ios - UIScrollView 的自定义分页
<p><p>我有一个 UIScrollView 可以水平滚动并启用分页。有没有办法改变 ScrollView 的分页,使其在 ScrollView 的整个长度中捕捉到一半。我添加了显示我正在寻找的图片。</p>
<p> <a href="/image/CPogy.png" rel="noreferrer noopener nofollow"><img src="/image/CPogy.png" alt="Page 1"/></a> </p>
<p> <a href="/image/kHAEJ.png" rel="noreferrer noopener nofollow"><img src="/image/kHAEJ.png" alt="Page 2"/></a> </p>
<p> <a href="/image/LY4Ag.png" rel="noreferrer noopener nofollow"><img src="/image/LY4Ag.png" alt="Page 3"/></a> </p>
<pre><code>override func viewDidLoad() {
super.viewDidLoad()
let scrollView = UIScrollView()
scrollView.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height)
scrollView.contentSize = CGSize(width: self.view.frame.size.width * 2, height: self.view.frame.size.height)
scrollView.isPagingEnabled = true
self.view.addSubview(scrollView)
let view1 = UIView()
view1.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width / 2, height: self.view.frame.size.height)
view1.backgroundColor = UIColor.purple
scrollView.addSubview(view1)
let view2 = UIView()
view2.frame = CGRect(x: self.view.frame.size.width / 2, y: 0, width: self.view.frame.size.width / 2, height: self.view.frame.size.height)
view2.backgroundColor = UIColor.green
scrollView.addSubview(view2)
let view3 = UIView()
view3.frame = CGRect(x: self.view.frame.size.width, y: 0, width: self.view.frame.size.width / 2, height: self.view.frame.size.height)
view3.backgroundColor = UIColor.yellow
scrollView.addSubview(view3)
let view4 = UIView()
view4.frame = CGRect(x: self.view.frame.size.width + self.view.frame.size.width / 2, y: 0, width: self.view.frame.size.width / 2, height: self.view.frame.size.height)
view4.backgroundColor = UIColor.red
scrollView.addSubview(view4)
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您可以为 ScrollView 设置委托(delegate)并实现 <code>UIScrollViewDelegate</code> 方法之一:</p>
<pre><code>func scrollViewWillEndDragging(
_ scrollView: UIScrollView,
withVelocity velocity: CGPoint,
targetContentOffset: UnsafeMutablePointer<CGPoint>
)
</code></pre>
<p>当您收到此调用时,您需要执行一些自定义逻辑。具体来说,您将检查 <code>targetContentOffset</code> 以及 <code>velocity</code> 以分别查看 scrollView 预期停止的位置以及用户拖动的方向。然后将 <code>targetContentOffset</code> 更改为它应该实际停止的新位置。</p>
<p>在您的情况下,新的 <code>targetContentOffset</code> 的 <code>x</code> 值将是偶数页的倍数。显然,如果您有奇数页,则必须考虑最后一页的偏移量并做一些不同的事情。</p>
<p>您可能还需要禁用默认的 <code>UIScrollView</code> 分页并自己处理所有分页,因为您的自定义行为与默认分页行为冲突。</p></p>
<p style="font-size: 20px;">关于ios - UIScrollView 的自定义分页,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/41496659/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/41496659/
</a>
</p>
页:
[1]