UIScrollView的基本用法

//初始化UIScrollView    

UIScrollView *sc = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];   

 sc.backgroundColor = [UIColor orangeColor];UIImage *image = [UIImage imageNamed:@"death"];   

 UIImageView *iv = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, image.size.width, image.size.height)];    

iv.image = image;        

//滚动范围: contentSize --> 要比scrollView的size大    

//滚动范围一定要比scrollcview的本身大   

 sc.contentSize = image.size;       

 //偏移量:  contentOffset --> 滚动到某一个位置(点)

//    sc.contentOffset = CGPointMake(self.view.frame.size.width, 0);        

//bounces - 弹簧效果

//    sc.bounces = NO;        

/**    

 alwaysBounceVertical - 一定会出现弹簧效果 - 纵向    

 alwaysBounceHorizontal - 横向    */    

sc.alwaysBounceVertical = YES;    

sc.alwaysBounceHorizontal = NO;            

//关闭或者开启滚动提示器   

 //showsVeVrticalScrollIndicator  - 纵向    

//showsHorizontalScrollIndicator - 横向   

 sc.showsVerticalScrollIndicator = NO;    

sc.showsHorizontalScrollIndicator = NO;            

//是否进行滚动

//    sc.scrollEnabled = NO;    

//设置代理：

@interface ViewController ()<UIScrollViewDelegate>

sc.delegate = self;

//1.SCrollView的放大缩小设定

//min  - 最小

//max  - 最大

//scale 放大缩小倍数 ， 默认是1

sc.minimumZoomScale = 0.3;

sc.maximumZoomScale = 3;

// 返回一个放大或者缩小的视图

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{    }

// 开始放大或者缩小

- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view{    }

// 缩放结束时

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale{    }

// 视图已经放大或缩小

- (void)scrollViewDidZoom:(UIScrollView *)scrollView{NSLog(@"scrollViewDidScrollToTop");} */

// 是否支持滑动至顶部

- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView{    return YES;}

// 滑动到顶部时调用该方法

- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{    NSLog(@"scrollViewDidScrollToTop");}

// scrollView 已经滑动

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{    NSLog(@"scrollViewDidScroll");}

// scrollView 开始拖动

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    NSLog(@"scrollViewWillBeginDragging");}

// scrollView 结束拖动

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{    NSLog(@"scrollViewDidEndDragging");}

// scrollView 开始减速（以下两个方法注意与以上两个方法加以区别）

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{    NSLog(@"scrollViewWillBeginDecelerating");}

// scrollview 减速停止

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{  NSLog(@"scrollViewDidEndDecelerating"); }