UIScrollView

1.建立一個滾動視圖（在內容的展現上，相似於瀏覽器）

   UIScrollView *sv = [[UIScrollView alloc] initWithFrame:CGRectMake(,,,)];

2.設置可展現內容的size

   sv.contentSize = CGSizeMake(,);

3.設置彈簧效果

   sv.bounces = NO;

4.設置翻頁效果

   sv.pagintEnabled = YES;

5.設置水平和垂直進度條是否展現

    sv.showsHorizontalScrollIndicator = YES;

    sv.showsVerticaScrollIndicator = NO;

//若是將垂直設爲NO，那麼水平進度條也就不會顯示了

6.是否容許用戶操做sv的滾動

   sv.scrollEnabled = NO;

7.- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

   {

         sv.contentOffset = CGPointMake(,);//設置偏移量（經過代碼設置sv展現的區域）

         [sv setContentOffset:CGPointMake(,) animate:YES];//加動畫設置偏移量

    }

8.設置容許sv裏的子視圖縮放的倍數

    sv.minimumZoomScale = 0.5;

    sv.maximumZoomScale = 2;

9.告訴sv，容許縮放哪個子視圖

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

   {

       return [scrollView.subviews lastObject];

    }

10.當sv被滾動的時候調用

   - (void)scrollViewDidScroll:(UIScrollView *)scrollView

  {

      NSLog(@"===%@",NSStringFromCGPoint(scrollView.contentOffset));
    //將偏移量轉化成字符串，而後打印

   }

11.- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    NSLog(@"開始拖拽");
}

 

12.- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    NSLog(@"結束拖拽");
}

13.- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"開始滑行");
}

14.- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"結束滑行");//最經常使用
}

 

 

15.關掉vc對sv的自動調整

     self.automaticallyAdjustsScrollViewInsets = NO;