iOS 卡片轮播图

个人学习记录。参考文章：https://github.com/PageGuo/NewPagedFlowView

IMG_2762.GIF

直接贴代码
NewPagedFlowView.h文件

#import <UIKit/UIKit.h>
#import "PGIndexBannerSubiew.h"
@protocol NewPagedFlowViewDataSource;
@protocol NewPagedFlowViewDelegate;

typedef enum{
NewPagedFlowViewOrientationHorizontal = 0,
NewPagedFlowViewOrientationVertical
}NewPagedFlowViewOrientation;

@interface NewPagedFlowView : UIView<UIScrollViewDelegate>

@property (nonatomic,assign) NewPagedFlowViewOrientation orientation;

@property (nonatomic, strong) UIScrollView *scrollView;

@property (nonatomic,assign) BOOL needsReload;
@property (nonatomic,assign) NSInteger pageCount;

@property (nonatomic,strong) NSMutableArray *cells;
@property (nonatomic,assign) NSRange visibleRange;

@property (nonatomic,strong) NSMutableArray *reusableCells;

 @property (nonatomic,assign)   id <NewPagedFlowViewDataSource> dataSource;
@property (nonatomic,assign)   id <NewPagedFlowViewDelegate>   delegate;

 @property (nonatomic,retain)  UIPageControl *pageControl;


@property (nonatomic, assign) CGFloat minimumPageAlpha;


@property (nonatomic, assign) CGFloat leftRightMargin;


 @property (nonatomic, assign) CGFloat topBottomMargin;


@property (nonatomic, assign) BOOL isOpenAutoScroll;


@property (nonatomic, assign) BOOL isCarousel;


@property (nonatomic, assign, readonly) NSInteger currentPageIndex;


@property (nonatomic, weak) NSTimer *timer;


 @property (nonatomic, assign) CGFloat autoTime;


@property (nonatomic, assign) NSInteger orginPageCount;


- (void)reloadDataWithWidth:(NSInteger) index;;


- (PGIndexBannerSubiew *)dequeueReusableCell;


 - (void)scrollToPage:(NSUInteger)pageNumber;




  - (void)stopTimer;


  - (void)adjustCenterSubview;

  @end


 @protocol  NewPagedFlowViewDelegate<NSObject>

 @optional
 /**
  *  当前显示cell的Size(中间页显示大小)
 *
   *  @param flowView <#flowView description#>
*
  *  @return <#return value description#>
 */
 - (CGSize)sizeForPageInFlowView:(NewPagedFlowView *)flowView;


- (void)didScrollToPage:(NSInteger)pageNumber inFlowView:(NewPagedFlowView *)flowView;


- (void)didSelectCell:(PGIndexBannerSubiew *)subView withSubViewIndex:(NSInteger)subIndex;

@end


@protocol NewPagedFlowViewDataSource <NSObject>


 - (NSInteger)numberOfPagesInFlowView:(NewPagedFlowView *)flowView;


- (PGIndexBannerSubiew *)flowView:(NewPagedFlowView *)flowView cellForPageAtIndex:(NSInteger)index;

  @end

NewPagedFlowView.m文件

 #import "NewPagedFlowView.h"

@interface NewPagedFlowView ()

@property (nonatomic, assign, readwrite) NSInteger currentPageIndex;
@property (nonatomic, assign) NSInteger page;
@property (nonatomic,assign) CGSize pageSize;

@end

//子控制器的类名
static NSString *subviewClassName;

@implementation NewPagedFlowView
#pragma mark -
#pragma mark Private Methods
- (void)initialize{
self.clipsToBounds = YES;

self.needsReload = YES;
self.pageCount = 0;
self.isOpenAutoScroll = NO;
self.isCarousel = YES;
self.leftRightMargin = 20;
self.topBottomMargin = 30;
_currentPageIndex = 0;

