iOS輪播圖廣告圖

阿新 • • 發佈：2019-02-13

iOS介面上經常見到無限輪播圖，n張圖片輪流播放。
下面給出一個解決方案和demo（https://github.com/zhengwenming/WMBannerView）。
demo可設定輪播時間，可輪播本地和網路圖片（可設定預設的placeholder），支援手動和自動無限迴圈輪播。
滾動輪播圖
思路是這樣的，我們做一個WMBannerView繼承UIView，給出初始化方法，
-(instancetype)initWithFrame:(CGRect)frame withURLArrayOrImagesArray:(NSArray *)dataArray;
這個初始化方法會傳進去一個數組，這個數組裡面可以放本地的UIImage物件，也可以放網路上圖片的URL。這個WMBannerView裡面有一個UIScrollView，用這個UIScrollView去不斷的載入上中下這三個imageView。到達最後一個iamge的時候，再滑動就載入第一個，如果反過來滑動到第一個圖片，再滑動，就載入最後一個ImageView。具體的看程式碼實現。
.h檔案裡的程式碼：
#import < UIKit/UIKit.h>

typedef NS_ENUM(NSInteger,WMPageContolAlignment) {
WMPageContolAlignmentCenter, /*< 滾動點居中 /
/* */
WMPageContolAlignmentRight, /*< 滾動點居右 /
/* */
WMPageContolAlignmentNone /*< 滾動點隱藏 /
};

typedef void(^TapActionBlock)(NSInteger index);

@interface WMBannerView : UIView

/* 播放週期,預設五秒鐘如設定0則不播放 */
@property(nonatomic,assign)NSTimeInterval animationDuration;
/* 滾動點對齊方式，預設居中 */
@property(nonatomic,assign)WMPageContolAlignment pageControlAlignment;

/* 預設圖片，下載未完成時顯示網路圖片的時候設定*/
/* 注意：賦值必須寫在Start方法之前，否則仍然為nil */
@property(nonatomic,strong)UIImage *placeHoldImage;

/* 資料來源 **/
@property(nonatomic,copy)NSArray *dataArray;

/**
* 初始化廣告播放滾動View
*
* @param rect 尺寸位置
* @param dataArray 圖片資料來源
*/
-(instancetype)initWithFrame:(CGRect)frame withURLArrayOrImagesArray:(NSArray *)dataArray;
/**
* 開始播放，預設五秒鐘,點選響應block回撥
*
* @param block 回撥，返回當前圖片index，不需要回調則設定為nil
*/
- (void)startWithTapActionBlock:(TapActionBlock)block;

/**
* 停止播放
*/
- (void)stop;
@end

再看.m實現檔案裡面的程式碼
依賴庫為SDWebImage
#import “UIImageView+WebCache.h”
#import “WMBannerView.h”

@interface WMBannerView ()
//容器
@property(nonatomic,strong)UIScrollView *scrollView;
/* 滾動圓點 **/
@property(nonatomic,strong)UIPageControl *pageControl;
/* 定時器 **/
@property(nonatomic,strong)NSTimer *animationTimer;
/* 當前index **/
@property(nonatomic,assign)NSInteger currentPageIndex;
/* 所有的圖片陣列 **/
@property(nonatomic,strong)NSMutableArray *imageArray;
/* 當前圖片陣列，永遠只儲存三張圖 **/
@property(nonatomic,strong)NSMutableArray *currentArray;
/* block方式接收回調 */
@property(nonatomic,copy)TapActionBlock block;
@end

@implementation WMBannerView

-(instancetype)initWithFrame:(CGRect)frame withURLArrayOrImagesArray:(NSArray *)dataArray{
self = [super initWithFrame:frame];
if (self) {
self.dataArray = dataArray;
self.autoresizesSubviews = YES;
self.scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
self.scrollView.contentMode = UIViewContentModeCenter;
self.scrollView.contentSize = CGSizeMake(3 *frame.size.width, frame.size.height);
self.scrollView.delegate = self;
self.scrollView.contentOffset = CGPointMake(frame.size.width, 0);
self.scrollView.pagingEnabled = YES;
self.scrollView.showsHorizontalScrollIndicator = NO;
self.scrollView.showsVerticalScrollIndicator = NO;
[self addSubview:self.scrollView];

