#import "CSScrollview.h"

@interface CSScrollview () <UICollectionViewDelegate, UICollectionViewDataSource>

@property (nonatomic, strong) UICollectionView* listView;

@property (nonatomic, strong) UIPageControl* pageControl;

@property (nonatomic, strong) NSTimer* timer;

@implementation CSScrollview

- (instancetype)initWithFrame:(CGRect)frame layout:(UICollectionViewFlowLayout*)layout

{

self = [super initWithFrame:frame];

if (self) {

_listView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height) collectionViewLayout:layout];

_listView.delegate = self;

_listView.dataSource = self;

_listView.backgroundColor = [UIColor clearColor];

_listView.showsHorizontalScrollIndicator = NO;

_listView.showsVerticalScrollIndicator = NO;

_listView.pagingEnabled = YES;

[_listView registerClass:[CSScrollUnit class] forCellWithReuseIdentifier:@"CSScrollUnit"];

[self addSubview:_listView];

_pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, frame.size.height - 20, frame.size.width, 20)];

_pageControl.currentPageIndicatorTintColor = [UIColor redColor];

_pageControl.pageIndicatorTintColor = [UIColor greenColor];

[self addSubview:_pageControl];

}

return self;

}

- (void)update:(NSArray*)datas

{

if (datas.count > 0) {

_items = [NSArray arrayWithArray:datas];

[_listView reloadData];

_pageControl.currentPage = 0;

_pageControl.numberOfPages = _items.count;

CGSize size= [_pageControl sizeForNumberOfPages:_items.count];

_pageControl.size = CGSizeMake(size.width, 20);

_pageControl.bottom = self.height;

_pageControl.centerX = self.width/2;

if (self.autoScrollEnable) {

[self beginAutoScroll];

}

}

}

- (void)setShowPageControl:(BOOL)showPageControl

{

self.pageControl.hidden = !showPageControl;

}

#pragma mark - autoscroll

- (void)beginAutoScroll

{

if (!_autoScrollEnable) {

return;

}

if (_timer) {

[_timer invalidate];

_timer = nil;

}

_timer = [NSTimer scheduledTimerWithTimeInterval:CSScrollTime target:self selector:@selector(didAutoScroll) userInfo:nil repeats:YES];

[_timer fire];

}

- (void)didAutoScroll

{

if (!_items || _items.count == 0) {

return;

}

NSInteger curIndex = _pageControl.currentPage;

NSInteger willIndex = (curIndex + 1) % _pageControl.numberOfPages;

NSIndexPath* path = [NSIndexPath indexPathForRow:willIndex inSection:0];

[_listView scrollToItemAtIndexPath:path atScrollPosition:UICollectionViewScrollPositionRight animated:YES];

_pageControl.currentPage = willIndex;

// [self beginAutoScroll];

}

#pragma mark -

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

{

if (_tapBlk) {

_tapBlk(_items[indexPath.row]);

}

}

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

{

return _items.count;

}

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

{

CSScrollUnit* unit = [collectionView dequeueReusableCellWithReuseIdentifier:@"CSScrollUnit" forIndexPath:indexPath];

unit.refIteml = _items[indexPath.row];

return unit;

}

- (void)scrollViewDidEndDecelerating:(UIScrollView*)scrollView

{

//更新UIPageControl的当前页

CGPoint offset = scrollView.contentOffset;

CGRect bounds = scrollView.frame;

[_pageControl setCurrentPage:offset.x / bounds.size.width];

if (!_autoScrollEnable) {

return;

}

NSArray* visiblelist = self.listView.visibleCells;

if (visiblelist.count == 1) {

UICollectionViewCell* visibleCell = visiblelist.lastObject;

NSIndexPath* curIndexPath = [self.listView indexPathForCell:visibleCell];

_pageControl.currentPage = curIndexPath.row;

}

}

@implementation CSScrollItem

+ (instancetype)itemWithData:(id)data imgUrl:(NSString*)imgUrl

{

CSScrollItem* item = [[CSScrollItem alloc] init];

item.data = data;

item.imgUrl = imgUrl;

return item;

}

@implementation CSScrollUnit {

UIImageView* _imgView;

}

- (void)setRefIteml:(CSScrollItem*)refIteml

{

if (!_imgView) {

_imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.width, self.height)];

_imgView.backgroundColor = kColorTableBG;

[self.contentView addSubview:_imgView];

}

[_imgView sd_setImageWithURL:[NSURL URLWithString:refIteml.imgUrl]];

}