You need a developer account to access any of the documentation pertaining to any sort of Apple development. I assume they want you to log in to they can see how many developers are floating around and also so you can authenticate your profile and download the docs from their servers.
If you trying to access documentation that is part of the beta build then you for sure need to purchase and development account versus using the free version, since only paid developers can download, use and distribute their apps.
If you are having this issue, but local docs are installed. Try removing the iOS 5.0 library and adding it again via Preferences-> Documentation. The Base URL changed when iOS 5 was released (no longer pre-release), but the updater doesn't trigger an update of that automatically.
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您需要一个开发者帐户才能访问与任何类型的 Apple 开发相关的任何文档。我假设他们希望您登录，他们可以看到有多少开发人员在流动，这样您就可以验证您的个人资料并从他们的服务器下载文档。
如果您尝试访问 Beta 版本的文档，那么您肯定需要购买和开发帐户，而不是使用免费版本，因为只有付费开发人员才能下载、使用和分发他们的应用程序。
You need a developer account to access any of the documentation pertaining to any sort of Apple development. I assume they want you to log in to they can see how many developers are floating around and also so you can authenticate your profile and download the docs from their servers.
If you trying to access documentation that is part of the beta build then you for sure need to purchase and development account versus using the free version, since only paid developers can download, use and distribute their apps.
如果您遇到此问题，但已安装本地文档。尝试删除 iOS 5.0 库并通过“首选项”->“再次添加”文档。 iOS 5 发布（不再是预发布）时，基本 URL 发生了变化，但更新程序不会自动触发该更新。
If you are having this issue, but local docs are installed. Try removing the iOS 5.0 library and adding it again via Preferences-> Documentation. The Base URL changed when iOS 5 was released (no longer pre-release), but the updater doesn't trigger an update of that automatically.