Question

Xcode版本7.3（7D175）
Swift Version 2.2
Mac OS版本OS X El Capitan 10.11.4

我想为Mac OS制作桌面应用程序我设置了窗口级别，但它不起作用。

Answer 1

在任何自定义代码

之前，您需要检查窗口！= nil

class ViewController: NSViewController {
    var addedObserver = false

    override func viewDidLoad() {
        super.viewDidLoad()

        if let window = self.view.window {
            // custom window here
            window.level = Int(CGWindowLevelForKey(.FloatingWindowLevelKey))
        } else {
            addedObserver = true
            self.addObserver(self, forKeyPath: "view.window", options: [.New, .Initial], context: nil)
        }
    }

    override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
        if let window = self.view.window {
            // custom window here
            window.level = Int(CGWindowLevelForKey(.FloatingWindowLevelKey))
        }
    }

    deinit {
        if addedObserver {
            self.removeObserver(self, forKeyPath: "view.window")
        }
    }
}

Answer 2

仍在测试它，但这是Larva在Swift 4中的答案，它似乎正在发挥作用。

var observingFloat = false

 override func viewDidLoad() {
        super.viewDidLoad()
        self.view.wantsLayer = true

        if self.view.window != nil {
            NSApplication.shared.windows.first?.level = NSWindow.Level(rawValue: 1)
        } else {
            observingFloat = true
            self.addObserver(self, forKeyPath: "view.window", options: [.new, .initial], context: nil)
        }
    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {

        if self.view.window != nil {
            NSApplication.shared.windows.first?.level = NSWindow.Level(rawValue: 1)
        }
    }

Answer 3

让您的应用始终位于Swift 5中的其他应用之上非常简单。

override func viewDidAppear() {
    view.window?.level = .floating
}

如何使用Swift保持窗口始终处于顶部？

3 个答案: