iOS 一句话添加广告视图， 带点击事件

今天项目又有滚动页了，还好记得以前自己弄过一下下。分分钟搞定到项目中了。
创建一个视图类，继承了UIView， 视图里面使用ScrollView。感觉没啥可写的，直接粘代码咯。

// 使用block回调，如果有点击广告图需求的就可以了，根据index判断是点击了那张图片
typedef void(^Block) (NSInteger index);

@interface AdvertisementView : UIView
// frame 是滚动视图的frame了，  imageNames是图片名称数组， buttonBlock，方法回调
- (instancetype)initWithFrame:(CGRect)frame ImageNames:(NSArray *)imageNames andBlock:(Block)buttonBlock;
@end

实现文件也很简单了

#import "AdvertisementView.h"

@interface AdvertisementView ()<UIScrollViewDelegate>

@property (nonatomic, copy)Block block;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, strong) NSArray *imageNames;
@property (nonatomic, strong) UIScrollView *scrollView;
@property (nonatomic, strong) UIPageControl *pageControl;
@end


@implementation AdvertisementView

- (instancetype)initWithFrame:(CGRect)frame ImageNames:(NSArray *)imageNames andBlock:(Block)buttonBlock {
    if (self = [super initWithFrame:frame]) {
        self.imageNames = [self imageNamesWithImageNames:imageNames];
        self.block = buttonBlock;
        self.width = frame.size.width;
        self.height = frame.size.height;
        [self addSubview:[UIView new]];
        [self scrollView];
        [self pageControl];
        
        [self.scrollView setContentOffset:CGPointMake(self.scrollView.frame.size.width, 0) animated:NO];
        
        // 自动
        [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(changeOffset:) userInfo:nil repeats:YES];
        
    }
    return self;
}

#pragma mark - Normal Mehod
- (NSArray *)imageNamesWithImageNames:(NSArray *)imageNames {
    NSMutableArray *multiArr = [NSMutableArray new];
    NSString *firstStr = imageNames.firstObject;
    NSString *lastStr = imageNames.lastObject;
    [multiArr addObject:lastStr];
    [multiArr addObjectsFromArray:imageNames];
    [multiArr addObject:firstStr];
    return  [multiArr copy];
}


- (void)changeOffset:sender{
    //动画修改偏移量   Duration:动画时长
    [UIView animateWithDuration:1 animations:^{
        //动画终结状态时,视图的样式
        self.scrollView.contentOffset = CGPointMake(self.scrollView.contentOffset.x + self.scrollView.frame.size.width, 0);
    } completion:^(BOOL finished) {
        //动画结束后,调用
        [self scrollViewDidEndDecelerating:self.scrollView];
    }];
}
#pragma mark - UIScrollView Delegate
//只有是用手势滑动, 才触发
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

    CGFloat width = scrollView.frame.size.width;
    long int page = lroundf(scrollView.contentOffset.x / width);
    // 2 1 2 1
    if (page == 0) {
        [scrollView setContentOffset:CGPointMake((self.imageNames.count -2)*width, 0) animated:NO];
        return;
    }
    if (page == self.imageNames.count - 1) {
        [scrollView setContentOffset:CGPointMake(width, 0) animated:NO];
        return;
    }
    self.pageControl.currentPage = page - 1;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    
    long int page = lroundf(scrollView.contentOffset.x / scrollView.frame.size.width);
    
    // 2 1 2 1
    if (page == 0) {
        return;
    }
    if (page == self.imageNames.count - 1) {
        return;
    }
    self.pageControl.currentPage = page - 1;
 
}




#pragma mark - lazyMehtod
- (UIScrollView *)scrollView {
    if(_scrollView == nil) {
        _scrollView = [[UIScrollView alloc] init];
        [self addSubview:_scrollView];
        _scrollView.frame = CGRectMake(0, 0, self.width, self.height);
        _scrollView.contentSize = CGSizeMake(self.width *self.imageNames.count, self.height);
        _scrollView.delegate = self;
        _scrollView.scrollEnabled = YES;
        _scrollView.pagingEnabled = YES;
        _scrollView.showsVerticalScrollIndicator = NO;
        _scrollView.showsHorizontalScrollIndicator = NO;
        _scrollView.bounces = NO;
        
        [self.imageNames enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:obj]];
            imageView.frame = CGRectMake(idx * self.width, 0, self.width, self.height);
            [_scrollView addSubview:imageView];

            UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonAction:)];
            [_scrollView addGestureRecognizer:tap];
        }];

    }
    return _scrollView;
}

- (UIPageControl *)pageControl {
    if(_pageControl == nil) {
        _pageControl = [[UIPageControl alloc] init];
        [self addSubview:_pageControl];
        _pageControl.frame = CGRectMake(0, self.height - 30, self.width, 30);
        _pageControl.numberOfPages = self.imageNames.count - 2;
        _pageControl.pageIndicatorTintColor = [UIColor whiteColor];
        _pageControl.currentPageIndicatorTintColor = [UIColor lightGrayColor];
    }
    return _pageControl;
}


#pragma ButtonAction
- (void)buttonAction:(UITapGestureRecognizer *)tap {
    if (self.block) {
        self.block(self.pageControl.currentPage);
    }
}
@end

写的不完善，需要用的自己修改里面的内容吧