首先在pageFlow.h中定义
#import <UIKit/UIKit.h>
@protocol PagedFlowViewDataSource;
@protocol PagedFlowViewDelegate;
typedef enum{
PagedFlowViewOrientationHorizontal = 0,
PagedFlowViewOrientationVertical
}PagedFlowViewOrientation;
typedef enum{ PagedFlowViewOrientationHorizontal = 0, PagedFlowViewOrientationVertical
}PagedFlowViewOrientation;
@interface PageFlow : UIView<UIScrollViewDelegate>{
PagedFlowViewOrientation orientation;//默认为横向
UIScrollView *_scrollView;
BOOL _needsReload;
CGSize _pageSize; //一页的尺寸
NSInteger _pageCount; //总页数
NSInteger _currentPageIndex;
NSMutableArray *_cells;
NSRange _visibleRange;
NSMutableArray *_reusableCells;//如果以后需要支持reuseIdentifier，这边就得使用字典类型了 UIPageControl *pageControl; //可以是自己自定义的PageControl
//如果希望非当前页的大小或者透明度发生变化可以设置这两个值
CGFloat _minimumPageAlpha;
CGFloat _minimumPageScale;
}
@property(nonatomic,assign) iddataSource;
@property(nonatomic,assign) iddelegate;
@property(nonatomic,retain) UIPageControl *pageControl;
@property (nonatomic, assign) CGFloat minimumPageAlpha;
@property (nonatomic, assign) CGFloat minimumPageScale;
@property (nonatomic, assign) PagedFlowViewOrientation orientation;
@property (nonatomic, assign, readonly) NSInteger currentPageIndex;
- (void)reloadData;//获取可重复使用的Cell
- (UIView *)dequeueReusableCell;
- (void)scrollToPage:(NSUInteger)pageNumber;
@end@protocol PagedFlowViewDelegate
- (CGSize)sizeForPageInFlowView:(PageFlow *)flowView;
@optional
- (void)didScrollToPage:(NSInteger)pageNumber inFlowView:(PageFlow *)flowView;
@end
@protocol PagedFlowViewDataSource//返回显示View的个数
- (NSInteger)numberOfPagesInFlowView:(PageFlow *)flowView;
//返回给某列使用的View
- (UIView *)flowView:(PageFlow *)flowView cellForPageAtIndex:(NSInteger)index;
@end
在.m文件中需要填写
#import "PageFlow.h"
@interface PageFlow()
@property (nonatomic, assign, readwrite) NSInteger currentPageIndex;
@end
@implementation PageFlow
@synthesize pageControl;
@synthesize minimumPageAlpha = _minimumPageAlpha;
@synthesize minimumPageScale = _minimumPageScale;
@synthesize orientation;
@synthesize currentPageIndex = _currentPageIndex;
////////////////////////////////////////////////////////////////////////////////////////////////////
#pragma mark -
#pragma mark Private Methods
- (void)initialize{
self.clipsToBounds = YES;
_needsReload = YES;
_pageSize = self.bounds.size;
_pageCount = 0;
_currentPageIndex = 0;
_minimumPageAlpha = 1.0;
_minimumPageScale = 1.0;
_visibleRange = NSMakeRange(0, 0);
_reusableCells = [[NSMutableArray alloc] initWithCapacity:0];
_cells = [[NSMutableArray alloc] initWithCapacity:0];
_scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
_scrollView.delegate = self;
_scrollView.pagingEnabled = YES;
_scrollView.clipsToBounds = NO;
_scrollView.showsHorizontalScrollIndicator = NO;
_scrollView.showsVerticalScrollIndicator = NO;
/*由于UIScrollView在滚动之后会调用自己的layoutSubviews以及父View的layoutSubviews
这里为了避免scrollview滚动带来自己layoutSubviews的调用,所以给scrollView加了一层父View
*/
UIView *superViewOfScrollView = [[UIView alloc] initWithFrame:self.bounds];
[superViewOfScrollView setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
[superViewOfScrollView setBackgroundColor:[UIColor clearColor]];
[superViewOfScrollView addSubview:_scrollView];
[self addSubview:superViewOfScrollView];
}
- (void)queueReusableCell:(UIView *)cell{
[_reusableCells addObject:cell];
}
- (void)removeCellAtIndex:(NSInteger)index{
UIView *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 && _minimumPageScale == 1.0) {
return;//无需更新
}
switch (orientation) {
case PagedFlowViewOrientationHorizontal:{
CGFloat offset = _scrollView.contentOffset.x;
