ios 添加scrollView滚动到一定程度的方法。

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//- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset

//{

//    SJBLog(@"====%f,,,%f",velocity.y,scrollView.contentOffset.y);

//    if (velocity.y > 0.09f) {

//velocity.y 是滑动的速率。。。。

//        

//    }else if (velocity.y < - 0.09f ){

 

//}

 

 

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{

    SJBLog(@"====,,,%f,,%f",scrollView.contentOffset.y,self.mainTable.contentSize.height - (kScreenHeight - kNavigationBarHeight - kTabbarHeight) );

    if (scrollView.contentOffset.y < - 50) {

        //向下拉到50松手后，

    }elseif (scrollView.contentOffset.y -(self.mainTable.contentSize.height - (kScreenHeight - kNavigationBarHeight - kTabbarHeight))>50){

       //向上拉到50松手后，

    }

 

 

}