问题描述
在NSUserDefaults / keychains中存储一些值有没有原子或非原子属性的任何优势？
For storing some values in NSUserDefaults / keychains is there any advantage of having atomic or non-atomic properties?
推荐答案
之间的区别是，原子要求所有数据必须成功写入，而非原子意味着尽可能写入（即不一定全部
The difference between "atomic" and "non-atomic" is that atomic requires that all of the data must be successfully written while "non-atomic" means "write as much as possible" (i.e. not necessarily all of it).
因此，对于许多事情（例如小数据位），非原子或原子之间没有太大的实际差异。
So for many things (e.g. small bits of data), there's not much of a practical difference between non-atomic or atomic.
但是对于更大的数据块，非原子对原子实际上产生了差异。您需要将写入的数据完全百分百完整，或者您的应用程序是否只处理已写入默认或钥匙串的数据？
But for larger blocks of data, then non-atomic vs. atomic actually makes a difference. Do you need to have the data that's written to be 100% perfect and complete, or can your app handle just some of whatever has been written to default or the keychain?
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