for (NSInteger i = _visibleRange.location; i < _visibleRange.location + _visibleRange.length; i++) {
UIView *cell = [_cells objectAtIndex:i];
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
[UIView beginAnimations:@"CellAnimation" context:nil];
if (delta < _pageSize.width) {
cell.alpha = 1 - (delta / _pageSize.width) * (1 - _minimumPageAlpha);
CGFloat inset = (_pageSize.width * (1 - _minimumPageScale)) * (delta / _pageSize.width)/2.0;
cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(inset, inset, inset, inset));
} else {
cell.alpha = _minimumPageAlpha;
CGFloat inset = _pageSize.width * (1 - _minimumPageScale) / 2.0 ;
cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(inset, inset, inset, inset));
}
[UIView commitAnimations];
}
break;
}
case PagedFlowViewOrientationVertical:{
CGFloat offset = _scrollView.contentOffset.y;
for (NSInteger i = _visibleRange.location; i < _visibleRange.location + _visibleRange.length; i++) {
UIView *cell = [_cells objectAtIndex:i];
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
[UIView beginAnimations:@"CellAnimation" context:nil];
if (delta < _pageSize.height) {
cell.alpha = 1 - (delta / _pageSize.height) * (1 - _minimumPageAlpha);
CGFloat inset = (_pageSize.height * (1 - _minimumPageScale)) * (delta / _pageSize.height)/2.0;
cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(inset, inset, inset, inset));
} else {
cell.alpha = _minimumPageAlpha;
CGFloat inset = _pageSize.height * (1 - _minimumPageScale) / 2.0 ;
cell.frame = UIEdgeInsetsInsetRect(originCellFrame, UIEdgeInsetsMake(inset, inset, inset, inset));
}
[UIView commitAnimations];
}
}
default:
break;
}
}
- (void)setPageAtIndex:(NSInteger)pageIndex{
NSParameterAssert(pageIndex >= 0 && pageIndex < [_cells count]);
UIView *cell = [_cells objectAtIndex:pageIndex];
if ((NSObject *)cell == [NSNull null]) {
cell = [_dataSource flowView:self cellForPageAtIndex:pageIndex];
NSAssert(cell!=nil, @"datasource must not return nil");
[_cells replaceObjectAtIndex:pageIndex withObject:cell];
switch (orientation) {
case PagedFlowViewOrientationHorizontal:
cell.frame = CGRectMake(_pageSize.width * pageIndex, 0, _pageSize.width, _pageSize.height);
break;
case PagedFlowViewOrientationVertical:
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 (orientation) {
case PagedFlowViewOrientationHorizontal:{
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);
_visibleRange.location = startIndex;
_visibleRange.length = 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 PagedFlowViewOrientationVertical:{
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 (int 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;
}
- (void)layoutSubviews{
[super layoutSubviews];
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:)]) {
_pageCount = [_dataSource numberOfPagesInFlowView:self];
if (pageControl && [pageControl respondsToSelector:@selector(setNumberOfPages:)]) {
[pageControl setNumberOfPages:_pageCount];
}
}
//重置pageWidth
if (_delegate && [_delegate respondsToSelector:@selector(sizeForPageInFlowView:)]) {
_pageSize = [_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 (orientation) {
case PagedFlowViewOrientationHorizontal://横向
_scrollView.frame = CGRectMake(0, 0, _pageSize.width, _pageSize.height);
_scrollView.contentSize = CGSizeMake(_pageSize.width * _pageCount,_pageSize.height);
CGPoint theCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
_scrollView.center = theCenter;
break;
case PagedFlowViewOrientationVertical:{
_scrollView.frame = CGRectMake(0, 0, _pageSize.width, _pageSize.height);
_scrollView.contentSize = CGSizeMake(_pageSize.width ,_pageSize.height * _pageCount);
