为什么很多iOS软件的启动页需要等好几秒？

这个问题的答案其实可以毁非常多UI和PM长久以来的三观，其实Apple要求的Launch Image（下称启动页）不允许这样啊！！！不允许啊！！不啊！

先上简化结论——

启动页的作用：

提高用户体验，减少用户焦虑

效应

商业需求

情怀（褒义）

而不同的作用必然会带来不同的体验。

好了，针对上述的4种，我要开始摊大饼了！！

1. 提高用户体验，减少用户焦虑

原本Apple设计启动页的目的仅仅是为了让用户觉得你的APP已准备好给用户使用，减少用户打开启动到正常使用的焦虑感。

引用Apple HIG原文[1]：

Design a plain launch image that improves the user experience. In particular, the launch image isn’t an opportunity to provide:

An “app entry experience,” such as a splash screen An About window Branding elements, unless they are a static part of your app’s first screen

Because users are likely to switch among apps frequently, you should make every effort to cut launch time to a minimum, and you should design a launch image that downplays the experience rather than drawing attention to it.

Design a launch image that is identical to the first screen of the app, except for:

Text. The launch image is static, so any text you display in it won’t be localized. UI elements that might change. If you include elements that might look different when the app finishes launching, users can experience an unpleasant flash between the launch image and the first app screen.

If you think that following these guidelines will result in a plain, boring launch image, you’re right. Remember, the launch image doesn’t provide you with an opportunity for artistic expression. It’s solely intended to enhance the user’s perception of your app as quick to launch and immediately ready for use. For example, Settings and Weather each supply a launch image that is little more than a background image.

注意我加粗的三个词——isn’t, plain, boring

精简下大意就是：

你的启动页三不要——不要闪一个页面再进去！不要当做关于xxx的页面！不要有元素！

你的启动页最好——单调！无聊！

对，你没看错，你真的没看错，国内APP占全了三不要，继续看…