轮播图播放的主要技术在于：
cell的封装。这里采用UICollectionViewCell实现。
#import <UIKit/UIKit.h>
@interface CircleViewCell : UICollectionViewCell
@property (nonatomic, strong) UIImage* image;
@property (nonatomic, assign) NSInteger index;
@end
//
// CircleViewCell.m
// lunbo
//
// Created by JIAOXIANGJIE on 16/10/12.
// Copyright © 2016年 lumen. All rights reserved.
//
#import "CircleViewCell.h"
@interface CircleViewCell()
@property (nonatomic, strong) UIImageView* imageview;
@end
@implementation CircleViewCell
-(instancetype)init{
if(self = [super init]){
[self myInit];
}
return self;
}
-(instancetype)initWithCoder:(NSCoder *)aDecoder
{
if(self = [super initWithCoder:aDecoder])
[self myInit];
return self;
}
-(instancetype)initWithFrame:(CGRect)frame
{
if(self = [super initWithFrame:frame])
[self myInit];
return self;
}
-(void)layoutSubviews
{
[super layoutSubviews];
self.imageview.frame = self.contentView.bounds;
}
-(UIImageView*)imageview
{
if(_imageview == nil){
_imageview = [[UIImageView alloc] init];
_imageview.contentMode = UIViewContentModeScaleAspectFill;
_imageview.userInteractionEnabled = YES;
_imageview.backgroundColor = [UIColor whiteColor];
}
return _imageview;
}
-(void)setImage:(UIImage *)image
{
_image = image;
self.imageview.image = image;
}
//
// CircleScrollView.h
// lunbo
//
// Created by JIAOXIANGJIE on 16/10/12.
// Copyright © 2016年 lumen. All rights reserved.
//
#import <UIKit/UIKit.h>
@class CircleScrollView;
@protocol CircleScrollViewDelegate <NSObject>
- (void)didClickImageAtIndex:(NSInteger)index scrollView:(CircleScrollView *)scrollView;
@end
@interface CircleScrollView : UIView
@property (nonatomic, weak) id<CircleScrollViewDelegate> delegate;//设置代理
@property (nonatomic, assign) NSTimeInterval duringTimel;//间隔时间
-(void)images:(NSArray*)images;
-(void)closeTimer;
-(void)openTimer;
@end
-(void)myInit{
[self.contentView addSubview:self.imageview];
}
@end
//
// CircleScrollView.m
// lunbo
//
// Created by JIAOXIANGJIE on 16/10/12.
// Copyright © 2016年 lumen. All rights reserved.
//
#import "CircleScrollView.h"
#import "CircleViewCell.h"
@interface CircleScrollView()<UICollectionViewDataSource,UICollectionViewDelegate>
@property (nonatomic, strong) UICollectionView* collectionView;
@property (nonatomic, strong) NSArray* images;//图片数组
@property (nonatomic, assign) NSInteger imagecount;//图片数量
@property (nonatomic, strong) NSMutableArray* cellData;//数组
@property (nonatomic, strong) UIPageControl* pageControl;
@property (nonatomic, strong) NSTimer* timer;
@property (nonatomic, strong) NSLock* mlock;//加锁 用于多线程
@end
@implementation CircleScrollView
static NSString *CollectionCellID = @"CollectionCellID";
-(instancetype)initWithFrame:(CGRect)frame
{
if(self = [super initWithFrame:frame]){
//初始化数据信息
UICollectionViewFlowLayout* flowLayout = [[UICollectionViewFlowLayout alloc] init];
flowLayout.itemSize = frame.size;
flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
flowLayout.minimumLineSpacing = 0;
flowLayout.minimumInteritemSpacing = 0;
flowLayout.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0);
self.collectionView = [[UICollectionView alloc] initWithFrame:self.bounds
collectionViewLayout:flowLayout];
self.collectionView.delegate = self;
self.collectionView.dataSource = self;
self.collectionView.pagingEnabled = YES;
self.collectionView.showsHorizontalScrollIndicator = NO;
self.collectionView.showsVerticalScrollIndicator = NO;
self.collectionView.alwaysBounceHorizontal = YES;
self.collectionView.alwaysBounceVertical = NO;
self.collectionView.backgroundColor = [UIColor whiteColor];
[self.collectionView registerClass:[CircleViewCell class]
forCellWithReuseIdentifier:CollectionCellID];
[self addSubview:self.collectionView];
self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake( 0, self.bounds.size.height - 30, self.bounds.size.width, 30)];
self.pageControl.tag = 100;
self.pageControl.userInteractionEnabled = NO;
[self addSubview:self.pageControl];
[self bringSubviewToFront:self.pageControl];
self.backgroundColor = [UIColor whiteColor];
self.mlock = [[NSLock alloc] init];
}
return self;
}
-(void)setDuringTimel:(NSTimeInterval)duringTimel
