macos – 使用Swift和Cocoa创建nswindow的正确方法

@class WindowTestController;

@interface AppDelegate : NSObject <NSApplicationDelegate> {
    IBOutlet NSWindow        *window;
    WindowTestController     *windowController;
}
    @property (weak) IBOutlet NSWindow *window;
    @property (strong) WindowTestController *windowController;

    - (IBAction) buttonClicked:(id)sender;
@end

然后

#import "AppDelegate.h"
    #import "WindowTestController"

    @implementation AppDelegate

    @synthesize window;
    @synthesize windowController;

- (IBAction) buttonClicked:(id)sender {
    if (windowController == nil) 
           testWindow = [[WindowTestController alloc] init];
           [windowController showWindow:nil];
    }

@end

在尝试快速做类似的事情时,我得到了以下内容

import Cocoa

class AppDelegate: NSObject,NSApplicationDelegate {

    var testWindow: NSWindowController = WindowTestController(windowNibName: "Window")

    @IBOutlet var window: NSWindow

    @IBAction func buttonClicked(sender : AnyObject) {

        testWindow.showWindow(nil)
}

    func applicationDidFinishLaunching(aNotification: NSNotification?) {
        // Insert code here to initialize your application
    }

    func applicationWillTerminate(aNotification: NSNotification?) {
        // Insert code here to tear down your application
    }
}

在这种情况下,因为我必须为testWindow属性设置一个默认值,所以在我需要它之前我正在创建一个WindowTestController实例.即我不需要这样做

if (windowController == nil)

这是正确的还是有其他方法在需要时分配资源,还是我什么都不担心？

干

if (windowController == nil) 
       testWindow = WindowTestController(windowNibName: "Window")
}

没有AppDelegate属性窗口中的结果立即消失(即我认为已取消分配).