January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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存储数据
｜
157
他们故意关闭
iCloud
选项，我们应该让游戏仍然能够运行。也就是说将游戏进度
放到本地，而不是
iCloud
。
另外，用户有可能会登出
iCloud
，然后换另一个用户登录
iCloud
。通过保存并检查
FileManager
的
ubiquityIdentityToken
，就能判断出这种情况，如果检查到这个值
和最后存储的值不相同，我们应该抛弃游戏进度的本地拷贝，重新从
iCloud
下载
这个文件。
我们应该一直在后台队列中操作
iCloud
。
iCloud
操作通常需要一点时间，如果在主
线程中执行有可能拖慢游戏并导致游戏停止响应。
5.4
使用
iCloud
的键
–
值存储
问题
有时候我们想向
iCloud
中存储零星的数据。
解决方案
NSUbiquitousKeyValueStore
对象就像一个字典对象，包含了所有跨用户设备的共
享内容。
要从键值存储中检索值，使用下列代码：
//
从键值存储中检索值
let store = NSUbiquitousKeyValueStore.default
return Int(store.longLong(forKey: "levelNumber"))
要向键值存储中存入值，使用下列代码：
//
向键值存储中存入值
let store = NSUbiquitousKeyValueStore.default
store.set (Int64(value), forKey: "levelNumber")
//
确保修改被保存到磁盘
//
（注意：并非将本地
iCloud
容器同步到 ...
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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.