IOS UIScrollView——简单示例

头文件：

@interface STScrollViewController ()<UIScrollViewDelegate>{    @private    UIScrollView *mScrollView;    // 记录view drag的位置    CGPoint offset;    // 判断是否结束drag    BOOL endDragging;}@end

类文件：

- (void)viewDidLoad {    [super viewDidLoad];    endDragging = NO;    mScrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    mScrollView.backgroundColor = [UIColor redColor];    mScrollView.delegate = self;    // 设置scrollview显示内容大小    mScrollView.contentSize = mScrollView.frame.size;    // 多屏时，是否分页显示    mScrollView.pagingEnabled = YES;    // 设置滚动条的属性    mScrollView.alwaysBounceHorizontal = YES;    mScrollView.alwaysBounceVertical = YES;    mScrollView.showsHorizontalScrollIndicator = YES;    mScrollView.showsVerticalScrollIndicator = YES;    // 设置混动条颜色风格    mScrollView.indicatorStyle = UIScrollViewIndicatorStyleDefault;    [self.view addSubview:mScrollView];    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 200, 320, 100)];    label.backgroundColor = [UIColor yellowColor];    label.text = @"Test for scrolleview";    [mScrollView addSubview:label];}

在UIScrollView的代理回调中实现了拖动效果：

// scrollView 已经滑动- (void)scrollViewDidScroll:(UIScrollView *)scrollView{    NSLog(@"scrollViewDidScroll");    if (endDragging) {        mScrollView.contentOffset = offset;    }  }// scrollView 开始拖动- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    NSLog(@"scrollViewWillBeginDragging");    endDragging = NO;}// scrollView 结束拖动- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{    offset = scrollView.contentOffset;    endDragging = YES;    NSLog(@"scrollViewDidEndDragging offset x= %f  y=%f",offset.x,offset.y);  }

UIScrollView的一些属性：

UIScrollViewDelegate的一些回调函数：