UIScrollView

//设置代理

 _scrollView.delegate = self;

UIScrollView基本属性测试##

- (void)testBaseAttributes
{
    //设置能否滚动，默认为YES
    //_scrollView.scrollEnabled = NO;
    //设置边界回弹效果
    //_scrollView.bounces = NO;
    /*滚动指示条风格
     UIScrollViewIndicatorStyleDefault  灰白
     UIScrollViewIndicatorStyleBlack    灰色
     UIScrollViewIndicatorStyleWhite    白色
     */
    _scrollView.indicatorStyle = UIScrollViewIndicatorStyleDefault;
    //是否显示水平滚动指示条
    _scrollView.showsHorizontalScrollIndicator = NO;
    //是否显示垂直滚动指示条
    _scrollView.showsVerticalScrollIndicator = NO;
    //无论内容尺寸多大，都可一直滚动，测试时bounces必须为YES
    //水平方向一直可以滚动
    _scrollView.alwaysBounceHorizontal = YES;
    //垂直方向一直可以滚动
    _scrollView.alwaysBounceVertical = YES;

    /*设置松手后减速的加速度
     UIScrollViewDecelerationRateNormal 正常
     UIScrollViewDecelerationRateFast   快速
     */
    //_scrollView.decelerationRate = UIScrollViewDecelerationRateFast;

    //点击状态栏自动滚动到顶部，默认为YES
    //_scrollView.scrollsToTop = NO;

    //设置内容偏移量，非常重要
    //无动画版本
    _scrollView.contentOffset = CGPointMake(300, 300);
    //延时5s，调用动画设置偏移量到(0,0)
    [self performSelector:@selector(setContentOffsetToZero) withObject:nil afterDelay:5];

    //设置是否按页滚动，默认为NO
    _scrollView.pagingEnabled = YES;

    //缩放相关，必须再指定缩放的视图才能缩放，设置代理方法
    _scrollView.minimumZoomScale = 0.5;
    _scrollView.maximumZoomScale = 2.0;
    //添加双击缩放手势
    UITapGestureRecognizer *tgr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(zoomHandle:)];
    tgr.numberOfTapsRequired = 2;
    [_scrollView addGestureRecognizer:tgr];
    [tgr release];
}

//UIScrollview缩放属性
//双击缩放触发的方法

- (void)zoomHandle:(UITapGestureRecognizer *)tgr
{
    CGFloat maximumScale = _scrollView.maximumZoomScale;
    CGFloat currentScale = _scrollView.zoomScale;
    if (currentScale != 1.0) {
        [_scrollView setZoomScale:1.0 animated:YES];
    } else {
        [_scrollView setZoomScale:maximumScale animated:YES];
    }
}

UIScrollView代理相关方法

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    //只要有滚动就会一直调用，不能做耗时操作
    //NSLog(@"滚动...");
}

//使用代码方式，动画版本的修改偏移量，结束时回调
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
{
    NSLog(@"代码方式，动画滚动结束");
}

//指定缩放的视图
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return scrollView.subviews[0];
}

页码指示器基本属性

- (void)setPageControl
{
    _pageControl = [[UIPageControl alloc] init];
    CGSize size = self.view.frame.size;
    _pageControl.frame = CGRectMake(0, size.height-50, size.width, 50);
    //_pageControl.backgroundColor = [UIColor grayColor];
    //设置页码指示小圆点的颜色
    _pageControl.pageIndicatorTintColor = [UIColor greenColor];
    //设置当前页码指示小圆点的颜色
    _pageControl.currentPageIndicatorTintColor = [UIColor blueColor];
    //设置总页数
    _pageControl.numberOfPages = _scrollView.contentSize.width/_scrollView.frame.size.width;
    //添加事件
    [_pageControl addTarget:self action:@selector(changeHandle:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:_pageControl];
}

隐藏状态栏

#pragma mark - 状态栏相关
- (UIStatusBarStyle)preferredStatusBarStyle
{
    return UIStatusBarStyleLightContent;
}
- (BOOL)prefersStatusBarHidden
{
    return _isHiddenStatusBar;
}
- (void)tapGestureHandle
{
    _isHiddenStatusBar = !_isHiddenStatusBar;
    //必须要刷新状态栏才会改变
    [self setNeedsStatusBarAppearanceUpdate];
}

UIScrollview图片复用

说明：三个UIImageView，中间一个UIimageView加在scrollView用于缩放操作，复用的关键在于UIImageView的tag值和image的tag值之间的关联
关键代码如下：

//滑动结束后操作
- (void)autoRefresh
{
    char flag = 0;
    CGSize size = _scrollView.frame.size;

    if (_scrollView.contentOffset.x == 0) {
        //向右滑
        flag = -1;
    } else if (_scrollView.contentOffset.x == 2*size.width) {
        //向左滑
        flag = 1;
    } else {
        return;
    }
    for (UIImageView *view in _imageViews) {
    //重新设置imageView的tag值非常重要
        view.tag = (view.tag+flag+_imgaeNames.count)%_imgaeNames.count;
        [self setImageToImageView:view];
    }
    _scrollView.contentOffset = CGPointMake(size.width, 0);
    //找到中间视图的父视图(小的滚动视图)
    UIScrollView *sv = (UIScrollView *)[_imageViews[1] superview];
    //恢复其缩放比例1.0
    sv.zoomScale = 1.0;

    [self refreshTitle];
}