_minimumPageAlpha = 1.0;
_autoTime = 5.0;

self.visibleRange = NSMakeRange(0, 0);

self.reusableCells = [[NSMutableArray alloc] initWithCapacity:0];
self.cells = [[NSMutableArray alloc] initWithCapacity:0];

self.scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
self.scrollView.scrollsToTop = NO;
self.scrollView.delegate = self;
self.scrollView.pagingEnabled = YES;
self.scrollView.clipsToBounds = NO;
self.scrollView.showsHorizontalScrollIndicator = NO;
self.scrollView.showsVerticalScrollIndicator = NO;

subviewClassName = @"PGIndexBannerSubiew";

[self addSubview:self.scrollView];

}

- (void)setLeftRightMargin:(CGFloat)leftRightMargin {
_leftRightMargin = leftRightMargin * 0.5;

}

- (void)setTopBottomMargin:(CGFloat)topBottomMargin {
_topBottomMargin = topBottomMargin * 0.5;
}

- (void)startTimer {

if (self.orginPageCount > 1 && self.isOpenAutoScroll && self.isCarousel) {
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:self.autoTime target:self selector:@selector(autoNextPage) userInfo:nil repeats:YES];
    self.timer = timer;
    [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

}

}

- (void)stopTimer {

if (self.timer) {
    [self.timer invalidate];
    self.timer = nil;
}
  }

- (void)adjustCenterSubview {
if (self.isOpenAutoScroll && self.orginPageCount > 0) {
    [_scrollView setContentOffset:CGPointMake(_pageSize.width * self.page, 0) animated:NO];
}
 }

 #pragma mark --自动轮播
  - (void)autoNextPage {

self.page ++;



switch (self.orientation) {
    case NewPagedFlowViewOrientationHorizontal:{
        
        [_scrollView setContentOffset:CGPointMake(self.page * _pageSize.width, 0) animated:YES];
        break;
    }
    case NewPagedFlowViewOrientationVertical:{
        
        [_scrollView setContentOffset:CGPointMake(0, self.page * _pageSize.height) animated:YES];
        
        break;
    }
    default:
        break;
}
}


- (void)queueReusableCell:(PGIndexBannerSubiew *)cell{
[_reusableCells addObject:cell];
}

- (void)removeCellAtIndex:(NSInteger)index{
PGIndexBannerSubiew *cell = [_cells objectAtIndex:index];
if ((NSObject *)cell == [NSNull null]) {
    return;
}

[self queueReusableCell:cell];

if (cell.superview) {
    [cell removeFromSuperview];
}

[_cells replaceObjectAtIndex:index withObject:[NSNull null]];
}

  - (void)refreshVisibleCellAppearance{

if (_minimumPageAlpha == 1.0 && self.leftRightMargin == 0 && self.topBottomMargin == 0) {
    return;//无需更新
}
switch (self.orientation) {
    case NewPagedFlowViewOrientationHorizontal:{
        CGFloat offset = _scrollView.contentOffset.x;
        
        for (NSInteger i = self.visibleRange.location; i < self.visibleRange.location + _visibleRange.length; i++) {
            PGIndexBannerSubiew *cell = [_cells objectAtIndex:i];
            subviewClassName = NSStringFromClass([cell class]);
            CGFloat origin = cell.frame.origin.x;
            CGFloat delta = fabs(origin - offset);
            
            CGRect originCellFrame = CGRectMake(_pageSize.width * i, 0, _pageSize.width, _pageSize.height);//如果没有缩小效果的情况下的本该的Frame
            
            if (delta < _pageSize.width) {
                
                cell.coverView.alpha = (delta / _pageSize.width) * _minimumPageAlpha;
                
                CGFloat leftRightInset = self.leftRightMargin * delta / _pageSize.width;
                CGFloat topBottomInset = self.topBottomMargin * delta / _pageSize.width;
                
                cell.layer.transform = CATransform3DMakeScale((_pageSize.width-leftRightInset*2)/_pageSize.width,(_pageSize.height-topBottomInset*2)/_pageSize.height, 1.0);
                cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(topBottomInset, leftRightInset, topBottomInset, leftRightInset));

