swift - 有没有办法在 swift 中缩短首选项列表

Question

有没有办法在一行中设置这个举例说明

appwindow(setContentSize(NSSize(width: 400, height: 23),titlebarAppearsTransparent = true) 等

不必一一拼写

    appWindow.setContentSize(NSSize(width: 400, height: 23))
    appWindow.titlebarAppearsTransparent = true
    appWindow.isMovableByWindowBackground = true
    appWindow.backgroundColor =  NSColor.white //Maybe have it gray instead so we can remove this?
    appWindow.setFrameAutosaveName(NSWindow.FrameAutosaveName(rawValue: "myGoodGoodApp"))
    appWindow.makeKeyAndOrderFront(nil)
    appWindow.contentView?.addSubview(gunTrigger)

Answer 1

您可以使用立即执行的闭包为自己提供一个范围，您可以在其中使用一个短变量名，同时允许您在其余用法中保留一个更好、更长的名称。这是对值类型特别有用的技术，因为它允许您将可变性限制在闭包中。

let appWindow: NSWindow = {
    let w = NSWindow()
    w.setContentSize(NSSize(width: 400, height: 23))
    w.titlebarAppearsTransparent = true
    w.isMovableByWindowBackground = true
    w.backgroundColor =  NSColor.white //Maybe have it gray instead so we can remove this?
    w.setFrameAutosaveName(NSWindow.FrameAutosaveName(rawValue: "myGoodGoodApp"))
    w.makeKeyAndOrderFront(nil)
    w.contentView?.addSubview(gunTrigger)
    return w
}()