如何在启动Cocoa应用程序时显示启动屏幕？ [英] How to show a splash screen during launch of a Cocoa app?

问题描述

我想在我的基于Cocoa的应用程序启动时向用户显示启动屏幕（图片）。这是怎么可能的？

I would like to show the user a splash screen (a picture) while my Cocoa-based application launches. How would this be possible?

首先感谢很多。因为我的应用程序运行了一段时间，所以我想在应用程序运行之前显示一个飞溅。现在如果我显示一个窗口里面的图像，那之后如何运行应用程序？如何确保应用程序运行后的闪屏显示？如何获得序列？

First thanks a lot. because my app running for a while time , so I want to show a splash before app running . Now if I show a window inside with a image , after that how to run the app? How to make sure that the app running after the splash showing ? How to do to get the sequence ?

首先非常感谢。我在applicationWillFinishLaunching方法中使用orderFront显示窗口，然后隐藏它在applicationDidFinishLaunching：使用orderOut，现在我发现mainWindow不显示和应用程序终止，为什么？如何解决这个问题？谢谢！

First Thank you very much. And I show the window in applicationWillFinishLaunching method use orderFront,then hide it in applicationDidFinishLaunching: use orderOut,Now I found that the mainWindow not to show and the app terminate ,why ? How to do to resolute this question? Thanks!

推荐答案

虽然彼得的答案最终是正确的（你应该重写应用程序以更快地启动） ，有时这不是一个实用的选择。例如，稍后在应用中加载代码可能花费太长时间（例如，数据获取应用），迫使其在启动时加载。如果你决定要显示一个初始屏幕，最简单的方法是在应用程序委托的 applicationWillFinishLaunching：方法中显示它。在应用程序MainMenu.nib中创建一个启动窗口，并向您的应用程序委托添加引用该窗口的插座。然后可以在 applicationWillFinishLaunching：中将窗口放在屏幕上，并将其隐藏在 applicationDidFinishLaunching：中。注意，主线程的NSRunLoop在这段时间内不会迭代，所以如果你想更新启动屏幕（状态，进度条等），你需要自己管理这些重绘事件。

Although Peter's answer is ultimately correct (you should rewrite your app to launch faster), sometimes that's not a practical option. For example loading code later in the application may take too long (e.g. a data acquisition application), forcing it to be loaded at startup. If you decide that you want to show a splash screen, the easiest way is to show it in the application delegate's applicationWillFinishLaunching: method. Create a splash window in your applications MainMenu.nib and add an outlet to your app delegate referencing that window. You can then put the window onscreen in applicationWillFinishLaunching: and hide it in applicationDidFinishLaunching:. Note that the main thread's NSRunLoop is not iterating during this time, so if you want to update the splash screen (with status, a progress bar, or such), you'll need to manage those redraw events yourself.

再次，想想很长的启动是否有必要。如果是，显示带有进度指示器的启动画面是您欠您的用户的最低金额。

Again, think very hard about whether the long startup is necessary. If it is, showing a splash screen with a progess indicator is the minimum that you owe your users.

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