                
            } else {
                cell.coverView.alpha = _minimumPageAlpha;
                cell.layer.transform = CATransform3DMakeScale((_pageSize.width-self.leftRightMargin*2)/_pageSize.width,(_pageSize.height-self.topBottomMargin*2)/_pageSize.height, 1.0);
                cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(self.topBottomMargin, self.leftRightMargin, self.topBottomMargin, self.leftRightMargin));

                
            }

        }
        break;
    }
    case NewPagedFlowViewOrientationVertical:{
        CGFloat offset = _scrollView.contentOffset.y;
        
        for (NSInteger i = self.visibleRange.location; i < self.visibleRange.location + _visibleRange.length; i++) {
            PGIndexBannerSubiew *cell = [_cells objectAtIndex:i];
            subviewClassName = NSStringFromClass([cell class]);
            CGFloat origin = cell.frame.origin.y;
            CGFloat delta = fabs(origin - offset);
            
            CGRect originCellFrame = CGRectMake(0, _pageSize.height * i, _pageSize.width, _pageSize.height);//如果没有缩小效果的情况下的本该的Frame
            
            if (delta < _pageSize.height) {
                cell.coverView.alpha = (delta / _pageSize.height) * _minimumPageAlpha;
                
                CGFloat leftRightInset = self.leftRightMargin * delta / _pageSize.height;
                CGFloat topBottomInset = self.topBottomMargin * delta / _pageSize.height;
                
                cell.layer.transform = CATransform3DMakeScale((_pageSize.width-leftRightInset*2)/_pageSize.width,(_pageSize.height-topBottomInset*2) / _pageSize.height, 1.0);
                cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(topBottomInset, leftRightInset, topBottomInset, leftRightInset));
                cell.mainImageView.frame = cell.bounds;
            } else {
                cell.coverView.alpha = _minimumPageAlpha;
                cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(self.topBottomMargin, self.leftRightMargin, self.topBottomMargin, self.leftRightMargin));
                cell.mainImageView.frame = cell.bounds;
            }

        }
    }
    default:
        break;
}

}

  - (void)setPageAtIndex:(NSInteger)pageIndex{
NSParameterAssert(pageIndex >= 0 && pageIndex < [_cells count]);

PGIndexBannerSubiew *cell = [_cells objectAtIndex:pageIndex];

if ((NSObject *)cell == [NSNull null]) {
    cell = [_dataSource flowView:self cellForPageAtIndex:pageIndex % self.orginPageCount];
    NSAssert(cell!=nil, @"datasource must not return nil");
    [_cells replaceObjectAtIndex:pageIndex withObject:cell];
    
    cell.tag = pageIndex % self.orginPageCount;
    [cell setSubviewsWithSuperViewBounds:CGRectMake(0, 0, _pageSize.width, _pageSize.height)];
    
    __weak __typeof(self) weakSelf = self;
    cell.didSelectCellBlock = ^(NSInteger tag, PGIndexBannerSubiew *cell) {
        [weakSelf singleCellTapAction:tag withCell:cell];
    };
    
    switch (self.orientation) {
        case NewPagedFlowViewOrientationHorizontal:
            cell.frame = CGRectMake(_pageSize.width * pageIndex, 0, _pageSize.width, _pageSize.height);
            break;
        case NewPagedFlowViewOrientationVertical:
            cell.frame = CGRectMake(0, _pageSize.height * pageIndex, _pageSize.width, _pageSize.height);
            break;
        default:
            break;
    }
    
    if (!cell.superview) {
        [_scrollView addSubview:cell];
    }
}
 }


  - (void)setPagesAtContentOffset:(CGPoint)offset{
//计算_visibleRange
CGPoint startPoint = CGPointMake(offset.x - _scrollView.frame.origin.x, offset.y - _scrollView.frame.origin.y);
CGPoint endPoint = CGPointMake(startPoint.x + self.bounds.size.width, startPoint.y + self.bounds.size.height);


switch (self.orientation) {
    case NewPagedFlowViewOrientationHorizontal:{
        NSInteger startIndex = 0;
        for (int i =0; i < [_cells count]; i++) {
            if (_pageSize.width * (i +1) > startPoint.x) {
                startIndex = I;
                break;
            }
        }
        