    //設定分頁顯示的圓點
    _pageControl = [[UIPageControl alloc] init];
    _pageControl.alpha = 0.8;
    _pageControl.currentPageIndicatorTintColor = [UIColor redColor];
    _pageControl.pageIndicatorTintColor = [UIColor whiteColor];
    [self addSubview:_pageControl];

    //點選事件
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap)];
    [self addGestureRecognizer:tapGesture];

    //預設五秒鐘迴圈播放
    self.animationDuration = 5;
    //預設居中
    self.pageContolAliment = WMPageContolAlignmentCenter;
    //預設第一張
    self.currentPageIndex = 0;
}
return self;

}

-(void)layoutSubviews{
[super layoutSubviews];
self.scrollView.frame = self.bounds;
}

-(void)setPageContolAliment:(WMPageContolAlignment)pageContolAliment{
_pageControlAlignment = pageContolAliment;
_pageControl.hidden = NO;
switch (pageContolAliment) {
case WMPageContolAlignmentCenter:
{
_pageControl.frame = CGRectMake(0, CGRectGetHeight(self.scrollView.frame) - 20, CGRectGetWidth(self.scrollView.frame), 10);
}
break;
case WMPageContolAlignmentRight:
{
CGSize size = CGSizeMake(self.dataArray.count * 10 * 1.2, 10);
CGFloat x = self.scrollView.frame.size.width - size.width - 10;
CGFloat y = self.scrollView.frame.size.height - 20;
_pageControl.frame = CGRectMake(x, y, size.width, size.height);
}
break;
case WMPageContolAlignmentNone:
_pageControl.hidden = YES;
break;

    default:
        break;
}

}

-(void)setAnimationDuration:(NSTimeInterval)animationDuration{
_animationDuration = animationDuration;

[self.animationTimer invalidate];
self.animationTimer = nil;

if (animationDuration <= 0) {
    return;
}

self.animationTimer = [NSTimer scheduledTimerWithTimeInterval:_animationDuration
                                                       target:self
                                                     selector:@selector(animationTimerDidFired:)
                                                     userInfo:nil
                                                      repeats:YES];

[self.animationTimer setFireDate:[NSDate distantFuture]];

}

-(void)downLoadImage{
if (self.dataArray && self.dataArray.count > 0) {
if ([self.dataArray.firstObject respondsToSelector:@selector(hasPrefix:)]) {
if ([self.dataArray.firstObject hasPrefix:@”http”]) {//網路圖片
self.imageArray = [NSMutableArray array];
__weak typeof(self) weak = self;
[self.dataArray enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
UIImageView *imageView = [[UIImageView alloc]initWithFrame:self.scrollView.frame];
[imageView sd_setImageWithURL:[NSURL URLWithString:obj] placeholderImage:self.placeHoldImage];
[weak.imageArray addObject:imageView];
}];
_pageControl.numberOfPages = self.dataArray.count;
[self configContentViews];

        }
    }
    else{//本地圖片
        self.imageArray = [NSMutableArray array];
        __weak typeof(self) weak = self;
        [self.dataArray enumerateObjectsUsingBlock:^(UIImage *  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            UIImageView *imageView = [[UIImageView alloc]initWithFrame:self.scrollView.frame];
            imageView.image = obj;
            [weak.imageArray addObject:imageView];
        }];
        _pageControl.numberOfPages = self.dataArray.count;
        [self configContentViews];
    }
}

}

#pragma mark - 私有函式

(void)configContentViews
{
[self.scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

NSInteger previousPageIndex = [self getValidNextPageIndexWithPageIndex:_currentPageIndex - 1];
NSInteger rearPageIndex = [self getValidNextPageIndexWithPageIndex:_currentPageIndex + 1];

self.currentArray = (_currentArray?:[NSMutableArray new]);

_currentArray.count == 0 ?:[_currentArray removeAllObjects];

if (_imageArray) {
if (_imageArray.count >= 3) {
[_currentArray addObject:_imageArray[previousPageIndex]];
[_currentArray addObject:_imageArray[_currentPageIndex]];
[_currentArray addObject:_imageArray[rearPageIndex]];
}
else{
[self getImageFromArray:_imageArray[previousPageIndex]];
[self getImageFromArray:_imageArray[_currentPageIndex]];
[self getImageFromArray:_imageArray[rearPageIndex]];
}
}

