UIScrollView&nbsp;UIPageViewControlle…-阿里云开发者社区

1、UIScorollView 是ios中提供的滑动控件，用来解决当内容区域大于scorollView可视区域时，可以通过滑动的方式查看整个内容区域，UIScorollView 的滑动控件的基类，后期药学的UITableView(表视图),内部实现的原理是修改视图的bounds

//1.创建对象
UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(20, 20, kScreenWidth - 20 * 2, kScreenHeight - 20 *2)];
//2.配置属性

//    scrollView.backgroundColor = [UIColor redColor];
    //2.1 设置内容区域的大小
    scrollView.contentSize = CGSizeMake(500, 1000);
    //2.2 修改内容区域的偏移量
    //x变大，往左偏移，y变大往上偏移 1
//    scrollView.contentOffset = CGPointMake(140, 400);
    //2.3 是否显示滚动指示条
    scrollView.showsHorizontalScrollIndicator = NO;//默认为YES
    scrollView.showsVerticalScrollIndicator = NO;//默认为YES
    //2.4 修改滚动指示条的样式
//    scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
    //2.5 设置scrollView 能否滚动
    scrollView.scrollEnabled = YES;//默认为YES
    //2.6 设置方向锁，设置滑动时只能从一个方向滚动
    scrollView.directionalLockEnabled = NO;//默认为NO
    //2.7 设置是否整屏滚动

scrollView.pagingEnabled = YES;//默认为NO

UIScrollView <wbr>UIPageViewController <wbr>UI_07

//2.8 设置当滑动到屏幕边缘的时候是否出现反弹效果

scrollView.bounces = YES;//默认为YES

//2.9 设置当内容区域等于或小于可视区域时，依然具有边界反弹效果

//水平方向

scrollView.alwaysBounceHorizontal = YES;//默认为NO

//垂直方向

scrollView.alwaysBounceVertical = YES;//默认为NO
//2.10 设置点击状态栏，scrollView 是否回到顶部，此时y轴的偏移量是0

scrollView.scrollsToTop = YES;//默认为YES

//2.11 scrollView 的代理属性
//self指试图控制器对象

scrollView.delegate = self;

//2.12 设置scrollView的缩放比例
scrollView.minimumZoomScale = 0.5;

scrollView.maximumZoomScale = 3.0;

  UIImage *image = [UIImage imageNamed: @"4.JPG"];
    UIImageView *imageView = [[UIImageView alloc]initWithImage:image];
    imageView.tag = 101;
    imageView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);
    //添加到父视图
    [scrollView addSubview:imageView];
    [self.view addSubview:scrollView];
    //释放所有权
    [scrollView release];

}

——————————————————————————-——————

scrollView 的代理属性的13个方法及用途

//触发时机：ScrollView 将要开始拖拽idea时候触发(此时手指刚刚触摸到scrollView的时候)
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{

    NSLog(@"开始拖拽了没？");
}

//触发时机：ScrollView 将要结束拖拽的时候触发
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset NS_AVAILABLE_IOS(5_0){
    NSLog(@"拖拽结束了没？");

}

//触发时机：ScrollView 已经结束拖拽的时候触发
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    NSLog(@"结束了没？好快啊！");
    //在此方法中能拿到contenOfSet的偏移量
}

//触发时机：将要减速的时候触发(此方法不一定触发，匀速不一定触发)
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
    NSLog(@"减速了么？");
}

//触发时机：已经结束减速的时候触发(此方法不一定触发，上面的减速方法不触发，这个结束减速的方法就不会触发)
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    NSLog(@"加速完了吗？");
    //一般在这个方法中获取scrollView的偏移量，或者设置scrollView的偏移量

// scrollView.contentOffset = CGPointZero;

//    [scrollView setContentOffset:CGPointZero animated:YES];
}

//触发时机：scrollView结束减速并且必须有动画效果才会触发(必须要有动画效果偶)
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
    NSLog(@"有动画吗");
}

//触发时机，返回缩放后的视图，但是只能返回scrollView（内容）上的子视图
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    return [scrollView viewWithTag:101];
}

//触发时机：开始缩放的时候触发
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view NS_AVAILABLE_IOS(3_2){
    NSLog(@"开始缩放了吗");
}
//触发时机：结束缩放的时候触发
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
    NSLog(@"结束缩放了吗");
}

//触发时机：点击状态栏，调用该方法，该方法能实现的前提是scrollToTop的属性是YES
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView{
    return YES;
}

//触发时机：scrollView 已经回到顶部了
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{

}

总结：scrollView的使用技巧
使用scrollViewDidZoom: 实时修改自身视图的大小
使用scrollViewDidEndDecelerating: 获取contentOfSet