        NSInteger endIndex = startIndex;
        for (NSInteger i = startIndex; i < [_cells count]; i++) {
            //如果都不超过则取最后一个
            if ((_pageSize.width * (i + 1) < endPoint.x && _pageSize.width * (i + 2) >= endPoint.x) || i+ 2 == [_cells count]) {
                endIndex = i + 1;//i+2 是以个数，所以其index需要减去1
                break;
            }
        }
        
        //可见页分别向前向后扩展一个，提高效率
        startIndex = MAX(startIndex - 1, 0);
        endIndex = MIN(endIndex + 1, [_cells count] - 1);
        
        //            self.visibleRange.location = startIndex;
        //            self.visibleRange.length = endIndex - startIndex + 1;
        self.visibleRange = NSMakeRange(startIndex, endIndex - startIndex + 1);
        for (NSInteger i = startIndex; i <= endIndex; i++) {
            [self setPageAtIndex:i];
        }
        
        for (int i = 0; i < startIndex; i ++) {
            [self removeCellAtIndex:i];
        }
        
        for (NSInteger i = endIndex + 1; i < [_cells count]; i ++) {
            [self removeCellAtIndex:i];
        }
        break;
    }
    case NewPagedFlowViewOrientationVertical:{
        NSInteger startIndex = 0;
        for (int i =0; i < [_cells count]; i++) {
            if (_pageSize.height * (i +1) > startPoint.y) {
                startIndex = I;
                break;
            }
        }
        
        NSInteger endIndex = startIndex;
        for (NSInteger i = startIndex; i < [_cells count]; i++) {
            //如果都不超过则取最后一个
            if ((_pageSize.height * (i + 1) < endPoint.y && _pageSize.height * (i + 2) >= endPoint.y) || i+ 2 == [_cells count]) {
                endIndex = i + 1;//i+2 是以个数，所以其index需要减去1
                break;
            }
        }
        
        //可见页分别向前向后扩展一个，提高效率
        startIndex = MAX(startIndex - 1, 0);
        endIndex = MIN(endIndex + 1, [_cells count] - 1);
        
        _visibleRange.location = startIndex;
        _visibleRange.length = endIndex - startIndex + 1;
        
        for (NSInteger i = startIndex; i <= endIndex; i++) {
            [self setPageAtIndex:i];
        }
        
        for (NSInteger i = 0; i < startIndex; i ++) {
            [self removeCellAtIndex:i];
        }
        
        for (NSInteger i = endIndex + 1; i < [_cells count]; i ++) {
            [self removeCellAtIndex:i];
        }
        break;
    }
    default:
        break;
}



}




  ////////////////////////////////////////////////////////////////////////////////////////////////////
  #pragma mark -
 #pragma mark Override Methods

  - (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self)
{
    [self initialize];
}
return self;
}

 - (id)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
if (self)
{
    [self initialize];
}
return self;
}


////////////////////////////////////////////////////////////////////////////////////////////////////
  #pragma mark -
 #pragma mark NewPagedFlowView API

- (void)reloadDataWithWidth:(NSInteger)index {
_needsReload = YES;

//移除所有self.scrollView的子控件
for (UIView *view in self.scrollView.subviews) {
    if ([NSStringFromClass(view.class) isEqualToString:subviewClassName] || [view isKindOfClass:[PGIndexBannerSubiew class]]) {
        [view removeFromSuperview];
    }
}

[self stopTimer];

if (_needsReload) {
    //如果需要重新加载数据，则需要清空相关数据全部重新加载
    
    
    //重置pageCount
    if (_dataSource && [_dataSource respondsToSelector:@selector(numberOfPagesInFlowView:)]) {
        
