#import @class XRCarouselView;typedef void(^ClickBlock)(NSInteger index);//pageControl的显示位置typedef enum { PositionNone, //默认值 == PositionBottomCenter PositionHide, //隐藏 PositionTopCenter, //中上 PositionBottomLeft, //左下 PositionBottomCenter, //中下 PositionBottomRight //右下} PageControlPosition;@protocol XRCarouselViewDelegate/** * 该方法用来处理图片的点击，会返回图片在数组中的索引 * 代理与block二选一即可，若两者都实现，block的优先级高 * * @param carouselView 控件本身 * @param index 图片索引 */- (void)carouselView:(XRCarouselView *)carouselView didClickImage:(NSInteger)index;@end/** * 说明：要想正常使用，图片数组imageArray必须设置 * 控件的frame必须设置，xib\sb创建的可不设置 * 其他属性都有默认值，可不设置 */@interface XRCarouselView : UIView/* 这里没有提供修改占位图片的接口，如果需要修改，可直接到.m文件中 修改占位图片名称为你想要显示图片的名称，或者将你想要显示图片的 名称修改为placeholder，因为没实际意义，所以就不提供接口了 */#pragma mark 属性/** * 设置分页控件位置，默认为PositionBottomCenter */@property (nonatomic, assign) PageControlPosition pagePosition;/** * 轮播的图片数组，可以是图片，也可以是网络路径 */@property (nonatomic, strong) NSArray *imageArray;/** * 图片描述的字符串数组，应与图片顺序对应 * * 图片描述控件默认是隐藏的 * 设置该属性后，会取消隐藏，显示在图片底部 */@property (nonatomic, strong) NSArray *describeArray;/** * 图片描述控件的背景颜色，默认为黑色半透明 */@property (nonatomic, strong) UIColor *desLabelBgColor;/** * 图片描述控件的字体，默认为13号字体 */@property (nonatomic, strong) UIFont *desLabelFont;/** * 图片描述控件的文字颜色，默认为白色 */@property (nonatomic, strong) UIColor *desLabelColor;/** * 每一页停留时间，默认为5s，最少1s * 当设置的值小于1s时，则为默认值 */@property (nonatomic, assign) NSTimeInterval time;/** * 点击图片后要执行的操作，会返回图片在数组中的索引 */@property (nonatomic, copy) ClickBlock imageClickBlock;/** * 代理，用来处理图片的点击 */@property (nonatomic, weak) iddelegate;
#pragma mark 构造方法
/**
* 构造方法
*
* @param imageArray 图片数组
* @param describeArray 图片描述数组
*
*/
- (instancetype)initWithFrame:(CGRect)frame imageArray:(NSArray *)imageArray;
+ (instancetype)carouselViewWithFrame:(CGRect)frame imageArray:(NSArray *)imageArray;
- (instancetype)initWithImageArray:(NSArray *)imageArray describeArray:(NSArray *)describeArray;
+ (instancetype)carouselViewWithImageArray:(NSArray *)imageArray describeArray:(NSArray *)describeArray;
#pragma mark 方法
/**
* 开启定时器
* 默认已开启，调用该方法会重新开启
*/
- (void)startTimer;
/**
* 停止定时器
* 停止后，如果手动滚动图片，定时器会重新开启
*/
- (void)stopTimer;
/**
* 设置分页控件指示器的图片
* 两个图片都不能为空，否则设置无效
* 不设置则为系统默认
*
* @param pageImage 其他页码的图片
* @param currentImage 当前页码的图片
*/
- (void)setPageImage:(UIImage *)pageImage andCurrentImage:(UIImage *)currentImage;
/**
* 设置分页控件指示器的颜色
* 不设置则为系统默认
*
* @param color 其他页码的颜色
* @param currentColor 当前页码的颜色
*/
- (void)setPageColor:(UIColor *)color andCurrentPageColor:(UIColor *)currentColor;
/**
* 清除沙盒中的图片缓存
*/
- (void)clearDiskCache;
@end
#import "XRCarouselView.h"#define DEFAULTTIME 3#define Margin 10typedef enum{ DirecNone, DirecLeft, DirecRight} Direction;@interface XRCarouselView()//轮播的图片数组
@property (nonatomic, strong) NSMutableArray *images;
//下载的图片字典
@property (nonatomic, strong) NSMutableDictionary *imageDic;
//下载图片的操作
@property (nonatomic, strong) NSMutableDictionary *operationDic;
//滚动方向
@property (nonatomic, assign) Direction direction;
//图片描述控件，默认在底部
@property (nonatomic, strong) UILabel *describeLabel;
//分页控件
@property (nonatomic, strong) UIPageControl *pageControl;
//显示的imageView
@property (nonatomic, strong) UIImageView *currImageView;
//辅助滚动的imageView
@property (nonatomic, strong) UIImageView *otherImageView;
//当前显示图片的索引
@property (nonatomic, assign) NSInteger currIndex;
//将要显示图片的索引
@property (nonatomic, assign) NSInteger nextIndex;
//滚动视图
@property (nonatomic, strong) UIScrollView *scrollView;
//pageControl图片大小
@property (nonatomic, assign) CGSize pageImageSize;
//定时器
@property (nonatomic, strong) NSTimer *timer;
//任务队列
@property (nonatomic, strong) NSOperationQueue *queue;
@end
@implementation XRCarouselView
#pragma mark- 初始化方法
//创建用来缓存图片的文件夹
+ (void)initialize {
NSString *cache = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"XRCarousel"];
BOOL isDir = NO;
BOOL isExists = [[NSFileManager defaultManager] fileExistsAtPath:cache isDirectory:&isDir];