==============================================================

LaunchViewController.m

#import "LaunchViewController.h"
#import "PageViewController.h"
//图片个数
#define kImageCount 6
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height
@interface LaunchViewController ()<</span>UIScrollViewDelegate>
//定义属性方便使用
@property(nonatomic,retain)UIScrollView *scrollView;
@property(nonatomic,retain)UIPageControl *pageControl;
@end

@implementation LaunchViewController
- (void)dealloc{
    _scrollView = nil;
    _pageControl = nil;
    [super dealloc];
}

- (void)viewDidLoad {
    [super viewDidLoad];

        //再添加scrollView
    [self layoutScrollView];
    //先添加pageControl
    [self layoutPageControl];

}

//布局scrollView
- (void)layoutScrollView{
    self.scrollView = [[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].bounds];
    //设置内容页的大小
    self.scrollView.contentSize = CGSizeMake(kImageCount * kScreenWidth, kScreenHeight);
    //隐藏水平指示条
    self.scrollView.showsHorizontalScrollIndicator = NO;
    //整屏滑动
    self.scrollView.pagingEnabled = YES;
    //制定代理
    self.scrollView.delegate = self;

    //添加图片
    for (int i = 0; i <</span> kImageCount; i ++ ) {
        UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(i * kScreenWidth, 0, kScreenWidth, kScreenHeight)];
        //图片名
        NSString *name = [NSString stringWithFormat:@"v6_guide_%d",i + 1];
        //初始化UIImage 对象
        UIImage *image = [UIImage imageNamed:name];
        imageView.image = image;
        [self.scrollView addSubview:imageView];

        [imageView release];

        //添加手势
        if (kImageCount - 1 == i) {
            UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap: )];

[imageView addGestureRecognizer:tap];

[tap release];

//打开用户交互

imageView.userInteractionEnabled = YES;

        }
    }

    self.scrollView.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:self.scrollView];
    [self.scrollView release];

}

PageViewController.m

#pragma mark pageControl的实现
- (void)layoutPageControl{
    _pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, kScreenHeight - 60, kScreenWidth, 60)];
    _pageControl.numberOfPages = kImageCount;
    //配置点的颜色
    _pageControl.currentPageIndicatorTintColor = [UIColor redColor];
    //配置其他点的颜色

_pageControl.pageIndicatorTintColor = [UIColor greenColor];

//给pageControl 关联事件

[_pageControl addTarget:self action:@selector(handlePage : ) forControlEvents:(UIControlEventValueChanged)];

[self.view addSubview:_pageControl];

[_pageControl release];

}

#pragma mark 是轻拍手势的实现
- (void)handleTap : (UITapGestureRecognizer *)tap{
    NSLog(@"轻拍了嘛？");
    //是一个单例，可以实现数据持久化，当用户点击到最后一张图片时，引导图启动结束，此时在用户偏好中做一个标记，并把这个标记存储起来
    NSUserDefaults *user = [NSUserDefaults standardUserDefaults];

    [user setBool:YES forKey:@"daociyiyou"];
    //赋值之后立即同步,作用是将事件标记的值存储起来

[user synchronize];

    //实现点击最后一张图片进入用户进入用户界面
    PageViewController *pageVC = [[PageViewController alloc]init];
    //更换当前的window 的根视图控制器，将pageVC设置为主界面

    //取出当前的应用程序对象
    [UIApplication sharedApplication].keyWindow.rootViewController = pageVC;

    [pageVC release];

}

#pragma mark scrollView的实现
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    //求出scrollView内容在x轴偏移量
    CGFloat x = _scrollView.contentOffset.x;
    //求出pageCrontrol对应的下标
    _pageControl.currentPage = x / kScreenWidth;
}

- (void)handlePage : (UIPageControl *)page{

    NSLog(@"%ld",page.currentPage);

    //让_scrollView 跟pageControl 页数的改变而改变

_scrollView.contentOffset = CGPointMake(page.currentPage * kScreenWidth, 0);

}

————————————————————————————————

AppDelegate.m

    //根据判断条件让运行程序启动引导界面
    //获取用户对象，用户对象中存储的是一些有用的偏好设置
    NSUserDefaults *user = [NSUserDefaults standardUserDefaults];

if ([user boolForKey:@"daociyiyou"] != NO) {

// //根视图控制器

self.window.rootViewController = [PageViewController new];

    }else{
        //根视图
        self.window.rootViewController = [LaunchViewController new];
    }
    return YES;

}

最终效果：

本节所需素材下载： http://pan.baidu.com/s/1dD8pMLj

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