        //原始页数
        self.orginPageCount = [_dataSource numberOfPagesInFlowView:self];
        
        //总页数
        if (self.isCarousel) {
            _pageCount = self.orginPageCount == 1 ? 1: [_dataSource numberOfPagesInFlowView:self] * 3;
        }else {
            _pageCount = self.orginPageCount == 1 ? 1: [_dataSource numberOfPagesInFlowView:self];
        }
        
        //如果总页数为0，return
        if (_pageCount == 0) {
            
            return;
        }
        
        if (self.pageControl && [self.pageControl respondsToSelector:@selector(setNumberOfPages:)]) {
            [self.pageControl setNumberOfPages:self.orginPageCount];
        }
    }
    
    //重置pageWidth
    _pageSize = CGSizeMake(self.bounds.size.width - 4 * self.leftRightMargin,(self.bounds.size.width - 4 * self.leftRightMargin) * 9 /16);
    if (self.delegate && self.delegate && [self.delegate respondsToSelector:@selector(sizeForPageInFlowView:)]) {
        _pageSize = [self.delegate sizeForPageInFlowView:self];
    }
    
    [_reusableCells removeAllObjects];
    _visibleRange = NSMakeRange(0, 0);
    
    //填充cells数组
    [_cells removeAllObjects];
    for (NSInteger index=0; index<_pageCount; index++)
    {
        [_cells addObject:[NSNull null]];
    }
    
    // 重置_scrollView的contentSize
    switch (self.orientation) {
        case NewPagedFlowViewOrientationHorizontal://横向
            _scrollView.frame = CGRectMake(0, 0, _pageSize.width, _pageSize.height);
            _scrollView.contentSize = CGSizeMake(_pageSize.width * _pageCount,0);
            CGPoint theCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
            _scrollView.center = theCenter;
            
            if (self.orginPageCount > 1) {
                
                if (self.isCarousel) {
                    
                    //滚到第二组
                    [_scrollView setContentOffset:CGPointMake(_pageSize.width * (self.orginPageCount+index), 0) animated:NO];
                    
                    self.page = self.orginPageCount;
                    
                    //启动自动轮播
                    [self startTimer];
                    
                }else {
                    //滚到开始
                    [_scrollView setContentOffset:CGPointMake(0, 0) animated:NO];
                    
                    self.page = self.orginPageCount;
                    
                }
                
            }
            
            break;
        case NewPagedFlowViewOrientationVertical:{
            _scrollView.frame = CGRectMake(0, 0, _pageSize.width, _pageSize.height);
            _scrollView.contentSize = CGSizeMake(0 ,_pageSize.height * _pageCount);
            CGPoint theCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
            _scrollView.center = theCenter;
            
            if (self.orginPageCount > 1) {
                
                if (self.isCarousel) {
                    //滚到第二组
                    [_scrollView setContentOffset:CGPointMake(0, _pageSize.height * self.orginPageCount) animated:NO];
                    
                    self.page = self.orginPageCount;
                    
                    //启动自动轮播
                    [self startTimer];
                }else {
                    //滚到第二组
                    [_scrollView setContentOffset:CGPointMake(0, 0) animated:NO];
                    
                    self.page = self.orginPageCount;
                    
                }
                
            }
            
            break;
        }
        default:
            break;
    }
    
    _needsReload = NO;
}

[self setPagesAtContentOffset:_scrollView.contentOffset];//根据当前scrollView的offset设置cell

[self refreshVisibleCellAppearance];//更新各个可见Cell的显示外貌
}


  - (PGIndexBannerSubiew *)dequeueReusableCell{
PGIndexBannerSubiew *cell = [_reusableCells lastObject];
if (cell)
{
    [_reusableCells removeLastObject];
}

return cell;
 }

  - (void)scrollToPage:(NSUInteger)pageNumber {
if (pageNumber < _pageCount) {
    
    //首先停止定时器
    [self stopTimer];
    
    if (self.isCarousel) {
        
        self.page = pageNumber + self.orginPageCount;
        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(startTimer) object:nil];
        [self performSelector:@selector(startTimer) withObject:nil afterDelay:0.5];
        
    }else {
        self.page = pageNumber;
    }
    
    switch (self.orientation) {
        case NewPagedFlowViewOrientationHorizontal:
            [_scrollView setContentOffset:CGPointMake(_pageSize.width * self.page, 0) animated:YES];
            break;
        case NewPagedFlowViewOrientationVertical:
            [_scrollView setContentOffset:CGPointMake(0, _pageSize.height * self.page) animated:YES];
            break;
    }
    [self setPagesAtContentOffset:_scrollView.contentOffset];
    [self refreshVisibleCellAppearance];
}
   }

  ////////////////////////////////////////////////////////////////////////////////////////////////////
   #pragma mark -
   #pragma mark hitTest

  - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
if ([self pointInside:point withEvent:event]) {
    CGPoint newPoint = CGPointZero;
    newPoint.x = point.x - _scrollView.frame.origin.x + _scrollView.contentOffset.x;
    newPoint.y = point.y - _scrollView.frame.origin.y + _scrollView.contentOffset.y;
    if ([_scrollView pointInside:newPoint withEvent:event]) {
        return [_scrollView hitTest:newPoint withEvent:event];
    }
    
    return _scrollView;
}

return nil;
}


  #pragma mark -
  #pragma mark UIScrollView Delegate

  - (void)scrollViewDidScroll:(UIScrollView *)scrollView{
  
if (self.orginPageCount == 0) {
    return;
}

NSInteger pageIndex;

switch (self.orientation) {
    case NewPagedFlowViewOrientationHorizontal:
        pageIndex = (int)round(_scrollView.contentOffset.x / _pageSize.width) % self.orginPageCount;
        break;
    case NewPagedFlowViewOrientationVertical:
        pageIndex = (int)round(_scrollView.contentOffset.y / _pageSize.height) % self.orginPageCount;
        break;
    default:
        break;
}

if (self.isCarousel) {
    
    if (self.orginPageCount > 1) {
        switch (self.orientation) {
            case NewPagedFlowViewOrientationHorizontal:
            {
                if (scrollView.contentOffset.x / _pageSize.width >= 2 * self.orginPageCount) {
                    
                    [scrollView setContentOffset:CGPointMake(_pageSize.width * self.orginPageCount, 0) animated:NO];
                    
                    self.page = self.orginPageCount;
                    
                }
                
                if (scrollView.contentOffset.x / _pageSize.width <= self.orginPageCount - 1) {
                    [scrollView setContentOffset:CGPointMake((2 * self.orginPageCount - 1) * _pageSize.width, 0) animated:NO];
                    
                    self.page = 2 * self.orginPageCount;
                }
                
            }
                break;
            case NewPagedFlowViewOrientationVertical:
            {
                if (scrollView.contentOffset.y / _pageSize.height >= 2 * self.orginPageCount) {
                    
                    [scrollView setContentOffset:CGPointMake(0, _pageSize.height * self.orginPageCount) animated:NO];
                    
                    self.page = self.orginPageCount;
                    
                }
                
                if (scrollView.contentOffset.y / _pageSize.height <= self.orginPageCount - 1) {
                    [scrollView setContentOffset:CGPointMake(0, (2 * self.orginPageCount - 1) * _pageSize.height) animated:NO];
                    self.page = 2 * self.orginPageCount;
                }
                
            }
                break;
            default:
                break;
        }
        
        
    }else {
        
        pageIndex = 0;
        
        
    }
}


[self setPagesAtContentOffset:scrollView.contentOffset];
[self refreshVisibleCellAppearance];

if (self.pageControl && [self.pageControl respondsToSelector:@selector(setCurrentPage:)]) {
    
