Question

我正在使用NSUserDefault构建这个“添加到收藏夹”。将数组添加到NSMutableArray时遇到此问题。有谁知道我做错了什么？非常感谢你。

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSMutableArray *favoriteRecipes = [[NSMutableArray alloc] init];


if ([prefs objectForKey:@"myFavor"] == nil) {
    //create the array
    NSMutableArray *array = [[NSMutableArray alloc] init];
    [prefs setObject:array forKey:@"myFavor"];
    [array release];
}
NSMutableArray *tempArray = [[prefs objectForKey:@"myFavor"] mutableCopy];
favoriteRecipes = tempArray;
[tempArray release];

NSArray *charArray = [[NSArray alloc] initWithObjects: @"test1", @"test2" , nil];

//add the recipe
[favoriteRecipes addObject:[charArray objectAtIndex:0]];  

//save the array to NSUserDefaults
[prefs setObject:favoriteRecipes forKey:@"myFavor"];
[prefs synchronize];

Answer 1

favoriteRecipes = tempArray;

instated of above line use be below line it will work fine 

[favoriteRecipes addObjectsFromArray:tempArray];

Answer 2

昨天做了类似的事。看下面的代码。我不确定你是否想和我一样。

NSDictionary *tempDictionary = [NSDictionary dictionaryWithObjectsAndKeys:productID,@"ID",productTitle,@"title",productPrice,@"price",imageUrl,@"image",shipping,@"shipping_day", nil];

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSMutableArray *cartList = [[defaults objectForKey:@"CART_ITEMS"] mutableCopy];

if(!cartList)
    cartList = [[NSMutableArray alloc] init];

if([cartList indexOfObject:tempDictionary] == NSNotFound)
{
    NSLog(@"add favorite");
    [cartList addObject:tempDictionary];
    [defaults setObject:cartList forKey:@"CART_ITEMS"];
    [defaults synchronize];
    [sender setTitle:@"Remove" forState:UIControlStateNormal];
}
else
{
    NSLog(@"remove favorite");
    [cartList removeObject:tempDictionary];
    [defaults setObject:cartList forKey:@"CART_ITEMS"];
    [defaults synchronize];
    [sender setTitle:@"Add to cart" forState:UIControlStateNormal]; 
}

这是我每次想要来自NSUserDefault的最喜欢的列表时所做的事情

-(void)getCartList
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSMutableArray *cartList = [[defaults objectForKey:@"CART_ITEMS"] mutableCopy];
productListArr = [NSMutableArray arrayWithArray:cartList];
NSLog(@"cart list data == %@", cartList);
}

无法将对象添加到NSMutableArray

2 个答案: