NSMutableArray 未保存 NSUserDefault [英] NSMutableArray not saved NSUserDefault

问题描述

我正在尝试使用 NSUSerDefault 保存 NSMutableArray，然后打开该阵列.这里有一些代码:

I'm trying to save a NSMutableArray with NSUSerDefault and then open the array. Here some code:

-(IBAction)btnSave{    
Class *aClass = [[Class alloc]init];    
aClass.idClass=@"aaaxxx";    
aClass.nameClass=@"hello";
[myArray addObject:aClass];
NSUserDefaults *arrayDefault=[NSUserDefaults standardUserDefaults];
[arrayDefault setObject:myArray forKey:@"savedArray"];
[arrayDefault synchronize]; 
}

和

- (void)viewDidLoad
{
    [super viewDidLoad];
    myArray=[[NSMutableArray alloc]init];

    NSMutableArray *savedArray=[[NSUserDefaults standardUserDefaults]objectForKey:@"savedArray"];
    if(savedArray!=NULL){
        myArray=savedArray;
        [tableView reloadData];
    }
    // Do any additional setup after loading the view from its nib.
}

当我编译并按下按钮时，这是我在日志输出中读取的内容:

when I compile and when I push the button, this is what I read on log output:

[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '(
    "<Class: 0x8452b40>"
)' of class '__NSArrayM'.  Note that dictionaries and arrays in property lists must also contain only property values

很明显，当我重新打开视图时，未加载数组.有什么帮助吗?

and obviously when I reopen the view the array is not loaded. any help?

推荐答案

NSUserDefaults 只允许在其中存储 Premitive DataType.如果要存储自定义类对象，请使用以下代码，有关更多详细信息，请参阅此 IOS 文档

NSUserDefaults allows only Premitive DataTypes to be store in it. if you want to store your custom class Object then use following code, for more Detail refer this IOS Documentation

//create an array with your custom class objects

Class *aClass = [[Class alloc]init];
aClass.idClass=@"aaaxxx";
aClass.nameClass=@"hello";

[myArray addObject:aClass];

//convert your array to `NSData` object using `NSKeyedArchiver`    
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:myArray];

//store it to `NSUserDefaults`
[[NSUserDefaults standardUserDefaults] setObject:data forKey:@"myArray"];
[[NSUserDefaults standardUserDefaults] synchronize];

//convert your stored Object back to `NSData` using `NSKeyedUnarchiver`    
NSData *storedData = [[NSUserDefaults standardUserDefaults] objectForKey:@"myArray"];
NSArray *storedArr = [NSArray arrayWithArray:[NSKeyedUnarchiver unarchiveObjectWithData:storedData]];

NSLog(@"%@",storedArr[0]);

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