将NSArray保存到NSUserDefaults并将其保存在NSMutableArray中 [英] Saving NSArray to NSUserDefaults and getting it in NSMutableArray

问题描述

如何在 NSUserDefaults 中保存 NSArray ，然后将其重新加载到 NSMutableArray c $>

How can I save NSArray in NSUserDefaults and then load it back in an NSMutableArray to populate the UIPickerView?

此外，问题是添加新的值到 NSMutableArray ，然后该数组将转换为 NSArray ，保存在 NSUserDefaults （ NSMutableArray 无法保存在 NSUserDefaults ）中。

Also the issue is that new values would be added to that NSMutableArray and then that array will be converted to NSArray to be saved in NSUserDefaults (as NSMutableArray can't be saved in NSUserDefaults).

任何帮助。

感谢

推荐答案

 [[NSUserDefaults standardUserDefaults] setObject:yourMutableArray forKey:@"Key"];

一个可变数组可以存储，因为它是NSArray的子​​类。

A mutable array can be stored since it is a subclass of NSArray.

要获取NSMutableArray的值：

To get the value as an NSMutableArray:

NSMutableArray *array = [NSMutableArray arrayWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:@"Key"]];

或

NSMutableArray *array = [[[NSUserDefaults standardUserDefaults] objectForKey:@"Key"] mutableCopy];

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