在NSUserDefaults中保存NSMutableArray

Question

我需要将NSMutableArray保存为NSUserDefaults。

我已经试过这一点，但负载方法返回一个nilNSMutableArray：

// NSMutableArray *listaAenviar = [[NSMutableArray alloc]init]; 

-(void) saveArray { 
NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults]; 
[_listaAenviar addObject:@"1"]; 
[currentDefaults setObject:[NSKeyedArchiver archivedDataWithRootObject:[_listaAenviar mutableCopy]] forKey:@"listaAenviar"]; 
[currentDefaults synchronize]; 
} 

-(void) loadArray { 
NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults]; 
_listaAenviar = [currentDefaults objectForKey:@"listaAenviar"]; 
} 

Answer 1

尝试使用这些方法来保存阵列，方便很多。

-(void)saveData :(NSMutableArray *)dataArray 
{ 
    NSFileManager *filemgr; 
    NSString *docsDir; 
    NSArray *dirPaths; 

    filemgr = [NSFileManager defaultManager]; 

    // Get the documents directory 
    dirPaths = NSSearchPathForDirectoriesInDomains(
                NSDocumentDirectory, NSUserDomainMask, YES); 

    docsDir = [dirPaths objectAtIndex:0]; 

    // Build the path to the data file 
    NSString *dataFilePath = [[NSString alloc] initWithString: [docsDir 
                 stringByAppendingPathComponent: @"data.archive"]]; 

    [NSKeyedArchiver archiveRootObject: 
    dataArray toFile:dataFilePath]; 
} 


-(NSMutableArray *)loadData 
{ 
    NSFileManager *filemgr; 
    NSString *docsDir; 
    NSArray *dirPaths; 

    filemgr = [NSFileManager defaultManager]; 

    // Get the documents directory 
    dirPaths = NSSearchPathForDirectoriesInDomains(
                NSDocumentDirectory, NSUserDomainMask, YES); 

    docsDir = [dirPaths objectAtIndex:0]; 

    // Build the path to the data file 
    NSString *dataFilePath = [[NSString alloc] initWithString: [docsDir 
                 stringByAppendingPathComponent: @"data.archive"]]; 

    // Check if the file already exists 
    if ([filemgr fileExistsAtPath: dataFilePath]) 
    { 
     NSMutableArray *dataArray; 

     dataArray = [NSKeyedUnarchiver 
        unarchiveObjectWithFile: dataFilePath]; 

     return dataArray; 
    } 
    return NULL; 
}