swift游乐园。创建项目级别的测试

在创建的时候选择

创建后结构

修改代码

MyPlayground

//: A UIKit based Playground for presenting user interfaceimport UIKit
import PlaygroundSupportlet vc &＃61; ViewController1()
let navigationVc &＃61; UINavigationController(rootViewController: vc)// Present the view controller in the Live View window
PlaygroundPage.current.liveView &＃61; navigationVc;


ViewController1

import Foundation
import UIKitpublic class ViewController1:UIViewController{public override func viewDidLoad(){super.viewDidLoad()// Do any additional setup after loading the view.let button &＃61; UIButton(type: .custom)button.frame&＃61;CGRect(x:0,y: 200,width: 300,height: 50)button.setTitle("点击跳转", for: .normal)button.setTitleColor(.white, for: .normal)button.backgroundColor &＃61; .bluebutton.addTarget(self, action: #selector(onButtonClick), for: .touchUpInside)view.addSubview(button)}&＃64;objc func onButtonClick() {navigationController?.pushViewController(ViewController2(), animated: true)}}

ViewController2

import Foundation
import UIKitpublic class ViewController2:UIViewController{public override func viewDidLoad(){super.viewDidLoad()let view &＃61; UIView()view.backgroundColor &＃61; .whitelet label &＃61; UILabel()label.frame &＃61; CGRect(x: 150, y: 200, width: 200, height: 20)label.text &＃61; "Hello World!"label.textColor &＃61; .blackview.addSubview(label)self.view &＃61; view}
}