Using Window Notifications and Delegate Methods

最新推荐文章于 2019-10-14 10:47:03 发布

转载最新推荐文章于 2019-10-14 10:47:03 发布 · 533 阅读

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本博客详细介绍了NSWindow类提供的丰富通知系统，包括窗口状态改变、大小调整、暴露与关闭等事件，以及相应的代理方法如何自动注册并响应这些通知。同时，还讨论了窗口关闭请求、大小限制、窗口帧设置和字段编辑处理等功能。

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Using Window Notifications and Delegate Methods

The NSWindow class offers observers a rich set of notifications, which it broadcasts on such occurrences as gaining or losing key or main window status, minimizing, moving or resizing, becoming exposed, and closing. Each notification is matched to a delegate method, so a window’s delegate is automatically registered for all notifications that it has methods for. The NSWindow class also offers its delegate a few other methods, such aswindowShouldClose:, which requests approval to close, windowWillResize:toSize:, which allows the delegate to constrain the window’s size, windowWillUseStandardFrame:defaultFrame:, which allows the delegate to set the window frame for zooming, and windowWillReturnFieldEditor:toObject:, which gives the delegate a chance to modify the field editor or substitute a different editor. See the individual notification and delegate method descriptions for more information.