{
_duringTimel = duringTimel;
if(duringTimel < 0.001)
return;
[self closeTimer];
[self openTimer];
}
-(void)images:(NSArray*)images
{
[self.mlock lock];
[self closeTimer];
_images = images;
_imagecount = images.count;
self.cellData = [[NSMutableArray alloc] init];
for(NSInteger i = 0; i < 100; i++){
for (NSInteger j = 0; j < _imagecount; j++) {
[self.cellData addObject:@(j)];
}
}
[self.collectionView reloadData];
[self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForRow:50 * _imagecount inSection:0]
atScrollPosition:UICollectionViewScrollPositionLeft
animated:NO];
//设置
self.pageControl.hidden = _imagecount > 0 ? NO: YES;
self.pageControl.numberOfPages = _imagecount;
self.pageControl.currentPage = 0;
[self openTimer];
[self.mlock unlock];
}
-(void)closeTimer
{
if(self.timer)
[self.timer invalidate];
}
-(void)openTimer
{
if(_duringTimel > 0.8)
self.timer = [NSTimer scheduledTimerWithTimeInterval:_duringTimel
target:self
selector:@selector(onTimer)
userInfo:nil
repeats:YES];
}
-(void)onTimer
{
if(self.cellData.count > 0){
NSArray* array = [self.collectionView indexPathsForVisibleItems];
if(array.count == 0)
return;
NSIndexPath* indexPath = array[0];
NSInteger row = indexPath.row;
if(row % _imagecount == 0){
row = 50 * _imagecount;
[self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForRow:row inSection:0] atScrollPosition:UICollectionViewScrollPositionLeft animated:NO];
}
[self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForRow:row + 1 inSection:0] atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];
self.pageControl.currentPage = (row + 1) % _imagecount;
}
}
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return self.cellData.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
CircleViewCell* cell = [collectionView dequeueReusableCellWithReuseIdentifier:CollectionCellID forIndexPath:indexPath];
NSInteger index = [_cellData[indexPath.row] integerValue];
cell.image = _images[index];
cell.index = index;
return cell;
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
// 动画停止, 重新定位到第 50 组模型
int inc = ((int)(scrollView.contentOffset.x / scrollView.frame.size.width)) % _imagecount;
[self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForRow:50 * _imagecount + inc inSection:0] atScrollPosition:UICollectionViewScrollPositionLeft animated:NO];
// 设置 PageControl
self.pageControl.currentPage = inc;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
CircleViewCell *cell = (CircleViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
if ([self.delegate respondsToSelector:@selector(didClickImageAtIndex:scrollView:)]) {
[self.delegate didClickImageAtIndex:cell.index scrollView:self];
}
}
@end
//
// ViewController.m
// lunbo
//
// Created by JIAOXIANGJIE on 16/10/12.
// Copyright © 2016年 lumen. All rights reserved.
//
#import "ViewController.h"
#import "CircleScrollView.h"
@interface ViewController ()<CircleScrollViewDelegate>
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor lightGrayColor];
CGSize size = [UIScreen mainScreen].bounds.size;
CircleScrollView* scrollview = [[CircleScrollView alloc] initWithFrame:CGRectMake(0, 20, size.width, size.width * 504 / 1080)];
scrollview.delegate = self;
[scrollview images:@[[UIImage imageNamed:@"photo_loading"]]]; // 占位图
[self.view addSubview:scrollview];
UIImage *m1 = [UIImage imageNamed:@"m1.jpg"];
UIImage *m2 = [UIImage imageNamed:@"m2.jpg"];
UIImage *m3 = [UIImage imageNamed:@"m3.jpg"];
UIImage *m4 = [UIImage imageNamed:@"m4.jpg"];
UIImage *m5 = [UIImage imageNamed:@"m5.jpg"];
CircleScrollView* scroll1 = [[CircleScrollView alloc] initWithFrame:CGRectMake(0, 220, size.width, size.width * 504 / 1080)];
scroll1.delegate = self;
scroll1.duringTimel = 1.0;
[scroll1 images:@[m1,m2]];
CircleScrollView* view = [[CircleScrollView alloc] initWithFrame:CGRectMake( 0, 420, size.width, size.width * 504 / 1080)];
view.delegate = self;
[view images:@[m1, m2, m3, m4, m5]];
[self.view addSubview:view];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)didClickImageAtIndex:(NSInteger)index scrollView:(CircleScrollView *)scrollView {
NSLog(@"%li", index);
}
@end
效果图：
