我应该使用 NSUserDefaults 还是 plist 来存储数据?

问题描述

我将存储一些字符串(可能是 10-20 个).我不确定是否应该使用 NSUserDefaults 来保存它们，或者将它们写到 plist 中.什么被认为是最佳实践?NSUserDefaults 看起来代码行更少，因此实现起来更快.

I will be storing a few strings (maybe 10-20). I am not sure if I should use NSUserDefaults to save them, or write them out to a plist. What is considered best practice? NSUserDefaults seems like it is less lines of code, therefore quicker to implement.

我想补充一点，这些字符串值将由用户添加/删除.

I'd like to add that these string values will be added/removed by the user.

推荐答案

我假设是一个数组，但它也适用于字典.

I am assuming an array, but it will work with dictionaries too.

Userdefaults、Core Data 和 Plists 都可以读/写，但如果你使用 plist，你需要注意你把它放在什么目录中.请参阅下面的 plist 部分.

Userdefaults, Core Data and Plists can all be read/write but if you use a plist you need to pay attention in what dir you put it. See the plist part down below.

核心数据我认为它太过分了，它只是字符串.当你想要持久化更复杂的对象时应该使用它.

Core Data I think it's way too much overkill, it's just strings.It's supposed to be used when you want to persist more complex objects.

NSUserDefaults:

虽然它应该只存储用户设置，但它非常快速且易于操作.将它们写入用户默认值:

It's pretty fast and easy to do, though it's supposed to store only user settings.To write them to the userdefaults:

NSArray *stringsArray = [[NSArray alloc] arrayWithObjects: string1, string2, string3, nil];
[[NSUserDefaults standardUserDefaults] setObject:stringsArray forKey:@"MyStrings"];
[[NSUserDefaults standardUserDefaults] synchronize];

从用户默认值中读取:

NSArray *stringsArray = [[NSUserDefaults standardUserDefaults] objectForKey:@"MyStrings"];

Plist:

如果您的字符串将被修改，您将需要编写和读取 plist，但您不能写入应用程序的资源.

If your strings are going to be modified you will need to write and read a plist but you cant't write into your app's resources.

1. 要有一个读/写plist，首先要找到文档目录

1. To have a read/write plist first find the documents directory

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *stringsPlistPath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Strings.plist"];

创建数组(我假设字符串是 string1，...)

Create the array (I am assuming the strings are string1, ...)

NSArray *stringsArray = [[NSArray alloc] arrayWithObjects: string1, string2, string3, nil];

写入文件

Write it to file

[stringsArray writeToFile:stringsPlistPath atomically:YES];

阅读plist:

1. 找到文档目录

1. Find the documents directory

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *stringsPlistPath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Strings.plist"];

阅读:

Read it in:

NSArray *stringsArray = [NSArray arrayWithContentsOfFile:stringsPlistPath];

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