iOS最笨的办法实现无限轮播图（网络加载）

简单的做了一下：

使用方法： 把 请求返回的 图片地址（字符串类型）放进数组中就行
可以使用SDWebImage（我就是用的这个）等。。需要自己导入并引用，然后修改部分代码
.h文件

//  ScrollViewTimerView.h//  ScrollViewTimer////  Created by 郑鹏 on 2016/12/9.//  Copyright © 2016年 郑鹏. All rights reserved.//#import <UIKit/UIKit.h>@protocol ScrollViewTimerViewDelegate <NSObject>- (void)didSelectScrollViewWithSelectIndex:(NSInteger)selectIndex;@end@interface ScrollViewTimerView : UIView@property (nonatomic, weak) id<ScrollViewTimerViewDelegate> littleSunDelegate;- (instancetype)initWithFrame:(CGRect)frame animationDuration:(NSTimeInterval)animationDuration;@property (nonatomic, strong) NSMutableArray * wheelImgArray;//轮播图 数组//是否需要@property (nonatomic, assign) BOOL isHidePageControl;@end

.m文件

////  ScrollViewTimerView.m//  ScrollViewTimer////  Created by 郑鹏 on 2016/12/9.//  Copyright © 2016年 郑鹏. All rights reserved.//#import "ScrollViewTimerView.h"#import "UIImageView+WebCache.h"@interface ScrollViewTimerView ()<UIScrollViewDelegate>{    NSTimer *_animationTimer;    UIScrollView *_littleSunScrollView;    UIPageControl *_pageControl;}@end@implementation ScrollViewTimerView- (instancetype)initWithFrame:(CGRect)frame animationDuration:(NSTimeInterval)animationDuration{    self = [super initWithFrame:frame];    _littleSunScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];    _littleSunScrollView.delegate = self;    _littleSunScrollView.pagingEnabled = YES;    _littleSunScrollView.showsHorizontalScrollIndicator = NO;    _littleSunScrollView.showsVerticalScrollIndicator = NO;    _littleSunScrollView.contentOffset = CGPointMake(self.frame.size.width, 0);    [self addSubview:_littleSunScrollView];    _animationTimer = [NSTimer scheduledTimerWithTimeInterval:animationDuration                                                           target:self                                                         selector:@selector(animationTimerDidFired:)                                                         userInfo:nil                                                          repeats:YES];    [[NSRunLoop currentRunLoop] addTimer:_animationTimer forMode:UITrackingRunLoopMode];    [self pauseTimer];    return self;}- (void)animationTimerDidFired:(NSTimer *)timer{    CGPoint newOffset = CGPointMake(_littleSunScrollView.contentOffset.x  + CGRectGetWidth(self.frame), _littleSunScrollView.contentOffset.y);    [_littleSunScrollView setContentOffset:newOffset animated:YES];    if (_littleSunScrollView.contentOffset.x >= (_wheelImgArray.count+1)*self.frame.size.width) {        [self startTimerAfterTimeInterval:-2.0f];        [_littleSunScrollView setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO];    }}#pragma mark- UIScrollViewDelegate- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    [self pauseTimer];}- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    [self startTimerAfterTimeInterval:2.0f];}-(void)scrollViewDidScroll:(UIScrollView *)scrollView{    if (_littleSunScrollView.contentOffset.x >= (_wheelImgArray.count+1)*self.frame.size.width) {        [_littleSunScrollView setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO];    }else if (_littleSunScrollView.contentOffset.x <= 0) {        [_littleSunScrollView setContentOffset:CGPointMake(_wheelImgArray.count*self.frame.size.width, 0) animated:NO];    }    if (!