowLayout ()
@property (nonatomic,strong)
NSMutableDictionary *attributes;
@property (nonatomic,strong)
NSMutableArray *colArr;
@property (nonatomic,assign)
UIEdgeInsets edgeInsets;
@property (nonatomic,weak)
id<UICollectionViewDelegateFlowLayout> delegate;
@property(nonatomic,strong)NSMutableArray
*layoutAttributesArray;
@end
@implementation SWImgCollectionFlowLayout
- (void)prepareLayout {
// 初始化
self.attributes = [[NSMutableDictionaryalloc]
init];
self.layoutAttributesArray = [NSMutableArrayarray];
self.colArr = [NSMutableArrayarrayWithCapacity:self.columnCount];
self.delegate = (id<UICollectionViewDelegateFlowLayout>)self.collectionView.delegate;
// 获取总的个数
NSUInteger itemCount = [self.collectionViewnumberOfItemsInSection:0];
if (!itemCount) {
return;
}
//_colArr 用来存放相邻的三个高度
CGFloat top =.0f;
for (NSUInteger idx =0; idx <
self.columnCount; idx++) {
[_colArraddObject:[NSNumbernumberWithFloat:top]];
}
//追加头文件布局.
NSArray *attributesArray1 = [superlayoutAttributesForElementsInRect:CGRectMake(0,0,self.collectionView.frame.size.width,self.collectionView.frame.size.height)];
for (UICollectionViewLayoutAttributes *headAttributesin attributesArray1)
{
if (headAttributes.representedElementKind ==UICollectionElementKindSectionHeader)
{
[self.layoutAttributesArrayaddObject:headAttributes];
}
}
// 遍历所有的item，重新布局
for (NSUInteger idx =0; idx < itemCount; idx++) {
[selflayoutItemAtIndexPath:[NSIndexPathindexPathForItem:idx
inSection:0]];
}
}
//
- (void)layoutItemAtIndexPath:(NSIndexPath *)indexPath {
// 获取collectionView的edgeInsets
UIEdgeInsets edgeInsets =self.sectionInset;
if ([self.delegaterespondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)])
{
edgeInsets = [self.delegatecollectionView:self.collectionViewlayout:selfinsetForSectionAtIndex:indexPath.row];
}
self.edgeInsets = edgeInsets;
// 获取collectionView的itemSize
CGSize itemSize =self.itemSize;
if ([self.delegaterespondsToSelector:@selector(collectionView:layout:sizeForItemAtIndexPath:)])
{
itemSize = [self.delegatecollectionView:self.collectionViewlayout:selfsizeForItemAtIndexPath:indexPath];
}
// 遍历相邻三个高度获取最小高度
NSUInteger col =0;
CGFloat shortHeight = [[_colArrfirstObject]
floatValue];
for (NSUInteger idx =0; idx <
_colArr.count; idx++) {
CGFloat height = [_colArr[idx]floatValue];
if (height < shortHeight) {
shortHeight = height;
col = idx;
}
}
// 得到最小高度的当前Y坐标起始高度
float top = [[_colArrobjectAtIndex:col]
floatValue];
//追加头文件布局.
CGFloat headLastY =0;
NSArray *attributesArray1 = [superlayoutAttributesForElementsInRect:CGRectMake(0,0,self.collectionView.frame.size.width,self.collectionView.frame.size.height)];
for (UICollectionViewLayoutAttributes *headAttributesin attributesArray1)
{
if (headAttributes.representedElementKind ==UICollectionElementKindSectionHeader)
{
headLastY = headAttributes.frame.size.height;
}
}
top = top < headLastY?(top+headLastY):top;
// 设置当前cell的frame
CGRect frame =CGRectMake(edgeInsets.left + col * (edgeInsets.left
+ itemSize.width), top + edgeInsets.top, itemSize.width, itemSize.height);
// 把对应的indexPath存放到字典中保存
[_attributessetObject:indexPath
forKey:NSStringFromCGRect(frame)];
UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributeslayoutAttributesForCellWithIndexPath:indexPath];
attributes.frame = frame;
[self.layoutAttributesArrayaddObject:attributes];
// 跟新colArr数组中的高度
[_colArrreplaceObjectAtIndex:colwithObject:[NSNumbernumberWithFloat:top
+ edgeInsets.top + itemSize.height]];
}
// 系统方法，获取当前可视界面显示的UICollectionViewLayoutAttributes数组
- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect {
returnself.layoutAttributesArray;
}
// 更新对应UICollectionViewLayoutAttributes的frame
- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributeslayoutAttributesForCellWithIndexPath:indexPath];
for (NSString *framein
_attributes) {
if (_attributes[frame] == indexPath) {
attributes.frame =CGRectFromString(frame);
}
}
return attributes;
}
- (CGSize)collectionViewContentSize {
CGSize size =self.collectionView.frame.size;
CGFloat maxHeight = [[_colArrfirstObject]
floatValue];
//查找最高的列的高度
for (NSUInteger idx =0; idx <
_colArr.count; idx++) {
CGFloat colHeight = [_colArr[idx]floatValue];
if (colHeight > maxHeight) {
maxHeight = colHeight;
}
}
size.height = maxHeight +self.edgeInsets.bottom;
return size;
}
5.使用。
//列表集合
SWVideoCollectionView *videoView = [[SWVideoCollectionViewalloc]
initWithFrame:self.boundsheaderReferenceSize:CGSizeZeroheadClass:nil];
videoView.delegate =self;
self.videoView = videoView;
videoView.tag =self.tag;
self.collectionView = videoView.collectionView;
[self.collectionViewaddHeaderWithTarget:selfaction:@selector(getUp:)];
[self.collectionViewaddFooterWithTarget:selfaction:@selector(getDown:)];
[selfaddSubview:videoView];
//首页集合
SWVideoCollectionView *mainVideoView = [[SWVideoCollectionViewalloc]
initWithFrame:self.boundsheaderReferenceSize:CGSizeMake(frame.size.width,
frame.size.width *0.65 +
30)headClass:@"SWHeadScrollViewCell"];
mainVideoView.delegate =self;
self.mainVideoView = mainVideoView;
mainVideoView.tag =self.tag;
self.collectionViewMain = mainVideoView.collectionView;
[self.collectionViewMainaddHeaderWithTarget:selfaction:@selector(getUp:)];
[self.collectionViewMainaddFooterWithTarget:selfaction:@selector(getDown:)];
[selfaddSubview:mainVideoView];
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