scrollviewdelegate

- (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];

}

#if0#pragmamark -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#pragmamark -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);

}

#pragmamark -UIScrollViewDelegate(滚动至顶部)//允许滚动至顶部

- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView{returnYES;

}

//已经滚动至顶部

- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{

NSLog(@"加载新数据，刷新界面");

}