SwiftUI:不用新建XCode工程，来运行一个Mac APP

在objc.io 看到一个好玩的东西，大家可以试试
点击原文链接查看地址
考虑到可能大家访问不到，我在下面贴出来了

import Cocoa
import SwiftUI

NSApplication.shared.run {
    VStack {
        Text("Hello, World")
            .padding()
            .background(Capsule().fill(Color.blue))
            .padding()
    }
    .frame(maxWidth: .infinity, maxHeight: .infinity)
}

extension NSApplication {
    public func run(@ViewBuilder view: () -> V) {
        let appDelegate = AppDelegate(view())
        NSApp.setActivationPolicy(.regular)
        mainMenu = customMenu
        delegate = appDelegate
        run()
    }
}

extension NSApplication {
    var customMenu: NSMenu {
        let appMenu = NSMenuItem()
        appMenu.submenu = NSMenu()
        let appName = ProcessInfo.processInfo.processName
        appMenu.submenu?.addItem(NSMenuItem(title: "About \(appName)", action: #selector(NSApplication.orderFrontStandardAboutPanel(_:)), keyEquivalent: ""))
        appMenu.submenu?.addItem(NSMenuItem.separator())
        let services = NSMenuItem(title: "Services", action: nil, keyEquivalent: "")
        self.servicesMenu = NSMenu()
        services.submenu = self.servicesMenu
        appMenu.submenu?.addItem(services)
        appMenu.submenu?.addItem(NSMenuItem.separator())
        appMenu.submenu?.addItem(NSMenuItem(title: "Hide \(appName)", action: #selector(NSApplication.hide(_:)), keyEquivalent: "h"))
        let hideOthers = NSMenuItem(title: "Hide Others", action: #selector(NSApplication.hideOtherApplications(_:)), keyEquivalent: "h")
        hideOthers.keyEquivalentModifierMask = [.command, .option]
        appMenu.submenu?.addItem(hideOthers)
        appMenu.submenu?.addItem(NSMenuItem(title: "Show All", action: #selector(NSApplication.unhideAllApplications(_:)), keyEquivalent: ""))
        appMenu.submenu?.addItem(NSMenuItem.separator())
        appMenu.submenu?.addItem(NSMenuItem(title: "Quit \(appName)", action: #selector(NSApplication.terminate(_:)), keyEquivalent: "q"))
        
        let windowMenu = NSMenuItem()
        windowMenu.submenu = NSMenu(title: "Window")
        windowMenu.submenu?.addItem(NSMenuItem(title: "Minmize", action: #selector(NSWindow.miniaturize(_:)), keyEquivalent: "m"))
        windowMenu.submenu?.addItem(NSMenuItem(title: "Zoom", action: #selector(NSWindow.performZoom(_:)), keyEquivalent: ""))
        windowMenu.submenu?.addItem(NSMenuItem.separator())
        windowMenu.submenu?.addItem(NSMenuItem(title: "Show All", action: #selector(NSApplication.arrangeInFront(_:)), keyEquivalent: "m"))
        
        let mainMenu = NSMenu(title: "Main Menu")
        mainMenu.addItem(appMenu)
        mainMenu.addItem(windowMenu)
        return mainMenu
    }
}

class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate {
    init(_ contentView: V) {
        self.contentView = contentView
        
    }
    var window: NSWindow!
    var hostingView: NSView?
    var contentView: V
    
    func applicationDidFinishLaunching(_ notification: Notification) {
        window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 480, height: 300),
            styleMask: [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView],
            backing: .buffered, defer: false)
        window.center()
        window.setFrameAutosaveName("Main Window")
        hostingView = NSHostingView(rootView: contentView)
        window.contentView = hostingView
        window.makeKeyAndOrderFront(nil)
        window.delegate = self
        NSApp.activate(ignoringOtherApps: true)
    }
}

然后 在终端运行 swift boilerplate.swift 你就会看到一个Mac APP运行起来了

喜欢的朋友可以关注我的公众号

iOS_DevTips