如何在 Playground 的 UIScrollView 中滚动?

How do you scroll in a UIScrollView in the Playground?

你真的可以在 Playground 的 UIScrollView 中滚动吗?在下面的示例中,我希望能够向下滚动并查看标签。

import UIKit
import XCPlayground

let contentView = UIView(frame: CGRectMake(0, 0, 200, 200))
contentView.backgroundColor = UIColor.yellowColor()

let label = UILabel(frame: CGRectMake(0, 120, 20, 20))
label.text = "a"

contentView.addSubview(label)

let scrollView = UIScrollView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
scrollView.contentSize = CGSize(width: 200, height: 200)
scrollView.addSubview(contentView)
scrollView.flashScrollIndicators()

XCPlaygroundPage.currentPage.liveView = scrollView

编辑:7.3 于 2016 年 3 月 21 日发布到 App Store。最好下载一下there.

正如 Eric 所说,在 Xcode 7.3 beta 3 中添加了与 playgrounds 的交互。您可以阅读完整的公告 here. Since Xcode 7.3 is still in beta, you'll need to download it from here