如何打开只有一个窗口“首选项”？(How open only one window “Preferences”?)

如何打开只有一个窗口“首选项”？(How open only one window “Preferences”?)

我的应用程序有Preferences窗口。 我用这个代码打开它

- (IBAction)openPreferences:(id)sender { NSWindowController *windowController = [[NSWindowController alloc] initWithWindowNibName:@"Preferences"]; [windowController window]; }

如果按下命令，再次 - 一次又一次，新的“首选项”窗口将再次打开 - 一遍又一遍......

如何打开一个窗口？ 谢谢！

My app have Preferences window. I open it using this code

- (IBAction)openPreferences:(id)sender { NSWindowController *windowController = [[NSWindowController alloc] initWithWindowNibName:@"Preferences"]; [windowController window]; }

If press command, again-again and again new Preferences window will be opened again-again and again...

How open only one window? Thanks!

最满意答案

使windowController成为你的AppDelegate的一个实例变量并且改变你的打开首选项

- (IBAction)openPreferences:(id)sender { if( windowController == nil ) windowController = [[NSWindowController alloc] initWithWindowNibName:@"Preferences"]; [windowController showWindow:sender]; }

Make windowController a instance variable of your AppDelegate and change your open preferences to

- (IBAction)openPreferences:(id)sender { if( windowController == nil ) windowController = [[NSWindowController alloc] initWithWindowNibName:@"Preferences"]; [windowController showWindow:sender]; }