iOS 用UIScrollView,UIPageControl制作轮播图

最新推荐文章于 2024-06-19 00:10:20 发布

xiaoliu_iOS

最新推荐文章于 2024-06-19 00:10:20 发布

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分类专栏： UI 文章标签：界面 uiscrollview ios 轮播图 ui

本文链接：https://blog.youkuaiyun.com/xiaoliu_iOS/article/details/50432239

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本文详细介绍了如何在视图加载完毕后进行布局优化，包括滚动视图、图片展示和分页控件的实现，同时引入定时器调整滚动位置，确保用户在浏览过程中获得流畅的体验。

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- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

[self layoutScrollView];

[self layoutImageView];

[self layoutPageControl];

[self addTimer1];

}

#pragma mark - 布局scrollView

- (void)layoutScrollView{

self.scrollView = [[UIScrollView alloc] initWithFrame:[UIScreen mainScreen].bounds];

self.scrollView.contentSize = CGSizeMake(kScreenWidth * 7, kScreenHeight);

self.scrollView.pagingEnabled = YES;

self.scrollView.showsHorizontalScrollIndicator = NO;

self.scrollView.showsVerticalScrollIndicator = NO;

self.scrollView.delegate = self;

[self.view addSubview:self.scrollView];

[self.scrollView release];

}

#pragma mark - 布局图片

- (void)layoutImageView{

for (int i = 0; i < 7; i++) {

UIImageView *imageV = [[UIImageView alloc] initWithFrame:CGRectMake(kScreenWidth * (i + 1), 20, kScreenWidth, kScreenHeight / 3)];

NSString *imageName = [NSString stringWithFormat:@"p%d", i + 1];

NSString *filePath = [[NSBundle mainBundle] pathForResource:imageName ofType:@"jpg"];

imageV.image = [UIImage imageWithContentsOfFile:filePath];

[self.scrollView addSubview:imageV];

[imageV release];

}

UIImageView *imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 20, kScreenWidth, kScreenHeight / 3)];

NSString *filePath1 = [[NSBundle mainBundle] pathForResource:@"p6" ofType:@"jpg"];

imageView1.image = [UIImage imageWithContentsOfFile:filePath1];

[self.scrollView addSubview:imageView1];

UIImageView *imageView2 = [[UIImageView alloc] initWithFrame:CGRectMake(kScreenWidth * 7, 20, kScreenWidth, kScreenHeight / 3)];

NSString *filePath2 = [[NSBundle mainBundle] pathForResource:@"p1" ofType:@"jpg"];

imageView2.image = [UIImage imageWithContentsOfFile:filePath2];

[self.scrollView addSubview:imageView2];

}

#pragma mark - 布局pageControl

- (void)layoutPageControl{

self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake((kScreenWidth - 120) / 2, 580, 120, 20)];

self.pageControl.pageIndicatorTintColor = [UIColor cyanColor];

self.pageControl.currentPageIndicatorTintColor = [UIColor redColor];

self.pageControl.numberOfPages = 6;

self.pageControl.currentPage = 0;

[self.pageControl addTarget:self action:@selector(handlePageControl:) forControlEvents:UIControlEventValueChanged];

[self.view addSubview:self.pageControl];

[self.pageControl release];

}

- (void)addTimer1{

self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(handleTime) userInfo:nil repeats:YES];

}

- (void)handleTime{

[self.scrollView setContentOffset:CGPointMake(self.scrollView.contentOffset.x + 375, 0) animated:YES];

if (self.scrollView.contentOffset.x == kScreenWidth * 6) {

self.scrollView.contentOffset = CGPointZero;

self.pageControl.currentPage = 0;

}else if (self.scrollView.contentOffset.x == 0){

self.pageControl.currentPage = 6;

}else{

self.pageControl.currentPage = self.scrollView.contentOffset.x / kScreenWidth;

}

#pragma mark - UIScrollViewDelegate

//第一张图片向左拖拽会显示最后一张,最后一张向右拖拽会到第一张

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

if (self.scrollView.contentOffset.x == kScreenWidth * 7) {

self.pageControl.currentPage = 0;

self.scrollView.contentOffset = CGPointMake(kScreenWidth, 0);

}else if (self.scrollView.contentOffset.x == 0){

self.pageControl.currentPage = 6;

self.scrollView.contentOffset = CGPointMake(kScreenWidth * 6, 0);

}else{

self.pageControl.currentPage = scrollView.contentOffset.x / kScreenWidth - 1;

}

- (void)handlePageControl:(UIPageControl *)pageControl{

[self.scrollView setContentOffset:CGPointMake(pageControl.currentPage * kScreenWidth, 0) animated:YES];

}