如果你想创建一个新窗口的单独类，这些是步骤：

If you want to create a separate class for New Window, these are the steps:

1. 创建一个类，它是NSWindowController的子类NewWindowController


2. 为NewWindowController类创建窗口xib。



3. 按钮上的代码为：

1. Create a class which is a sub class of NSWindowController e.g. NewWindowController
2. Create a window xib for NewWindowController class.

3. On button click code as:

NewWindowController *controllerWindow = [[NewWindowController alloc] initWithWindowNibName:@"You Window XIB Name"];
[controllerWindow showWindow:self];