通常我会使用此方法打开一个带窗口控制器的新窗口
@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
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).
这可能是懒惰的工作
原文链接：https://www.f2er.com/swift/318640.htmlclass AppDelegate : NSApplicationDelegate {
lazy var windowController = WindowTestController(windowNibName: "Window")
@IBAction func buttonClicked(sender : AnyObject) {
windowController.showWindow(sender)
}
}
self.windowController既不会被分配也不会被nil,直到你试图调用它,此时它将被引入.但直到那个时候.
