iphone常用控件之UIScrollView

@interface ViewController : UIViewController<UIScrollViewDelegate>{    UIScrollView *scrollView;    UIImageView *imageView;    }//.m文件- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    //    CGRect *screenBounds = [[UIScreen mainScreen] bounds];   //返回整个屏幕的边界，包括状态栏所显示的空间    CGRect bounds = [[UIScreen mainScreen] applicationFrame];  //返回屏幕的可显示区域        scrollView = [[UIScrollView alloc] initWithFrame:bounds];    scrollView.delegate = self;   //设置委托//    scrollView.backgroundColor = [UIColor redColor];     imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]];    [scrollView addSubview:imageView];//添加图片    scrollView.contentSize = imageView.frame.size; //设置内容的尺寸大小
 
 //设置是否显示滑动条
 scrollView.showsHorizontalScrollIndicator=NO;
 scrollView.showsVerticalScrollIndicator=NO;

//pagingEnabled属性，页面翻转    scrollView.pagingEnabled = NO;

//缩放的最大最小值    scrollView.minimumZoomScale = 0.25;    scrollView.maximumZoomScale = 2.5;        //indicatorStyle指定滚动指示条类型    scrollView.indicatorStyle = UIScrollViewIndicatorStyleDefault; //滚动指示器类型，默认白边界上绘制黑色滚动条 3种        //directionalLockEnabled属性    scrollView.directionalLockEnabled = YES; //设置为YES将滚动锁定在一个方向上进行。        //bounces属性，YES时滚动到边缘可超为超出界面外一点然后弹回原位    scrollView.bounces = NO; //NO时滚动不会超出可见范围        //bouncesZoom属性，类似bounds 指的用户的缩放//    scrollView.bouncesZoom = NO; //NO时缩放不可超出最大最小缩放范围        //pagingEnabled属性，页面翻转    scrollView.pagingEnabled = NO;     //    scrollView.contentOffset = YES;        self.view = scrollView;}//响应缩放方法-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{    return imageView;}/*********代理方法*********///在视图滚动时接到通知，包括一个指向被滚动视图的指针，从中可读取contentOffset属性已确定其滚动到的位置,常用-(void)scrollViewDidScroll:(UIScrollView *)scrollView{    }//拖动之前收到通知，可读取contentOffset-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{}//用户抬起手指时得到通知，还会得到一个布尔值指明在报告滚动视图最后位置之前，手否需要进行减速-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{    }//当用户抬起手指为滚动视图需要继续滚动时收到通知，可读取contentOffset属性，可判断用户抬起手指前最后一次滚动到的位置，但不是最终位置-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{    }//当前一个提到的减速完毕、滚动视图停止移动时会得到通知，收到这个通知的时刻，滚动视图contentOffset属性会反映出滚动条最终停止位置-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    }//用户进行缩放时会得到通知，缩放比例表示为一个浮点数，作为参数传递-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale{    }//当用户点触iPhone的状态条时滚动视图代理可以决定视图是否应滚定回到开头-(BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView{    }-(void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{    }