UIScrollView滚动视图

基本功能


//创建滚动视图

UIScrollView * myScrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];

//滚动视图上加载的控件大小(可大于滚动视图)

myScrollView.contentSize = CGSizeMake(320 * (images.count + 2), 568);

//设定滚动视图首次加载的位置(即偏移量)

myScrollView.contentOffset = CGPointMake(320, 0);

//其set方法

[myScrollView setContentOffset:CGPointMake(320 *(pageCount+1), 0) animated:YES];

//设置翻滚及翻页效果

[myScrollView scrollRectToVisible:CGRectMake(320 * 4, 0, 320, 568) animated:NO];

//animated:控制是否显示快速翻页时的动作效果,关闭则直接显示翻页到当前页,开启则会显示中间的翻动过程

//关闭滚动视图回弹效果,当需要让滚动视图自动循环播放时,该选项需关闭

myScrollView.bounces = YES;//默认为开启

//开启分页效果(当将页面拉至一半时会自动滑到其中一页)

myScrollView.pagingEnabled = YES;

//隐藏滚动条

myScrollView.showsHorizontalScrollIndicator = NO;

//将滚动视图加载到主视图上

[self.view addSubview:myScrollView];

循环滚动功能

循环滚动有两个实现方式

实现方法一


- (void)viewDidLoad {
    [super viewDidLoad];
    
    myScrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
    //关闭滚动视图回弹效果
    //myScrollView.bounces = YES;
    //开启分页效果�
    myScrollView.pagingEnabled = YES;
    myScrollView.showsHorizontalScrollIndicator = NO;//隐藏滚动条
    myScrollView.delegate = self;
    [self.view addSubview:myScrollView];
    
    UIImageView * firstImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];
    firstImageView.image = [UIImage imageNamed:@"d"];
    [myScrollView addSubview:firstImageView];
    
    NSArray * images = @[@"a",@"b",@"c",@"d"];
    
    for (int i = 0; i < images.count; i++) {
        UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(320 * i + 320, 0, 320, 568)];
        imageView.image = [UIImage imageNamed:images[i]];
        [myScrollView addSubview:imageView];
    }
    
    UIImageView * lastImageView = [[UIImageView alloc] initWithFrame:CGRectMake(320 * images.count + 320, 0, 320, 568)];
    lastImageView.image = [UIImage imageNamed:@"a"];
    [myScrollView addSubview:lastImageView];
    
    
    myScrollView.contentSize = CGSizeMake(320 * (images.count + 2), 568);
    
    myScrollView.contentOffset = CGPointMake(320, 0);
    
    
    pageCount = 0;
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(change:) userInfo:nil repeats:YES];
    
}


-(void)change:(id)sender
{
    if (pageCount == 4) {
        pageCount = 1;
        [myScrollView scrollRectToVisible:CGRectMake(320 , 0, 320, 568) animated:NO];
    }else{
        pageCount++;
    }
    
    [myScrollView setContentOffset:CGPointMake(320 *(pageCount+1), 0) animated:YES];
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    //第一页和倒数第二页一致,倒数最后一页和第二页一致,当跳到第一页或最后一页时直接跳转,因为页面一样,跳过去并不会有明显的动画,接下来则是正常的页面跳转。
    if ((int)scrollView.contentOffset.x % (int)self.view.bounds.size.width == 0) {
        if ((int)scrollView.contentOffset.x / (int)self.view.bounds.size.width == 0) {
            //视图向前滚动到第一页(即多出来表示最后一页的页面),则自动跳到倒数第二页(表面上的最后一页)。
            [myScrollView scrollRectToVisible:CGRectMake(320 * 4, 0, 320, 568) animated:NO];
        }else if ((int)scrollView.contentOffset.x / (int)self.view.bounds.size.width == 5){
            //视图滚动到最后一页(即表面上的第一页),则自动跳到第二页
            [myScrollView scrollRectToVisible:CGRectMake(320 , 0, 320, 568) animated:NO];
        }
    }
}


