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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166
｜
第
5
章
}
}
func endGame() {
//
当游戏结束，金币数清零，但钻石数不清零
gold = 0
}
}
讨论
在这个解决方案中，
gems
属性将它的值保存到
UserDefaults
系统，而不是简单地
放到内存里（而
gold
属性是放到内存里的）。对于其他对象来说，可能会这样使
用这个属性：
let currency = CurrencyManager()
currency.gold = 45
currency.gems = 21
currency.endGame()
一旦数据被保存到
UserDefaults
，它会在
App
多次运行中保持存在。也就是说，
哪怕是应用程序退出后，有的玩家就喜欢这样干，但不管怎么样，钻石数仍然是之
前保存的值。注意，保存在用户
Defaults
系统中的数据是可以被玩家修改的，这
样也是有可能作弊的。
5.10
保存到
CloudKit
问题
你想将游戏数据保存到
CloudKit
，即苹果的云存储方案。
解决方案
要使用
iCloud
，你首先需要开启
App
的
iCloud
能力，请参考问题
5.3
中所说的步骤。
然后你必须单独为项目配置
CloudKit
。在
iCloud
设置中，勾选
CloudKit
，
Xcode
会为将你的
APP
的
iCloud
容器设置为
CloudKit
。
存储数据
｜
167
如果你点击
CloudKit Dashboard
按钮，你将进入网页版的
CloudKit
dashboard
，通过它你可以查看和管理你存储到
CloudKit
中的数据。 ...
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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.
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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.