if (!isExists || !isDir) {
[[NSFileManager defaultManager] createDirectoryAtPath:cache withIntermediateDirectories:YES attributes:nil error:nil];
}
}
#pragma mark- frame相关
- (CGFloat)height {
return self.scrollView.frame.size.height;
}
- (CGFloat)width {
return self.scrollView.frame.size.width;
}
#pragma mark- 懒加载
- (NSMutableDictionary *)imageDic{
if (!_imageDic) {
_imageDic = [NSMutableDictionary dictionary];
}
return _imageDic;
}
- (NSMutableDictionary *)operationDic{
if (!_operationDic) {
_operationDic = [NSMutableDictionary dictionary];
}
return _operationDic;
}
- (NSOperationQueue *)queue {
if (!_queue) {
_queue = [[NSOperationQueue alloc] init];
}
return _queue;
}
- (UIScrollView *)scrollView {
if (!_scrollView) {
_scrollView = [[UIScrollView alloc] init];
_scrollView.pagingEnabled = YES;
_scrollView.bounces = NO;
_scrollView.showsHorizontalScrollIndicator = NO;
_scrollView.showsVerticalScrollIndicator = NO;
_scrollView.delegate = self;
_currImageView = [[UIImageView alloc] init];
_currImageView.userInteractionEnabled = YES;
[_currImageView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageClick)]];
[_scrollView addSubview:_currImageView];
_otherImageView = [[UIImageView alloc] init];
[_scrollView addSubview:_otherImageView];
}
return _scrollView;
}
- (UILabel *)describeLabel {
if (!_describeLabel) {
_describeLabel = [[UILabel alloc] init];
_describeLabel.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
_describeLabel.textColor = [UIColor whiteColor];
_describeLabel.textAlignment = NSTextAlignmentCenter;
_describeLabel.font = [UIFont systemFontOfSize:13];
_describeLabel.hidden = YES;
}
return _describeLabel;
}
- (UIPageControl *)pageControl {
if (!_pageControl) {
_pageControl = [[UIPageControl alloc] init];
_pageControl.hidesForSinglePage = YES;
_pageControl.userInteractionEnabled = NO;
_pageControl.pageIndicatorTintColor = [UIColor colorWithRed:255/255.0 green:255/255.0 blue:255/255.0 alpha:0.5];
_pageControl.currentPageIndicatorTintColor = [UIColor redColor];
}
return _pageControl;
}
#pragma mark- 构造方法
- (instancetype)initWithFrame:(CGRect)frame imageArray:(NSArray *)imageArray {
if (self = [super initWithFrame:frame]) {
self.imageArray = imageArray;
}
return self;
}
+ (instancetype)carouselViewWithFrame:(CGRect)frame imageArray:(NSArray *)imageArray {
return [[self alloc] initWithFrame:frame imageArray:imageArray];
}
- (instancetype)initWithImageArray:(NSArray *)imageArray describeArray:(NSArray *)describeArray {
if (self = [self initWithFrame:CGRectZero imageArray:imageArray]) {
self.describeArray = describeArray;
}
return self;
}
+ (instancetype)carouselViewWithImageArray:(NSArray *)imageArray describeArray:(NSArray *)describeArray {
return [[self alloc] initWithImageArray:imageArray describeArray:describeArray];
}
#pragma mark- --------设置相关方法--------
#pragma mark 设置控件的frame，并添加子控件
- (void)setFrame:(CGRect)frame {
[super setFrame:frame];
[self addSubview:self.scrollView];
[self addSubview:self.describeLabel];
[self addSubview:self.pageControl];
}
#pragma mark 设置滚动方向
- (void)setDirection:(Direction)direction {
if (_direction == direction) return;
_direction = direction;
if (direction == DirecNone) return;
if (direction == DirecRight) {
self.otherImageView.frame = CGRectMake(0, 0, self.width, self.height);
self.nextIndex = self.currIndex - 1;
if (self.nextIndex < 0) self.nextIndex = _images.count - 1;
} else if (direction == DirecLeft){
self.otherImageView.frame = CGRectMake(CGRectGetMaxX(_currImageView.frame), 0, self.width, self.height);
self.nextIndex = (self.currIndex + 1) % _images.count;
}
self.otherImageView.image = self.images[self.nextIndex];
}
#pragma mark 设置图片数组
- (void)setImageArray:(NSArray *)imageArray{
if (!imageArray.count) return;
_imageArray = imageArray;
_images = [NSMutableArray array];
for (int i = 0; i < imageArray.count; i++) {
