我试图理解如何在两个不同的视图或函数之间更改变量（var或标签）中的数据。
我是从swiftUi迁移过来的，我曾经在整个应用程序中创建stateobject and accessing the variable through environment variables。但现在可可框架让我有点困惑。
所以我创建了两个视图CustomView1和CustomView2，其中一个包含一个按钮，另一个包含一个标签。因此，当按钮单击时，标签的字符串值应该会更改。
但问题是运行时什么也没有显示。连window都没有出现。
**错误：**无错误
main.swift
import Cocoa
let app = NSApplication.shared
let appDelegate = App2()
app.delegate = appDelegate
app.setActivationPolicy(.regular)
app.activate(ignoringOtherApps:true)
app.run()App2.swift
import Cocoa
class App2: NSObject, NSApplicationDelegate {
var window:NSWindow!
var view: NSView!
var customView1: CustomView1!
var customView2: CustomView2!
func buildMenu() {
let mainMenu = NSMenu()
NSApp.mainMenu = mainMenu
// **** App menu **** //
let appMenuItem = NSMenuItem()
mainMenu.addItem(appMenuItem)
let appMenu = NSMenu()
appMenuItem.submenu = appMenu
appMenu.addItem(withTitle: "Quit", action:#selector(NSApplication.terminate), keyEquivalent: "q")
}
func buildWnd() {
let _wndW: CGFloat = 400
let _wndH: CGFloat = 400
//@State var title: String = "app title"
let appTitle: String = "app title"
window = NSWindow(contentRect: NSMakeRect(0, 0, _wndW, _wndH), styleMask: [.titled, .closable, .miniaturizable, .resizable], backing: .buffered, defer: false)
window.center()
window.title = appTitle
window.makeKeyAndOrderFront(window)
// Create a label
let labelFrame = NSRect(x: 50, y: 50, width: 200, height: 30)
let labelText = "Hello, Cocoa!"
customView1 = CustomView1(frame: NSRect(x: 10, y: 50, width: 120, height: 50))
customView2 = CustomView2(frame: NSRect(x: 10, y: 100, width: 120, height: 50))
window.contentView?.addSubview(customView1)
window.contentView?.addSubview(customView2)
}
class CustomView1: NSView {
let customView2 = CustomView2(frame: NSRect(x: 10, y: 50, width: 100, height: 30))
func createButton(frame: NSRect, title: String) -> NSButton {
let button = NSButton(frame: frame)
button.title = title
button.bezelStyle = .rounded
button.target = self
button.action = #selector(buttonClicked(_:))
return button
}
override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
let button = createButton(frame: NSRect(x: 10, y: 10, width: 100, height: 30), title: "Click me!")
self.addSubview(button)
self.addSubview(customView2)
}
@objc func buttonClicked(_ sender: NSButton) {
customView2.label.stringValue = "Button clicked!"
}
}
class CustomView2: NSView {
let label = NSTextField(frame: NSRect(x: 10, y: 10, width: 100, height: 20))
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
label.stringValue = "Hello, world!"
label.isEditable = false
label.isSelectable = false
label.isBezeled = false
label.drawsBackground = false
self.addSubview(label)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
func applicationDidFinishLaunching(_ notification: Notification) {
buildMenu()
buildWnd()
}
func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
return true
}
}
1条答案
按热度按时间olmpazwi1#
下面的源代码是你的演示的重新安排。这两个自定义视图需要与appDelegate分开。就添加控件而言，自定义视图2比自定义视图1更正确。您需要使用Xcode的File/New/File创建一个名为'main.swift'的新文件。将下面的代码完整地复制/粘贴到该文件中，然后删除预先提供的AppDelegate，它应该可以正常运行。