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摘要 iOS下实现的一个简单的循环播放小广告的控件,为了节约内存,使用三个imageview来实现
1.原理:图片:图片集合名称保存成array;
轮播:为了实现滑动效果,至少需要三个imageview,为了确保左右滑动,需要一直显示中间的view
每次滑动后都需要重新加载三个view的图片。并设置当前图片下标
2.接口:提供给viewcontroller一个判断左右滑动的接口,并实现滑动效果
提供给pagecontroller一个设置页面的接口,根据下标设置当前现实页
3.代码:ADScrollView,附详细注释
.h
@interface ADScrollView : UIScrollView { NSTimer *_timer; } @property (nonatomic, retain) NSMutableArray *ads; // 图集 @property (nonatomic, retain) NSMutableArray *images; // 视图集合(三个视图,左中右) @property (nonatomic, assign) NSUInteger nowImageIndex; // 当前图片下表 @property (nonatomic, assign) CGPoint curPoint; // 当前视图坐标 - (void)changeToImage:(NSUInteger)index; // 改变到某个广告,当我们点击pagecontrol的某个页时,将页号作为参数窜过来,即可实现效果 // 滑动后,将最后的坐标点传过来,即可判断是左滑还是右滑,并实现滑动效果 // 返回1:右滑 -1:左滑 0:未滑动 - (NSInteger)scrollToPoint:(CGPoint)point; @end
.m
@implementation ADScrollView - (void)dealloc { // 关闭定时器并释放 [_timer invalidate]; _timer = nil; } - (id)init { self = [super init]; if (self) { self.ads = [NSMutableArray arrayWithObjects:@"ad01.png", @"ad02.png", @"ad03.jpg", nil]; // scroll的分页设置 self.pagingEnabled = YES; self.showsHorizontalScrollIndicator = NO; self.showsVerticalScrollIndicator = NO; self.contentSize = CGSizeMake(3 * 320, 100.0); NSInteger kCount = [_ads count]; self.images = [[NSMutableArray alloc] initWithCapacity:3]; // 初始化三个切换页 for (int i = 0; i < 3; i++) { UIImageView *view = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[_ads objectAtIndex:(i+kCount-1)%kCount]]]; view.frame = CGRectMake(i*320, 0, 320, 100); [self addSubview:view]; [self.images addObject:view]; } _nowImageIndex = 0; self.bounds = CGRectMake(320, 0, 320, 100); _curPoint = self.bounds.origin; // 当前左上角坐标 // 初始化定时器 _timer = [NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(scrollTimer) userInfo:nil repeats:YES]; //self.adDelegate = nil; } return self; } #pragma mark - 定时器 - (void)scrollTimer { // 自动播放 [self scrollRectToVisible:CGRectMake(640, 0, 320, 100) animated:YES]; } #pragma mark - 设置显示第几页 - (void)changeToImage:(NSUInteger)index { _nowImageIndex = index; // 当前视图下标切换过去 // 设置三个view的显示 self.bounds = CGRectMake(320, 0, 320, 100); ((UIImageView *)[self.images objectAtIndex:2]).image = [UIImage imageNamed:[self.ads objectAtIndex:[self getImageNext]]]; // 加载下一张视图 ((UIImageView *)[self.images objectAtIndex:1]).image = [UIImage imageNamed:[self.ads objectAtIndex:_nowImageIndex]]; // 加载当前窗口视图 ((UIImageView *)[self.images objectAtIndex:0]).image = [UIImage imageNamed:[self.ads objectAtIndex:[self getImagePre]]]; // 加载上一个窗口视图 } #pragma mark - 判断左滑 右滑 实现滑动效果 - (NSInteger)scrollToPoint:(CGPoint)point { NSInteger dictionary = 0; if (point.x-_curPoint.x == 320.0 || point.x-_curPoint.x == -640.0) { // 右滑 _nowImageIndex = [self getImageNext]; // 获取当前图片下标 dictionary = 1; } else if (0 != point.x - _curPoint.x){ // 左滑 _nowImageIndex = [self getImagePre]; // 获取当前图片下标 dictionary = -1; } // 始终显示的是中间视图,只不过各个视图加载的图片变了 self.bounds = CGRectMake(320, 0, 320, 100); ((UIImageView *)[self.images objectAtIndex:2]).image = [UIImage imageNamed:[self.ads objectAtIndex:[self getImageNext]]]; // 加载下一张视图 ((UIImageView *)[self.images objectAtIndex:1]).image = [UIImage imageNamed:[self.ads objectAtIndex:_nowImageIndex]]; // 加载当前窗口视图 ((UIImageView *)[self.images objectAtIndex:0]).image = [UIImage imageNamed:[self.ads objectAtIndex:[self getImagePre]]]; // 加载上一个窗口视图 return dictionary; // 如果是右滑 返回yes 左滑返回no } #pragma mark - 获取图片下标 - (NSInteger)getImageNext { if (_nowImageIndex == [_ads count] - 1) { return 0; } return _nowImageIndex + 1; } - (NSInteger)getImagePre { if (0 == _nowImageIndex) { return [_ads count]-1; } return _nowImageIndex-1; } @end
ViewController需要设置ADScrollView的委托,并实现两个方法
// scrollview 滑动结束,响应手势滑动处理 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { NSInteger dic = [_adScroll scrollToPoint:scrollView.bounds.origin]; if (1 == dic) { // 右滑 _page.currentPage = (_page.currentPage+1)%_page.numberOfPages; } else if (-1 == dic){ // 左滑 _page.currentPage = (_page.currentPage+_page.numberOfPages-1)%_page.numberOfPages; } } // scrollview动作结束,响应自动轮播方式处理 - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView { NSInteger dic = [_adScroll scrollToPoint:scrollView.bounds.origin]; if (1 == dic) { // 右滑 _page.currentPage = (_page.currentPage+1)%_page.numberOfPages; } else if (-1 == dic){ // 左滑 _page.currentPage = (_page.currentPage+_page.numberOfPages-1)%_page.numberOfPages; } } // uipageControl的响应方法 - (void)scrolTimer:(NSInteger)dictionary { if (1 == dictionary) { _page.currentPage = (_page.currentPage+_page.numberOfPages+1)%_page.numberOfPages; } else if(-1 == dictionary) { _page.currentPage = (_page.currentPage+_page.numberOfPages-1)%_page.numberOfPages; } NSLog(@"%@",_adScroll); }
ps:只需要这些设置就可以实现广告的轮播了,
对于广告的大小可以根据实际情况自己改,
我这个是320*100的尺寸