_isHidePageControl) {        _pageControl.currentPage = [self getCurrentPageBy:scrollView.contentOffset.x];    }}//公开的属性设置- (void)setWheelImgArray:(NSMutableArray *)wheelImgArray{    if (_wheelImgArray != wheelImgArray) {        _wheelImgArray = wheelImgArray;        _littleSunScrollView.contentSize = CGSizeMake(self.frame.size.width * (wheelImgArray.count + 2), self.frame.size.height);        for (NSInteger i = 0; i < wheelImgArray.count+2; i++) {            if (i == 0) {                [self creatImgViewWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height) WithTag:20161212 + wheelImgArray.count - 1 WithImgName:wheelImgArray[wheelImgArray.count - 1]];            }else if(i !=  wheelImgArray.count+1){                [self creatImgViewWithFrame:CGRectMake(self.frame.size.width*i, 0, self.frame.size.width, self.frame.size.height) WithTag:20161212 + i-1 WithImgName:wheelImgArray[i-1]];            }else if(i == wheelImgArray.count+1){                [self creatImgViewWithFrame:CGRectMake(self.frame.size.width*i, 0, self.frame.size.width, self.frame.size.height) WithTag:20161212 WithImgName:wheelImgArray[0]];            }        }        _pageControl = [[UIPageControl alloc] init];        _pageControl.numberOfPages = _wheelImgArray.count;        _pageControl.frame = CGRectMake(0, self.frame.size.height - 20, self.frame.size.width, 10);        _pageControl.currentPage = 0;        _pageControl.userInteractionEnabled = NO;        [_pageControl setPageIndicatorTintColor:[UIColor colorWithRed:255.0 / 255.0 green:255.0 / 255.0 blue:255.0 / 255.0 alpha:0.5]];        [_pageControl setCurrentPageIndicatorTintColor:[UIColor colorWithRed:255.0 / 255.0 green:255.0 / 255.0 blue:255.0 / 255.0 alpha:1]];        [self addSubview:_pageControl];        [self startTimerAfterTimeInterval:2.0f];    }}- (void)creatImgViewWithFrame:(CGRect)frame WithTag:(NSInteger)tag WithImgName:(NSString *)imgName{    UIImageView *imgView = [[UIImageView alloc] initWithFrame:frame];    imgView.userInteractionEnabled = YES;    imgView.contentMode = UIViewContentModeScaleAspectFill;    imgView.tag = tag;    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickItem:)];    [imgView addGestureRecognizer:tap];    NSURL *imgUrl = [NSURL URLWithString:imgName];    [imgView sd_setImageWithURL:imgUrl placeholderImage:[UIImage imageNamed:@"jiazai"]];    [_littleSunScrollView addSubview:imgView];}-(void)setisHidePageControl:(BOOL)isHidePageControl{    if (_isHidePageControl != isHidePageControl) {        _isHidePageControl = isHidePageControl;        if (_isHidePageControl) {            [_pageControl removeFromSuperview];        }    }}//通过  计算 获取当前页- (NSInteger)getCurrentPageBy:(CGFloat)scrollViewContentOfX{    if (scrollViewContentOfX < self.frame.size.width) {        return _wheelImgArray.count - 1;    }else if (scrollViewContentOfX >= self.frame.size.width && scrollViewContentOfX < (_wheelImgArray.count+1)*self.frame.size.width) {        return scrollViewContentOfX/self.frame.size.width - 1;    }else{        return 0;    }}//_animationTimer暂停-(void)pauseTimer{    if (![_animationTimer isValid]) {        return ;    }    [_animationTimer setFireDate:[NSDate distantFuture]];}//_animationTimer开始-(void)startTimer{    if (![_animationTimer isValid]) {        return ;    }    [_animationTimer setFireDate:[NSDate date]];}//_animationTimer在多久后开始- (void)startTimerAfterTimeInterval:(NSTimeInterval)interval{    if (![_animationTimer isValid]) {        return ;    }    [_animationTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:interval]];}#pragma mark-  实现代理- (void)clickItem:(UITapGestureRecognizer *)tap{    UIView *view = tap.view;    if ([self.littleSunDelegate respondsToSelector:@selector(didSelectScrollViewWithSelectIndex:)]) {        [self.littleSunDelegate didSelectScrollViewWithSelectIndex:view.tag - 20161212];    }}/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect {    // Drawing code}*/@end