if ([imageArray[i] isKindOfClass:[UIImage class]]) {
[_images addObject:imageArray[i]];
} else if ([imageArray[i] isKindOfClass:[NSString class]]){
[_images addObject:[UIImage imageNamed:@"placeholder"]];
[self downloadImages:i];
}
}
self.currImageView.image = _images.firstObject;
self.pageControl.numberOfPages = _images.count;
}
#pragma mark 设置描述数组
- (void)setDescribeArray:(NSArray *)describeArray{
_describeArray = describeArray;
//如果描述的个数与图片个数不一致，则补空字符串
if (describeArray && describeArray.count > 0) {
if (describeArray.count < _images.count) {
NSMutableArray *describes = [NSMutableArray arrayWithArray:describeArray];
for (NSInteger i = describeArray.count; i < _images.count; i++) {
[describes addObject:@""];
}
_describeArray = describes;
}
self.describeLabel.hidden = NO;
_describeLabel.text = _describeArray.firstObject;
}
}
#pragma mark 设置scrollView的contentSize
- (void)setScrollViewContentSize {
if (_images.count > 1) {
self.scrollView.contentSize = CGSizeMake(self.width * 3, 0);
self.scrollView.contentOffset = CGPointMake(self.width, 0);
self.currImageView.frame = CGRectMake(self.width, 0, self.width, self.height);
[self startTimer];
} else {
self.scrollView.contentSize = CGSizeZero;
self.scrollView.contentOffset = CGPointZero;
self.currImageView.frame = CGRectMake(0, 0, self.width, self.height);
}
}
#pragma mark 设置图片描述控件
//设置背景颜色
- (void)setDesLabelBgColor:(UIColor *)desLabelBgColor {
_desLabelBgColor = desLabelBgColor;
self.describeLabel.backgroundColor = desLabelBgColor;
}
//设置字体
- (void)setDesLabelFont:(UIFont *)desLabelFont {
_desLabelFont = desLabelFont;
self.describeLabel.font = desLabelFont;
}
//设置文字颜色
- (void)setDesLabelColor:(UIColor *)desLabelColor {
_desLabelColor = desLabelColor;
self.describeLabel.textColor = desLabelColor;
}
#pragma mark 设置pageControl的指示器图片
- (void)setPageImage:(UIImage *)pageImage andCurrentImage:(UIImage *)currentImage {
if (!pageImage || !currentImage) return;
self.pageImageSize = pageImage.size;
[self.pageControl setValue:currentImage forKey:@"_currentPageImage"];
[self.pageControl setValue:pageImage forKey:@"_pageImage"];
}
#pragma mark 设置pageControl的指示器颜色
- (void)setPageColor:(UIColor *)color andCurrentPageColor:(UIColor *)currentColor {
_pageControl.pageIndicatorTintColor = color;
// 设置当前页码指示器的颜色
_pageControl.currentPageIndicatorTintColor = currentColor;
}
#pragma mark 设置pageControl的位置
- (void)setPageControlPosition {
if (_pagePosition == PositionHide) {
_pageControl.hidden = YES;
return;
}
CGSize size;
if (_pageImageSize.width == 0) {//没有设置图片
size = [_pageControl sizeForNumberOfPages:_pageControl.numberOfPages];
size.height = 20;
} else {//设置图片了
size = CGSizeMake(_pageImageSize.width * (_pageControl.numberOfPages * 2 - 1), _pageImageSize.height);
}
_pageControl.frame = CGRectMake(0, 0, size.width, size.height);
if (_pagePosition == PositionNone || _pagePosition == PositionBottomCenter)
_pageControl.center = CGPointMake(self.width * 0.5, self.height - (_describeLabel.hidden? 10 : 30));
else if (_pagePosition == PositionTopCenter)
_pageControl.center = CGPointMake(self.width * 0.5, size.height * 0.5);
else if (_pagePosition == PositionBottomLeft)
_pageControl.frame = CGRectMake(Margin, self.height - (_describeLabel.hidden? size.height : size.height + 20), size.width, size.height);
else
_pageControl.frame = CGRectMake(self.width - Margin - size.width, self.height - (_describeLabel.hidden? size.height : size.height + 20), size.width, size.height);
}
#pragma mark 设置定时器时间
- (void)setTime:(NSTimeInterval)time {
_time = time;
[self startTimer];
}
#pragma mark- --------定时器相关方法--------
- (void)startTimer {
//如果只有一张图片，则直接返回，不开启定时器
if (_images.count <= 1) return;
//如果定时器已开启，先停止再重新开启
if (self.timer) [self stopTimer];
self.timer = [NSTimer timerWithTimeInterval:_time < 1? DEFAULTTIME : _time target:self selector:@selector(nextPage) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
}
