自动轮播图(可以有点击事件的其中点击事件用 block 传值)

最新推荐文章于 2022-05-12 09:58:30 发布

原创最新推荐文章于 2022-05-12 09:58:30 发布 · 1k 阅读

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本文详细介绍了如何自定义实现轮播图组件，包括点击图片触发事件、自动循环滚动、页面指示器和定时切换等功能。文章还讨论了在实现过程中使用的关键技术，如block、UIWebView和sdwebimage等，并提供了实例代码供读者参考。

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自动轮播图自己封装的文件其中包括轮播图的点击方法使用了 block
在. h 文件中

import

import “AutoScrollView.h”

import “UIImageView+WebCache.h”

@interface AutoScrollView ()
@property (nonatomic, strong) UIScrollView *scrollView;
@property (nonatomic, strong) UIPageControl *pageControl;
@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, assign) NSInteger currentIndex;
@end
@implementation AutoScrollView

pragma mark - 初始化

(instancetype)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
```
[self pageControllBuild];
[self timerAction];
```
}
return self;
}

pragma mark - 创建 scrollView

(void)scrollViewBuild {
UIScrollView *sc = [[UIScrollView alloc] initWithFrame:self.bounds];
[self addSubview:sc];

self.scrollView = sc;
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * (self.picMutableArray.count + 2), 0);
// 循环附图片
for (int i = 0; i < self.picMutableArray.count + 2; i++) {
UIImageView imageView = [[UIImageView alloc] initWithFrame:CGRectMake(self.scrollView.frame.size.width i, 0, self.scrollView.frame.size.width, self.scrollView.frame.size.height)];
```
imageView.userInteractionEnabled = YES;
[imageView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewDidTap:)]];

if (i == 0) {
    [imageView sd_setImageWithURL:[NSURL URLWithString:self.picMutableArray[self.picMutableArray.count - 1]]];
} else if (i == self.picMutableArray.count + 1) {
    [imageView sd_setImageWithURL:[NSURL URLWithString:self.picMutableArray[0]]];
} else {
    [imageView sd_setImageWithURL:[NSURL URLWithString:self.picMutableArray[i - 1]]];
}
[self.scrollView addSubview:imageView];
```
}
self.scrollView.delegate = self;
self.scrollView.bounces = NO;
self.scrollView.pagingEnabled = YES;
self.scrollView.showsHorizontalScrollIndicator = NO;
self.scrollView.contentOffset = CGPointMake(self.scrollView.frame.size.width, 0);
}
/*点击图片将会被 block/
(void)imageViewDidTap:(UITapGestureRecognizer *)tap {

self.block(self.scrollView.contentOffset.x / self.scrollView.frame.size.width);

}
- (void)scrollViewAction {
if (self.scrollView.contentOffset.x / self.scrollView.frame.size.width == (self.picMutableArray.count)) {
self.scrollView.contentOffset = CGPointMake(0, 0);
} else {
self.scrollView.contentOffset = CGPointMake(self.scrollView.contentOffset.x + self.scrollView.frame.size.width, 0);
}

if (self.scrollView.contentOffset.x / self.scrollView.frame.size.width == self.picMutableArray.count) {
    self.pageControl.currentPage = (self.picMutableArray.count - 1);
    _currentIndex = self.pageControl.currentPage;
} else {

    self.pageControl.currentPage = self.scrollView.contentOffset.x / self.scrollView.frame.size.width - 1;
    _currentIndex = self.pageControl.currentPage;
}

}

pragma mark - 创建 pageControl

(void)pageControllBuild {
UIPageControl pc = [[UIPageControl alloc] initWithFrame:CGRectMake(self.scrollView.frame.size.width 2 / 5, self.scrollView.frame.size.height - 20, self.scrollView.frame.size.width / 5, 10)];
[self addSubview:pc];
_pageControl = pc;
self.pageControl.numberOfPages = self.picMutableArray.count;
[self.pageControl addTarget:self action:@selector(pagecontrolAction:) forControlEvents:UIControlEventValueChanged];
}

pragma mark - NSTimer

(void)timerAction {
self.timer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(scrollViewAction) userInfo:nil repeats:YES];
}
(void)removeTimer {
[self.timer invalidate];
}
(void)dealloc {
[self removeTimer];
}

pragma mark - UIScrollViewDelegate

(UIView )viewForZoomingInScrollView:(UIScrollView )scrollView {
return [scrollView.subviews firstObject];
}
(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
if (scrollView.contentOffset.x / scrollView.frame.size.width == (self.picMutableArray.count + 1)) {
[scrollView setContentOffset:CGPointMake(self.scrollView.frame.size.width, 0) animated:NO];
_pageControl.currentPage = 0;

} else if (scrollView.contentOffset.x / scrollView.frame.size.width == 0) {
[scrollView setContentOffset:CGPointMake(self.picMutableArray.count * self.scrollView.frame.size.width, 0) animated:NO];
_pageControl.currentPage = self.picMutableArray.count;
} else {
_pageControl.currentPage = scrollView.contentOffset.x / scrollView.frame.size.width - 1;
}
}
(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
[self removeTimer];
}
(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
[self timerAction];
}