实现方法二

此处未实现手动滑动的功能

viewDidLoad


#pragma mark 顶部ScrollView
    //高度180
    topScrollView = [[UIScrollView alloc]init];
    [headerView addSubview:topScrollView];
    
    [topScrollView mas_makeConstraints:^(MASConstraintMaker *make) {
        
        make.left.equalTo(headerView.mas_left).with.offset(0);
        make.top.equalTo(headerView.mas_top);
        make.right.equalTo(headerView.mas_right).with.offset(0);
        make.height.mas_equalTo(@(HEIGHT_FOR_TOP_SCROLLVIEW));
        
    }];
    
    topScrollView.pagingEnabled = YES;
    topScrollView.showsHorizontalScrollIndicator = NO;
    topScrollView.showsVerticalScrollIndicator = NO;
    topScrollView.delegate = self;
    
    
    //4张图,正向循环滚动
    
     NSArray * imageTitleArray = @[@"banner轮播图4",@"banner轮播图1",@"banner轮播图2",@"banner轮播图3",@"banner轮播图4",@"banner轮播图1"];
    
    topScrollView.contentSize = CGSizeMake(WIDTH_FOR_SCREEN * imageTitleArray.count, HEIGHT_FOR_TOP_SCROLLVIEW);
    topScrollView.contentOffset = CGPointMake(WIDTH_FOR_SCREEN, 0);
   
    for (int i = 0; i < imageTitleArray.count; i++) {
        UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(i*WIDTH_FOR_SCREEN, 0, WIDTH_FOR_SCREEN, HEIGHT_FOR_TOP_SCROLLVIEW)];
        imageView.image = [UIImage imageNamed:imageTitleArray[i]];
        [topScrollView addSubview:imageView];
        
    }
    
    pageCount = 1;//1代表第二张,即初始张
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(change:) userInfo:nil repeats:YES];
    
    
    //创建分页指示器
    pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, HEIGHT_FOR_TOP_SCROLLVIEW - 10,WIDTH_FOR_SCREEN , 15)];
    //指定pageControl相关参数
    pageControl.numberOfPages = 4;
//    pageControl.backgroundColor = [UIColor clearColor];
    [pageControl addTarget:self action:@selector(pageControlClick:) forControlEvents:UIControlEventTouchUpInside];//设置分页指示器点击方法
    [headerView addSubview:pageControl];
    

方法

//分页指示器可以根据需要设置只显示需要的部分,前后两个画面不设置
- (void)change:(UIButton *)sender
{
    
    [topScrollView setContentOffset:CGPointMake(WIDTH_FOR_SCREEN + topScrollView.contentOffset.x, 0) animated:YES];
//此处可根据需要手动设置分页指示器
/*    
    int index = fabs(scrollView.contentOffset.x/LHQSCREEN_W);
    self.figurePageControl.currentPage = index;
*/
}


- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView.contentOffset.x == 5 * WIDTH_FOR_SCREEN) {
        [scrollView setContentOffset:CGPointMake(WIDTH_FOR_SCREEN, 0) animated:NO];
    }
}


-(void)pageControlClick:(UIPageControl *)sender
{
    NSLog(@"%ld",sender.currentPage);
    //通过offset偏移量来修改当前滚动视图的滚动位置
    [topScrollView setContentOffset:CGPointMake(WIDTH_FOR_SCREEN * sender.currentPage, 0) animated:YES];
    
}

交互

scrollView上加载scrollView,防止触摸事件干扰

使用setExclusiveTouch方法,可以达到同一界面上多个控件接受事件时的排他性

常用方法备注:


#define HEIGHT_FOR_SCREEN [UIScreen mainScreen].bounds.size.height
#define WIDTH_FOR_SCREEN [UIScreen mainScreen].bounds.size.width
//协议:<UIScrollViewDelegate>

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