- (void)stopTimer {
[self.timer invalidate];
self.timer = nil;
}
- (void)nextPage {
[self.scrollView setContentOffset:CGPointMake(self.width * 2, 0) animated:YES];
}
#pragma mark- -----------其它-----------
#pragma mark 布局子控件
- (void)layoutSubviews {
[super layoutSubviews];
//有导航控制器时，会默认在scrollview上方添加64的内边距，这里强制设置为0
_scrollView.contentInset = UIEdgeInsetsZero;
_scrollView.frame = self.bounds;
_describeLabel.frame = CGRectMake(0, self.height - 20, self.width, 20);
[self setPageControlPosition];
[self setScrollViewContentSize];
}
#pragma mark 图片点击事件
- (void)imageClick {
if (self.imageClickBlock) {
self.imageClickBlock(self.currIndex);
} else if ([_delegate respondsToSelector:@selector(carouselView:didClickImage:)]){
[_delegate carouselView:self didClickImage:self.currIndex];
}
}
#pragma mark 下载网络图片
- (void)downloadImages:(int)index {
NSString *key = _imageArray[index];
//从内存缓存中取图片
UIImage *image = [self.imageDic objectForKey:key];
if (image) {
_images[index] = image;
return;
}
//从沙盒缓存中取图片
NSString *cache = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"XRCarousel"];
NSString *path = [cache stringByAppendingPathComponent:[key lastPathComponent]];
NSData *data = [NSData dataWithContentsOfFile:path];
if (data) {
image = [UIImage imageWithData:data];
_images[index] = image;
[self.imageDic setObject:image forKey:key];
return;
}
//下载图片
NSBlockOperation *download = [self.operationDic objectForKey:key];
if (download) return;
//创建一个操作
download = [NSBlockOperation blockOperationWithBlock:^{
NSURL *url = [NSURL URLWithString:key];
NSData *data = [NSData dataWithContentsOfURL:url];
if (!data) return;
UIImage *image = [UIImage imageWithData:data];
//取到的data有可能不是图片
if (image) {
[self.imageDic setObject:image forKey:key];
self.images[index] = image;
//如果下载的图片为当前要显示的图片，直接到主线程给imageView赋值，否则要等到下一轮才会显示
if (_currIndex == index) [_currImageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO];
[data writeToFile:path atomically:YES];
}
[self.operationDic removeObjectForKey:key];
}];
[self.queue addOperation:download];
[self.operationDic setObject:download forKey:key];
}
#pragma mark 清除沙盒中的图片缓存
- (void)clearDiskCache {
NSString *cache = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"XRCarousel"];
NSArray *contents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:cache error:NULL];
for (NSString *fileName in contents) {
[[NSFileManager defaultManager] removeItemAtPath:[cache stringByAppendingPathComponent:fileName] error:nil];
}
}
#pragma mark 当图片滚动过半时就修改当前页码
- (void)changeCurrentPageWithOffset:(CGFloat)offsetX {
if (offsetX < self.width * 0.5) {
NSInteger index = self.currIndex - 1;
if (index < 0) index = self.images.count - 1;
_pageControl.currentPage = index;
} else if (offsetX > self.width * 1.5){
_pageControl.currentPage = (self.currIndex + 1) % self.images.count;
} else {
_pageControl.currentPage = self.currIndex;
}
}
#pragma mark- --------UIScrollViewDelegate--------
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat offsetX = scrollView.contentOffset.x;
self.direction = offsetX > self.width? DirecLeft : offsetX < self.width? DirecRight : DirecNone;
[self changeCurrentPageWithOffset:offsetX];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
[self stopTimer];
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
[self startTimer];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
[self pauseScroll];
}
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
[self pauseScroll];
}
- (void)pauseScroll {
//等于1表示没滚动
if (self.scrollView.contentOffset.x / self.width == 1) return;
self.currIndex = self.nextIndex;
self.pageControl.currentPage = self.currIndex;
self.currImageView.frame = CGRectMake(self.width, 0, self.width, self.height);
self.describeLabel.text = self.describeArray[self.currIndex];
self.currImageView.image = self.otherImageView.image;
self.scrollView.contentOffset = CGPointMake(self.width, 0);
}
@end