将NSMutableArray保存在文件中

Question

我正在尝试将一个NSMutableArray与对象保存到一个文件中。没有错误，当我调试代码时，对象Recipe总是有一个内容永远不会是空的，但productsList永远不会添加这个对象...我对此感到疯狂，一些想法？

#import "Utils.h"
#import "Recipe.h"

@implementation Utils
{

NSFileManager *filemgr;
NSString *docsDir;
NSArray *dirPaths;
NSString *dataFilePath;

}

-(Utils*) init {
self = [super init];

if (self) {
    filemgr = [NSFileManager defaultManager];

    // Get the documents directory
    dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    docsDir = [dirPaths objectAtIndex:0];
    // Build the path to the data file
    dataFilePath = [[NSString alloc] initWithString: [docsDir stringByAppendingPathComponent: @"wish.info"]];

}

return self;
}

-(NSMutableArray * )loadProducts{

return [NSKeyedUnarchiver unarchiveObjectWithFile:dataFilePath];
}
-(void) saveProducts: (NSMutableArray * ) productsList{
[NSKeyedArchiver archiveRootObject:productsList toFile:dataFilePath];

NSLog(@"Products List%@",productsList);
}

-(void) addProduct: (Recipe*) recipe{

NSMutableArray *productsList = [self loadProducts];

[productsList addObject:recipe];

[self saveProducts:productsList];
}
-(void) deleteProduct: (Recipe*) recipe{
NSMutableArray *productsList = [self loadProducts];

[productsList removeObject:recipe];

[self saveProducts:productsList];
}
-(Boolean) isSelected: (Recipe*) recipe{
return [[self loadProducts] containsObject:recipe];
}

@end