//
// CycleScrollView.h
// PagedScrollView
//
// Created by 李洪强 on 16-1-23.
// Copyright (c) 2016年 李洪强. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface CycleScrollView : UIView
@property (nonatomic , strong) NSTimer *animationTimer;
@property (nonatomic , readonly) UIScrollView *scrollView;
/**
* 初始化
*
* @param frame frame
* @param animationDuration 自动滚动的间隔时长。如果<=0，不自动滚动。
*
* @return instance
*/
- (id)initWithFrame:(CGRect)frame animationDuration:(NSTimeInterval)animationDuration;
- (void)pause;
- (void)restart;
/**
数据源：获取总的page个数
**/
@property (nonatomic ,copy) NSInteger (^totalPagesCount)(void);
/**
数据源：获取第pageIndex个位置的contentView
**/
@property (nonatomic , copy) UIView *(^fetchContentViewAtIndex)(NSInteger pageIndex);
/**
当点击的时候，执行的block
**/
@property (nonatomic , copy) void (^TapActionBlock)(NSInteger pageIndex);
@end
-------------------------------------------------------------------
//
// CycleScrollView.m
// PagedScrollView
//
// Created by 李洪强 on 16-1-23.
// Copyright (c) 2014年 李洪强. All rights reserved.
//
#import "CycleScrollView.h"
#import "NSTimer+Addition.h"
@interface CycleScrollView () <UIScrollViewDelegate>
{
BOOL onlyOnePage;
}
@property (nonatomic , assign) NSInteger currentPageIndex;
@property (nonatomic , assign) NSInteger totalPageCount;
@property (nonatomic , strong) NSMutableArray *contentViews;
@property (nonatomic , strong) UIScrollView *scrollView;
@property (nonatomic , assign) NSTimeInterval animationDuration;
@property (nonatomic,strong) UIPageControl *pageControl;
@end
@implementation CycleScrollView
- (void)dealloc{
[self.animationTimer invalidate];
self.animationTimer = nil;
}
- (void)setTotalPagesCount:(NSInteger (^)(void))totalPagesCount{
_totalPageCount = totalPagesCount();
_pageControl.numberOfPages = _totalPageCount;
if (_totalPageCount > 0) {
if (_totalPageCount > 1) {
[self startTimerWithRepeats:YES];
}
else{
self.animationDuration = 0.01;
onlyOnePage = YES;
[self startTimerWithRepeats:NO];
}
}
}
- (void)startTimerWithRepeats:(BOOL)repeats{
if (!self.animationTimer){
self.animationTimer = [NSTimer scheduledTimerWithTimeInterval:self.animationDuration
target:self
selector:@selector(animationTimerDidFired:)
userInfo:nil
repeats:repeats];
}
[self.animationTimer pauseTimer];
CGPoint newOffset = CGPointMake(self.scrollView.contentOffset.x + CGRectGetWidth(self.scrollView.frame), self.scrollView.contentOffset.y);
[self.scrollView setContentOffset:newOffset animated:repeats];
[self configContentViews];
[self.animationTimer resumeTimerAfterTimeInterval:self.animationDuration];
}
- (id)initWithFrame:(CGRect)frame animationDuration:(NSTimeInterval)animationDuration{
self = [self initWithFrame:frame];
if (animationDuration > 0.0) {
self.animationDuration = animationDuration;
}
return self;
}
- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.autoresizesSubviews = YES;
self.scrollView = [[UIScrollView alloc] initWithFrame:self.frame];
self.scrollView.showsHorizontalScrollIndicator = NO;
self.scrollView.autoresizingMask = 0xFF;
self.scrollView.contentMode = UIViewContentModeCenter;
self.scrollView.contentSize = CGSizeMake(3 * CGRectGetWidth(self.frame), 0);//.scrollView.frame
self.scrollView.delegate = self;
self.scrollView.contentOffset = CGPointMake(CGRectGetWidth(self.frame), 0);//self.scrollView.frame
self.scrollView.pagingEnabled = YES;
[self addSubview:self.scrollView];
_scrollView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
self.currentPageIndex = 0;
_pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, frame.size.height - 20, 100, 20)];
CGFloat centerY = _pageControl.center.y;
_pageControl.center = CGPointMake(self.width/2,centerY);
[self addSubview:_pageControl];
}
return self;
}
#pragma mark -
#pragma mark - 私有函数
- (void)configContentViews{
[self.scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
[self setScrollViewContentDataSource];
NSInteger counter = 0;
for (UIView *contentView in self.contentViews) {
contentView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(contentViewTapAction:)];
[contentView addGestureRecognizer:tapGesture];
CGRect rightRect = contentView.frame;
rightRect.origin = CGPointMake((CGRectGetWidth(self.scrollView.frame)) * (counter++), 0);
contentView.frame = rightRect;
[self.scrollView addSubview:contentView];
}
[_scrollView setContentOffset:CGPointMake(_scrollView.frame.size.width, 0)];
if (onlyOnePage) {
[_scrollView setContentSize:CGSizeMake(_scrollView.size.width, _scrollView.size.height)];
}
}
/**
* 设置scrollView的content数据源，即contentViews
*/
- (void)setScrollViewContentDataSource{
NSInteger previousPageIndex = [self getValidNextPageIndexWithPageIndex:self.currentPageIndex - 1];
NSInteger rearPageIndex = [self getValidNextPageIndexWithPageIndex:self.currentPageIndex + 1];
if (self.contentViews == nil) {
self.contentViews = [@[] mutableCopy];
}
[self.contentViews removeAllObjects];
if (self.fetchContentViewAtIndex) {
[self.contentViews addObject:self.fetchContentViewAtIndex(previousPageIndex)];
[self.contentViews addObject:self.fetchContentViewAtIndex(_currentPageIndex)];
[self.contentViews addObject:self.fetchContentViewAtIndex(rearPageIndex)];
}
}
- (NSInteger)getValidNextPageIndexWithPageIndex:(NSInteger)currentPageIndex;
{
if(currentPageIndex == -1) {
return self.totalPageCount - 1;
} else if (currentPageIndex == self.totalPageCount) {
return 0;
} else {
return currentPageIndex;
}
}
#pragma mark -
#pragma mark - UIScrollViewDelegate
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
[self.animationTimer pauseTimer];
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
[self.animationTimer resumeTimerAfterTimeInterval:self.animationDuration];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
int contentOffsetX = scrollView.contentOffset.x;
if(contentOffsetX >= (2 * CGRectGetWidth(scrollView.frame))) {
self.currentPageIndex = [self getValidNextPageIndexWithPageIndex:self.currentPageIndex + 1];
self.pageControl.currentPage = self.currentPageIndex;
// NSLog(@"next，当前页:%d",self.currentPageIndex);
[self configContentViews];
}
if(contentOffsetX <= 0) {
self.currentPageIndex = [self getValidNextPageIndexWithPageIndex:self.currentPageIndex - 1];
self.pageControl.currentPage = self.currentPageIndex;
// NSLog(@"previous，当前页:%d",self.currentPageIndex);
[self configContentViews];
}
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
[scrollView setContentOffset:CGPointMake(CGRectGetWidth(scrollView.frame), 0) animated:YES];
}
#pragma mark -
#pragma mark - 响应事件
- (void)animationTimerDidFired:(NSTimer *)timer
{
CGPoint newOffset = CGPointMake(self.scrollView.contentOffset.x + CGRectGetWidth(self.scrollView.frame), self.scrollView.contentOffset.y);
[self.scrollView setContentOffset:newOffset animated:YES];
}
- (void)contentViewTapAction:(UITapGestureRecognizer *)tap
{
if (self.TapActionBlock) {
self.TapActionBlock(self.currentPageIndex);
}
}
#pragma mark - 暂停 开始
- (void)pause{
[self.animationTimer pauseTimer];
}
- (void)restart{
[self.animationTimer resumeTimer];
}
@end