    [self.pageControl setCurrentPage:pageIndex];
}

if (_delegate && [_delegate respondsToSelector:@selector(didScrollToPage:inFlowView:)] && _currentPageIndex != pageIndex && pageIndex >= 0) {
    [_delegate didScrollToPage:pageIndex inFlowView:self];
}

_currentPageIndex = pageIndex;
 }

  #pragma mark --将要开始拖拽
 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
[self stopTimer];
}

#pragma mark --结束拖拽
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
[self startTimer];
}

 #pragma mark --将要结束拖拽
 - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {

if (self.orginPageCount > 1 && self.isOpenAutoScroll && self.isCarousel) {
    
    switch (self.orientation) {
        case NewPagedFlowViewOrientationHorizontal:
        {
            if (self.page == floor(_scrollView.contentOffset.x / _pageSize.width)) {
                
                self.page = floor(_scrollView.contentOffset.x / _pageSize.width) + 1;
                
            }else {
                
                self.page = floor(_scrollView.contentOffset.x / _pageSize.width);
            }
        }
            break;
        case NewPagedFlowViewOrientationVertical:
        {
            if (self.page == floor(_scrollView.contentOffset.y / _pageSize.height)) {
                
                self.page = floor(_scrollView.contentOffset.y / _pageSize.height) + 1;
                
            }else {
                
                self.page = floor(_scrollView.contentOffset.y / _pageSize.height);
            }
        }
            break;
        default:
            break;
    }
    
}
}

 //点击了cell
 - (void)singleCellTapAction:(NSInteger)selectTag withCell:(PGIndexBannerSubiew *)cell {

if (self.delegate && [self.delegate respondsToSelector:@selector(didSelectCell:withSubViewIndex:)]) {
    
    [self.delegate didSelectCell:cell withSubViewIndex:selectTag];
    
}
 }

  //解决当父View释放时，当前视图因为被Timer强引用而不能释放的问题
 - (void)willMoveToSuperview:(UIView *)newSuperview {
if (!newSuperview) {
    [self stopTimer];
}
 }

  //解决当timer释放后 回调scrollViewDidScroll时访问野指针导致崩溃
 - (void)dealloc {
_scrollView.delegate = nil;
}

@end

PGIndexBannerSubiew.h 文件

#import <UIKit/UIKit.h>

@interface PGIndexBannerSubiew : UIView
@property (nonatomic, strong) UIImageView *mainImageView;
@property (nonatomic, strong) UIView *coverView;
@property (nonatomic, copy) void (^didSelectCellBlock)(NSInteger tag, PGIndexBannerSubiew *cell);
- (void)setSubviewsWithSuperViewBounds:(CGRect)superViewBounds;

@end

PGIndexBannerSubiew.m 文件

  #import "PGIndexBannerSubiew.h"

 @implementation PGIndexBannerSubiew

 - (instancetype)initWithFrame:(CGRect)frame {

self = [super initWithFrame:frame];

if (self) {
    
    [self addSubview:self.mainImageView];
    [self addSubview:self.coverView];
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleCellTapAction:)];
    [self addGestureRecognizer:singleTap];
}

return self;
 }

- (void)singleCellTapAction:(UIGestureRecognizer *)gesture {
if (self.didSelectCellBlock) {
    self.didSelectCellBlock(self.tag, self);
}
 }

 - (void)setSubviewsWithSuperViewBounds:(CGRect)superViewBounds {

if (CGRectEqualToRect(self.mainImageView.frame, superViewBounds)) {
    return;
}

self.mainImageView.frame = superViewBounds;
self.coverView.frame = superViewBounds;
 }

- (UIImageView *)mainImageView {

if (_mainImageView == nil) {
    _mainImageView = [[UIImageView alloc] init];
    _mainImageView.userInteractionEnabled = YES;
}
return _mainImageView;
 }

 - (UIView *)coverView {
if (_coverView == nil) {
    _coverView = [[UIView alloc] init];
    _coverView.backgroundColor = [UIColor blackColor];
}
return _coverView;
}

