如何以编程方式滚动UIScrollVIew

Question

我想滚动我的UIScrollView(水平).但是当按下按钮时,它会进入滚动视图的最左侧.我想滚动它3,4像素,当我再次按它时滚动另一个3,4像素

- (IBAction)leftScroll:(id)sender
{
    CGPoint pt;
    pt.x = 1;
    pt.y = 0;
    UIScrollView *sv = (UIScrollView *)[self.view viewWithTag:5];
    [sv setContentOffset:pt animated:YES];         
}

提前感谢您的回答

Answer 1

尝试并手动设置新位置.

Objective-C的

  float width = CGRectGetWidth(scrollView.frame);
  float height = CGRectGetHeight(scrollView.frame);
  float newPosition = scrollView.contentOffset.x+width; 
  CGRect toVisible = CGRectMake(newPosition, 0, width, height);

 [scrollView scrollRectToVisible:toVisible animated:YES];

斯威夫特4

let scrollView = UIScrollView()
let width: CGFloat = scrollView.frame.size.width
let height: CGFloat = scrollView.frame.size.height
let newPosition: CGFloat = scrollView.contentOffset.x + width
let toVisible: CGRect = CGRect(x: newPosition, y: 0, width: width,   height: height)

scrollView.scrollRectToVisible(toVisible, animated: true)

Answer 2

你可以使用[scrollView setContentOffset:CGPointMake(x, y) animated:YES];方法.如果您的scrollView水平滚动,则需要相应地设置x值,否则为y值.