- (void)viewDidLoad {[super viewDidLoad];_scrollView.backgroundColor = [UIColor redColor];//设置contentSize（必须设置）_scrollView.contentSize = CGSizeMake(400, 667);//偏移量_scrollView.contentOffset = CGPointMake(100, 0);//contentInset(在原有的基础上调整内容滚动区域的大小)//_scrollView.contentInset = UIEdgeInsetsMake(-100, 0, 0, 0);//锁定方向(当系统识别滚动方向的时候，会把另外一个方向锁定，如果识别不了，就不锁定方向)_scrollView.directionalLockEnabled = YES;//反弹效果(默认为yes)_scrollView.bounces = YES;//默认是no，假如是yes并且bounces是yes,甚至如果内容大小小于bounds的时候，允许垂直拖动_scrollView.alwaysBounceVertical = YES;//分页（默认no）_scrollView.pagingEnabled = YES;//滚动(默认yes允许滚动)_scrollView.scrollEnabled = YES;//滚动条//showsHorizontalScrollIndicator默认yes 显示_scrollView.showsHorizontalScrollIndicator = NO;//滚动条滚动的范围(垂直滚动条滚动范围上下各缩小50)_scrollView.scrollIndicatorInsets = UIEdgeInsetsMake(50, 0, 50, 0);//样式_scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;// Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidLoad {[super viewDidLoad];//创建并添加scrollViewUIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(100, 200, 200, 300)];[self.view addSubview:scrollView];scrollView.backgroundColor = [UIColor redColor];//设置内容视图的大小scrollView.contentSize = CGSizeMake(375, 667);//设置内容视图UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 375, 667)];imageView.image = [UIImage imageNamed:@"new_feature_1"];[scrollView addSubview:imageView];_imageView = imageView;//设置代理scrollView.delegate = self;//[self performSelector:@selector(changeScrollViewContentOffSet:) withObject:scrollView afterDelay:3];//设置缩放内容视图的缩放比例范围scrollView.minimumZoomScale = 0.5;scrollView.maximumZoomScale = 1.5;//当缩放比例超出范围之后，是否有反弹效果（no:不会超出范围，yes:超出范围之后反弹）scrollView.bouncesZoom = YES;//属性设置滚动至顶部//scrollView.scrollsToTop = YES;// Do any additional setup after loading the view, typically from a nib.
}-(void)changeScrollViewContentOffSet:(UIScrollView *)scrollView{[scrollView setContentOffset:CGPointMake(0, 300) animated:YES];
}#if 0
#pragma mark -UIScrollViewDelegate 滚动
//当scrollView滚动的时候，不停调用（可以监听scrollView的contentOffset）
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{//NSLog(@"%@",NSStringFromCGPoint(scrollView.contentOffset));//NSLog(@"decelerating：%d",scrollView.decelerating);//NSLog(@"dragging：%d",scrollView.dragging);//NSLog(@"tracking:%d",scrollView.tracking);NSLog(@"%s",__func__);
}//开始拖动的时候调用
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{//NSLog(@"tracking:%d",scrollView.tracking);NSLog(@"%s",__func__);
}// called on finger up if the user dragged. velocity is in points/millisecond. targetContentOffset may be changed to adjust where the scroll view comes to rest
//将要结束拖动
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
//    NSLog(@"velocity:%@",NSStringFromCGPoint(velocity));
//    NSLog(@"targetContentOffset:%@",NSStringFromCGPoint(*targetContentOffset));//强制设置scrollView的偏移量//*targetContentOffset = CGPointMake(0, 200);NSLog(@"%s",__func__);
}// 已经结束拖动
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{//NSLog(@"dragging：%d",scrollView.dragging);NSLog(@"%s",__func__);
}//将要开始减速
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{//NSLog(@"decelerating：%d",scrollView.decelerating);NSLog(@"%s",__func__);
}//减速完成（停止）
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{//NSLog(@"contentOffset:%@",NSStringFromCGPoint(scrollView.contentOffset));NSLog(@"%s",__func__);
}// called when setContentOffset/scrollRectVisible:animated: finishes. not called if not animating
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{NSLog(@"%s",__func__);
}
#endif
#pragma mark -UIScrollViewDelegate(缩放)
//指定缩放视图
- (nullable UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{NSLog(@"%s,zooming:%d",__func__,scrollView.zooming);return _imageView;
}
//缩放之前调用
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(nullable UIView *)view {NSLog(@"%s,zooming:%d",__func__,scrollView.zooming);
}
//完成缩放
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(nullable UIView *)view atScale:(CGFloat)scale{NSLog(@"%s,zooming:%d",__func__,scrollView.zooming);
}
//缩放时调用
- (void)scrollViewDidZoom:(UIScrollView *)scrollView{NSLog(@"%s,zooming:%d",__func__,scrollView.zooming);
}#pragma mark -UIScrollViewDelegate(滚动至顶部)
//允许滚动至顶部
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView{return YES;
}//已经滚动至顶部
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{NSLog(@"加载新数据，刷新界面");
}