@end

调用实例：

 - (void)viewDidLoad {
     [super viewDidLoad];

     [self setJJQSubViews];
       //加载网络数据后刷新
      [self.pageFlowView reloadDataWithWidth:_selectIndex];
  }

 -(void)setJJQSubViews{
_selectIndex = 0;
[self.view addSubview:self.pageFlowView];
   self.pageFlowView.delegate = self;
   self.pageFlowView.dataSource = self;
   }
  -(NewPagedFlowView *)pageFlowView{
if (!_pageFlowView) {
 _pageFlowView = [[NewPagedFlowView alloc] initWithFrame:CGRectMake(0, KNavHeight+KScreenHeight/24, KScreenWidth, KScreenHeight-KNavHeight-KTabbarHeight-KScreenHeight/12)];
    _pageFlowView.minimumPageAlpha = 0.1;
    _pageFlowView.leftRightMargin = KScreenWidth/8-10;
    _pageFlowView.topBottomMargin = KScreenHeight/6;
}
return _pageFlowView;
  }
 #pragma mark NewPagedFlowView Delegate
- (CGSize)sizeForPageInFlowView:(NewPagedFlowView *)flowView {
return CGSizeMake(KScreenWidth*3/4, KScreenHeight-KNavHeight-KTabbarHeight-KScreenHeight/12);
}

  - (void)didSelectCell:(UIView *)subView withSubViewIndex:(NSInteger)subIndex {
_selectIndex = subIndex;
NSDictionary * dic = _quality_list[subIndex];
if([dic[@"unlock"] integerValue] == 1){
    if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"fire_tag"] integerValue] != 1){
        if([dic[@"mod_index"] integerValue] == 5){//跳dz
            OgmenaysController * vc = [[OgmenaysController alloc]initWithDataDic:dic];
            vc.hidesBottomBarWhenPushed = YES;
            [BaseNavigationController pushViewController:vc hiddenBottomWhenPush:YES animation:NO fromNavigation:self.navigationController];
            return;
        }
    }
    
    Astebaskets * vc = [[Astebaskets alloc]initWithDic:dic];
    vc.hidesBottomBarWhenPushed = YES;
    [self.navigationController pushViewController:vc animated:NO];
}else{
    
    if([Utils isVisitorLogin]){
        UidnuncsController * vc =[[UidnuncsController alloc]init];
        vc.hidesBottomBarWhenPushed = YES;
        vc.isFromFingerprintLogin = YES;
        [self.navigationController pushViewController:vc animated:YES];
        return;
    }
    
    _selectedDic = dic;
    
    self.unlockTipsAlert.str_content = [NSString stringWithFormat:@"打开%@板块需要消耗\n%@金币",dic[@"mod_name"],dic[@"unlock_gold"]];
    [[Njocoseness shareAppDelegate].window addSubview:self.unlockTipsAlert];
}


     }


#pragma mark NewPagedFlowView Datasource
 - (NSInteger)numberOfPagesInFlowView:(NewPagedFlowView *)flowView {

return _quality_list.count;

 }

 - (PGIndexBannerSubiew *)flowView:(NewPagedFlowView *)flowView cellForPageAtIndex:(NSInteger)index{
PGIndexBannerSubiew *bannerView = [flowView dequeueReusableCell];
if (!bannerView) {
    bannerView = [[PGIndexBannerSubiew alloc] init];
    bannerView.tag = index;
    bannerView.layer.cornerRadius = 20;
    bannerView.layer.masksToBounds = YES;
}
 NSDictionary * dic = _quality_list[index];
//在这里下载网络图片
  [bannerView.mainImageView sd_setImageWithURL:[NSURL URLWithString:dic[@"icon"]] placeholderImage:[UIImage imageNamed:@""]];


return bannerView;
 }


  ![IMG_2762.GIF](https://upload-images.jianshu.io/upload_images/3552412-f02b690dca78f705.GIF?imageMogr2/auto-orient/strip)
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