UIScrollView

1.设置scrollView的滚动范围
    self.scrollView.contentSize = CGSizeMake(self.iconView.frame.size.width , self.iconView.frame.size.height);
//    2.设置偏移量
//    self.scrollView.contentOffset = CGPointMake(200, 200);
    
//    3.增加scrollView上下左右的滚动范围
    self.scrollView.contentInset = UIEdgeInsetsMake(100, 50, 30, 70);

电台



//    1.设置滚动范围
      CGFloat maxY =  CGRectGetMaxY(self.lastBtn.frame);
        self.scrollView.contentSize = CGSizeMake(0, maxY);
//    2.设置偏移量
    self.scrollView.contentOffset = CGPointMake(0, -64);
//    3.设置额外滚动的范围
    self.scrollView.contentInset = UIEdgeInsetsMake(64, 0, 44, 0);

 用来监听到scrollView开始滚动调用
 *
 *  @param scrollView <#scrollView description#>
 */
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
    
    NSLog(@"我开始拖拽");
}

/**
 *  表示拖动scrollView过程
 *
 *  @param scrollView <#scrollView description#>
 */
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    NSLog(@"%f",scrollView.contentOffset.x);
    
    
    
}
/**
 *  结束拖拽
 *
 *  @param scrollView <#scrollView description#>
 *  @param decelerate <#decelerate description#>
 */
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    NSLog(@"结束拖拽");
    
    
}

@property (weak, nonatomic) IBOutlet UIImageView *iconView;   //连接按钮
**
 *  告诉我们捏合缩放哪个控件
 */

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    return self.iconView;
    
   }