swift - 未打开的 NSWindow isVisible 属性设置为 true

Question

我正在尝试使用 NSWindow 的 isVisible 属性来检测 NSWindow 是打开还是关闭，但它没有像我那样工作预期的。例如，我重写了 NSWindowController 的 loadWindow 方法(我需要在扩展屏幕上显示全屏网页):

override func loadWindow() {
    self.contentController = WKUserContentController();

    guard let contentController = self.contentController else {
        return
    }

    let config = WKWebViewConfiguration()
    config.userContentController = contentController


    let externalScreens = NSScreen.externalScreens()
    let screen = externalScreens.count == 0 ? NSScreen.main()! : externalScreens[0]

    window = KeyWindow(
        contentRect: NSRect(x: 0, y: 0, width: screen.frame.width, height: screen.frame.height),
        styleMask: NSBorderlessWindowMask,
        backing: NSBackingStoreType.buffered,
        defer: false,
        screen: screen
    )

    if let w = window {
        w.level = Int(CGShieldingWindowLevel())
        w.backgroundColor = NSColor.black
        w.makeKeyAndOrderFront(self)
        w.makeFirstResponder(self)

        webView = WKWebView(frame: w.frame, configuration: config)
        w.contentView = webView!

        debugPrint("Window is visible = \(w.isVisible)")
    }
}

键窗口:

import Foundation
import AppKit

class KeyWindow : NSWindow {
    override var canBecomeKey: Bool {
        return true
    }
}

但是 debugPrint 显示 isVisible 属性设置为 true，尽管窗口尚未打开(尚未调用 Controller 的 self.showWindow(self) 方法) .

如何可靠地确定窗口是否打开(显示在屏幕上)？

Answer 1

在你的代码中

if let w = window {
    w.level = Int(CGShieldingWindowLevel())
    w.backgroundColor = NSColor.black
    w.makeKeyAndOrderFront(self)
    w.makeFirstResponder(self)

    webView = WKWebView(frame: w.frame, configuration: config)
    w.contentView = webView!

    debugPrint("Window is visible = \(w.isVisible)")
}

您正在调用w.makeKeyAndOrderFront(self)检查前根据Apple documentation :

func makeKeyAndOrderFront(Any?) Moves the window to the front of the screen list, within its level, and makes it the key window; that is, it shows the window.

所以从技术上来说 isVisible正如广告所宣传的那样:) isVisible

The value of this property is true when the window is onscreen (even if it’s obscured by other windows); otherwise, false.

您的窗口应该在屏幕上 - 尽管您已将其级别设置为 CGShieldingWindowLevel它可能只是因为调用而看不见 w.makeKeyAndOrderFront(self)您可以尝试调用func orderFrontRegardless()

Apple Doc

在这种情况下，它将立即显示窗口 - 但我认为这是另一个 SO 问题