February 2017
Beginner to intermediate
472 pages
9h 53m
Chinese
Content preview from Swift学习手册
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扩展
iOS
应用
｜
305
•
分享扩展（
share extension
）：与动作扩展十分相似，让你的应用接收内容，然后分享。
Twitter
、
Facebook
和
Pinterest
应用都提供了分享扩展。
•
链接分享扩展（
shared links extension
）：让应用把链接放到
Safari
的“共享的链接”
区域。例如，
Twitter
应用提供了这样的扩展，你关注的人发布的包含链接的推文都
会出现在
Safari
中。
前面说过，本章将构建两个扩展：
•
一个
Spotlight
索引扩展，让
iOS
定期运行，更新
Spotlight
搜索系统。
•
一个“今天”扩展，让应用在通知中心里显示一个小组件（
widget
），当用户从屏
幕顶部向下轻扫时显示。
为这个
iOS
应用添加
Apple Watch
支持时，还会添加一个应用扩展。
13.1
使用
Spotlight
索引扩展搜索
Spotlight
（见图
13-1
）是
iOS
内置的搜索系统。在主屏幕向下轻扫就会进入
Spotlight
，
在那里可以搜索设备和
Web
中的内容。
如果想让你应用的内容出现在
Spotlight
中，需要把内容添加到可搜索的索引中。可搜索
的索引是搜索数据库，用于定位设备中的一切；索引中没有的内容，不会出现在搜索结
果中。
在
第
12
章，我们使用
NSUserActivity
把文档标记为可搜索的。但是有个局限：只有打
开过文档，才能搜索。如果用户在其他设备中修改了文档的内容，搜索索引不会更新，
除非再次打开文档。
为了解决这个问题，我们将添加一个
Spotlight
索引扩展。系统会定期唤醒这个扩展，更 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.