将多个NSArrays按数组顺序添加到具有相应匹配项的NSMutableDictionary中

Question

我有两个数组，比如itemName和itemImages

NSArray *itemName = @[@"Blog", @"Missions", @"Subscriptions", @"Questions", @"Aide",@"Disconnect"];
NSArray *itemImages = @[@"ico-1",@"ico-2", @"ico-3", @"ico-4", @"ico-5", @"ico-6"];

我需要把它们加到字典里

 NSMutableDictionary *menuItemNameImage = [[NSMutableDictionary alloc] init];
 [menuItemNameImage setValue:itemName forKey:@"itemName"];
 [menuItemNameImage setValue:itemImages forKey:@"itemImages"];

 NSLog(@"%@", menuItemNameImage);

但是这使得下面的字典

{
    itemImages =     (
        "ico-1",
        "ico-2",
        "ico-3",
        "ico-4",
        "ico-5",
        "ico-6"
    );
    itemName =     (
        Blog,
        Missions,
        Subscriptions,
        Questions,
        Aide,
        Disconnect
    );
}

我更想要的是有人这样想：

{ 
  { 
    itemImages = "icon-1",
    itemName = Blog
  },
  { 
    itemImage = "icon-2",
    itemName = "Missions"
  }, ...
}

Answer 1

使用单个NSDictionary无法获得该结构--您需要一个NSArray of NSDictionary对象。

以下是您可以这样做的方法：

NSMutableArray *menuItemNameImage = [NSMutableArray array];
for (int i = 0 ; i != itemNames.count ; i++) {
    [menuItemNameImage addObject: @{
        @"itemName" : itemNames[i]
    ,   @"itemImage" : itemImages[i]
    }];
}

Answer 2

您可以使用的是NSArray of NSDictionaries。每个字典都有两个条目：itemImage和itemName。

会是这样的：

NSArray *itemName = @[@"Blog", @"Missions", @"Subscriptions", @"Questions", @"Aide",@"Disconnect"];
NSArray *itemImages = @[@"ico-1",@"ico-2", @"ico-3", @"ico-4", @"ico-5", @"ico-6"];

NSMutableArray *menuItemNameImage = [NSMutableArray new];

for (NSInteger i = 0; i < itemName.count; i++) {
    NSMutableDictionary *itemNameImage = [NSMutableDictionary new];

    itemNameImage[@"itemName"] = itemName[i];

    //just a precaution if the array os images is smaller than the ones of names, to avoid unwanted crashes
    if (i < itemImages.count) { 
        itemNameImage[@"itemImage"] = itemImages[i];
    }

    [menuItemNameImage addObject:itemNameImage];
}

NSLog(@"%@", menuItemNameImage);

输出，如您所需：

(
    {
        itemImage = "ico-1";
        itemName = Blog;
    },
    {
        itemImage = "ico-2";
        itemName = Missions;
    },
    {
        itemImage = "ico-3";
        itemName = Subscriptions;
    },
    {
        itemImage = "ico-4";
        itemName = Questions;
    },
    {
        itemImage = "ico-5";
        itemName = Aide;
    },
    {
        itemImage = "ico-6";
        itemName = Disconnect;
    }
)

您可以访问这样的元素，例如：

NSString *firstItemName = menuItemNameImage[0][@"itemName"]; 
NSString *firstItemImage = menuItemNameImage[0][@"itemImage"];