xcode playground 实时交互UIView

源:http://help.apple.com/xcode/mac/8.0/#/dev5d9411fd2

意译，务较真

假设你已经创建好了playground文件

添加以下代码

import UIKit
import PlaygroundSupport //引入<code>Playground</code>支持

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let view:UIView = UIView(frame: CGRect.zero)
        self.view.addSubview(view)
        UIView.animate(withDuration: 1, animations: {
            view.backgroundColor = UIColor.red
            view.frame = self.view.bounds
        }) { (b) in
            view.backgroundColor = UIColor.yellow
        }
    }
}

let myView = ViewController()
PlaygroundPage.current.liveView = myView //设置playground 的liveView为myView

至此大部分工作已经完成了

下面，只需要点按Xcode菜单

     View > Assistant Editor > Show Assistant Editor