CGPoint theCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
_scrollView.center = theCenter;
break;
}
default:
break;
}
}
[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
}
////////////////////////////////////////////////////////////////////////////////////////////////////
#pragma mark -
#pragma mark PagedFlowView API
- (void)reloadData
{
_needsReload = YES;
[self setNeedsLayout];
}
- (UIView *)dequeueReusableCell{
UIView *cell = [_reusableCells lastObject];
if (cell)
{
[_reusableCells removeLastObject];
}
return cell;
}
- (void)scrollToPage:(NSUInteger)pageNumber {
if (pageNumber < _pageCount) {
switch (orientation) {
case PagedFlowViewOrientationHorizontal:
[_scrollView setContentOffset:CGPointMake(_pageSize.width * pageNumber, 0) animated:YES];
break;
case PagedFlowViewOrientationVertical:
[_scrollView setContentOffset:CGPointMake(0, _pageSize.height * pageNumber) 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{
[self setPagesAtContentOffset:scrollView.contentOffset];
[self refreshVisibleCellAppearance];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
//如果有PageControl，计算出当前页码，并对pageControl进行更新
NSInteger pageIndex;
switch (orientation) {
case PagedFlowViewOrientationHorizontal:
pageIndex = floor(_scrollView.contentOffset.x / _pageSize.width);
break;
case PagedFlowViewOrientationVertical:
pageIndex = floor(_scrollView.contentOffset.y / _pageSize.height);
break;
default:
break;
}
if (pageControl && [pageControl respondsToSelector:@selector(setCurrentPage:)]) {
[pageControl setCurrentPage:pageIndex];
}
if ([_delegate respondsToSelector:@selector(didScrollToPage:inFlowView:)] && _currentPageIndex != pageIndex) {
[_delegate didScrollToPage:pageIndex inFlowView:self];
}
_currentPageIndex = pageIndex;
}
@end
在需要使用的viewCOntroller.h中设置
#import "PageFlow.h"
@interface ViewController : UIViewController
@property (strong, nonatomic) IBOutlet UIPageControl *pageControl;
@property (strong, nonatomic) IBOutlet PageFlow *hFlowView;
@property (strong, nonatomic) IBOutlet PageFlow *vFlowView;
- (IBAction)pageControlValueChange:(id)sender;
@end
在.m文件中设置相应的修改：
#import@interface ViewController (){
NSArray *imageArray;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
imageArray=[[NSArray alloc]initWithObjects:@"0.tiff",@"1.tiff",@"2.tiff",@"3.tiff",@"4.tiff",@"5.tiff",@"6.tiff",@"7.tiff", nil];
_hFlowView.delegate=self;
_hFlowView.dataSource=self;
_hFlowView.pageControl=_pageControl;
_hFlowView.minimumPageAlpha=0.3;
_hFlowView.minimumPageScale=0.9;
_vFlowView.delegate=self;
_vFlowView.dataSource=self;
_vFlowView.minimumPageScale=0.8;
_vFlowView.minimumPageAlpha=0.4;
_vFlowView.orientation=PagedFlowViewOrientationVertical;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
-(CGSize)sizeForPageInFlowView:(PageFlow *)flowView{
return CGSizeMake(200, 150);
}
-(NSInteger)numberOfPagesInFlowView:(PageFlow *)flowView{
return [imageArray count];
}
-(UIView *)flowView:(PageFlow *)flowView cellForPageAtIndex:(NSInteger)index{
UIImageView *imageView=(UIImageView *)[flowView dequeueReusableCell];
if (!imageView) {
imageView=[[UIImageView alloc]init];
imageView.layer.cornerRadius=6;
imageView.layer.masksToBounds=YES;
}
imageView.image=[UIImage imageNamed:[imageArray objectAtIndex:index]];
return imageView;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)pageControlValueChange:(id)sender {
UIPageControl *pageControl=sender;
[_hFlowView scrollToPage:pageControl.currentPage];
[_vFlowView scrollToPage:pageControl.currentPage];
}
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