[_currentArray enumerateObjectsUsingBlock:^(UIImageView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
obj.userInteractionEnabled = YES;
CGRect rightRect = obj.frame;
rightRect.origin = CGPointMake(CGRectGetWidth(self.frame) * idx, 0);
obj.frame = rightRect;
[self.scrollView addSubview:obj];
}];

[self.scrollView setContentOffset:CGPointMake(CGRectGetWidth(self.scrollView.frame), 0)];
}
(NSInteger)getValidNextPageIndexWithPageIndex:(NSInteger)currentPageIndex;
{
if(currentPageIndex == -1){
return self.dataArray.count - 1;
}
else if (currentPageIndex == self.dataArray.count){
return 0;
}
else
return currentPageIndex;
}

/**
* 解決小於三個圖片顯示的bug
* @param imageView 原始圖
*/
-(void)getImageFromArray:(UIImageView *)imageView{
//開闢自動釋放池
@autoreleasepool {
UIImageView *tempImage = [[UIImageView alloc]initWithFrame:imageView.frame];
tempImage.image = imageView.image;
[_currentArray addObject:tempImage];
}
}

#pragma mark - UIScrollViewDelegate

(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
[self.animationTimer setFireDate:[NSDate distantFuture]];
}
(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
[self.animationTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:self.animationDuration]];
}
(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
int contentOffsetX = scrollView.contentOffset.x;
if(contentOffsetX >= (2 * CGRectGetWidth(scrollView.frame))) {
self.currentPageIndex = [self getValidNextPageIndexWithPageIndex:self.currentPageIndex + 1];
_pageControl.currentPage = _currentPageIndex;
[self configContentViews];
}
if(contentOffsetX <= 0) {
self.currentPageIndex = [self getValidNextPageIndexWithPageIndex:self.currentPageIndex - 1];
_pageControl.currentPage = _currentPageIndex;
[self configContentViews];
}

}

(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
[scrollView setContentOffset:CGPointMake(CGRectGetWidth(scrollView.frame), 0) animated:YES];
}

pragma mark - 迴圈事件
(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];
}

pragma mark - 響應事件
(void)tap
{
if (self.block) {
self.block(self.currentPageIndex);
}
}

pragma mark - 開始滾動

-(void)startWithTapActionBlock:(TapActionBlock)block{
[self.animationTimer setFireDate:[NSDate date]];

[self downLoadImage];

self.block = block;
}

pragma mark - 停止滾動

-(void)stop{
[self.animationTimer invalidate];
}
(void)dealloc
{
self.animationTimer = nil;
self.imageArray = nil;
self.dataArray = nil;
self.scrollView = nil;
}

@end

用法

那麼做好我們的輪播圖WMBannerView了，現在開始用了

WMBannerView　* wmView = [[WMBannerView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.width*3/4) withURLArrayOrImagesArray:URLArray];
wmView.pageControlAlignment = WMPageContolAlignmentCenter;
wmView.placeHoldImage = [UIImage imageNamed:@”placeholderImage”];
wmView.animationDuration = 1.0;//設定滾動的時間間隔，為0的時候不自動滾動
//點選圖片的回撥block，可以知道點選的index
[wmView startWithTapActionBlock:^(NSInteger index) {
NSLog(@”點選了第%@張”,@(index));
}];

然後放置到tableView的tableHeaderView上面

table = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStylePlain];
table.dataSource = self;
table.delegate = self;
table.tableHeaderView = wmView;
table.tableFooterView = [UIView new];
[self.view addSubview:table];

Demo地址

描述：強大的廣告輪播圖，可設定輪播時間，可輪播本地和網路圖片（可設定預設的placeholder），支援手動和自動無限迴圈輪播。可放到UITableView頭上，也可以放置到UICollectionView的頭上。

iOS輪播圖廣告圖

pragma mark - 迴圈事件

pragma mark - 響應事件

pragma mark - 開始滾動

pragma mark - 停止滾動

用法

Demo地址

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pragma mark - 迴圈事件

pragma mark - 響應事件

pragma mark - 開始滾動

pragma mark - 停止滾動

用法

Demo地址

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