UIScrollView常用属性和代理方法

UIScrollView常用属性.

    //在设置最大滚动距离时 一般用到最后一个控件的最大Y值 或 X值 CGRectGetMaxX
    //点进去浏览,分别有最大最小x,最大最小y,最大最小中点(CGRectMidX ....MidY)
    CGFloat maxY = CGRectGetMaxY(self.lastBtn.frame) + 10;
    //设置滚动区域,x=0时只能上下滚动,y=0时左右滚动
    self.scrollView.contentSize = CGSizeMake(0, maxY);
    self.scrollView.delegate = self;
    //设置额外的滚动区域{top, left, bottom, right}
    self.scrollView.contentInset = UIEdgeInsetsMake(64, 0, 44, 0);
    //设置默认滚动位置(启动时停留在哪个位置)
    self.scrollView.contentOffset = CGPointMake(0, -64);

代理方法的使用解释

//只要滚动了就会触发
- (void)scrollViewDidScroll:(UIScrollView *)scrollView;   
{
//     NSLog(@" scrollViewDidScroll");
        NSLog(@"ContentOffset  x is  %f,yis %f",scrollView.contentOffset.x,scrollView.contentOffset.y);
}
//开始拖拽视图
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;   
{
   NSLog(@"scrollViewWillBeginDragging");
}
//完成拖拽
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate; 
{
   NSLog(@"scrollViewDidEndDragging");
}
//将开始降速时
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;   
{
   NSLog(@"scrollViewWillBeginDecelerating");
}

//减速停止了时执行，手触摸时执行
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;   
{
   NSLog(@"scrollViewDidEndDecelerating");
}
//滚动动画停止时执行,代码改变时出发,也就是setContentOffset改变时
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;
{
   NSLog(@"scrollViewDidEndScrollingAnimation");
}
//设置放大缩小的视图，要是uiscrollview的subview
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;   
{
   NSLog(@"viewForZoomingInScrollView");
    return viewA;//这里返回一个view.告诉代理将要对哪个view操作
}
//完成放大缩小时调用
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale; 
{
    viewA.frame=CGRectMake(50,0, 100, 400);
   NSLog(@"scale between minimum and maximum. called after any 'bounce' animations");
}// scale between minimum and maximum. called after any 'bounce' animations

//如果你不是完全滚动到滚轴视图的顶部，你可以轻点状态栏，那个可视的滚轴视图会一直滚动到顶部，那是默认行为，你可以通过该方法返回NO来关闭它
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;   
{
    NSLog(@"scrollViewShouldScrollToTop");
   return YES;
}

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