CollectionViewController是空白的

Question

弹出的代码中没有错误，当应用程序在模拟器中加载时，它完全是空白的。我认为PList数据没有正确填充到数组中可能是一个问题，但我不确定即使页眉/页脚没有显示出来。

以下是其中一个Plists的示例（共有4个plist，所有结构都相同，只是分配给不同的对象）：

以下是分配给数组的其中一个对象的代码，然后将这些数组的各个部分放入单独的数组中，以跟踪其标签的缩略图和名称：

//BEGIN INGREDIENT ITEM DATA
    NSString *ingredientItemsPath = [[NSBundle mainBundle] pathForResource:@"IngredientList" ofType:@"plist"];
    NSMutableArray *ingredientItemsArray = [[NSMutableArray alloc] initWithContentsOfFile:ingredientItemsPath];
    /*NSString *ingredientItemsPath = [[NSBundle mainBundle] pathForResource:@"ingredientList" ofType:@"plist"];
    NSDictionary *ingredientItemsDict = [[NSDictionary alloc] initWithContentsOfFile:ingredientItemsPath];
    NSArray *ingredientItemsArray = [NSArray arrayWithArray:[ingredientItemsDict objectForKey:@"Root"]];*/
    NSMutableArray *cCalcIngredientObjects = [[NSMutableArray alloc] init];
    for (int index=0; index < ingredientItemsArray.count; index++)
    {
        CCalcIngredients* ingredient = [[CCalcIngredients alloc] init]; // This is your object
        NSDictionary* ingredientDict = (NSDictionary*)ingredientItemsArray[index];
        ingredient.name = ingredientDict[@"name"];
        ingredient.thumbnail = ingredientDict[@"thumbnail"];
        NSDictionary* ingredientNutritionDict = (NSDictionary*)ingredientDict[@"nutrition"];
        ingredient.calories = ingredientNutritionDict[@"calories"];
        ingredient.totalFat = ingredientNutritionDict[@"totalFat"];
        ingredient.saturatedFat = ingredientNutritionDict[@"saturatedFat"];
        ingredient.transFat = ingredientNutritionDict[@"transFat"];
        ingredient.cholesterol = ingredientNutritionDict[@"cholesterol"];
        ingredient.sodium = ingredientNutritionDict[@"sodium"];
        ingredient.totalCarbs = ingredientNutritionDict[@"totalCarbs"];
        ingredient.dietaryFiber = ingredientNutritionDict[@"dietaryFiber"];
        ingredient.proteins = ingredientNutritionDict[@"proteins"];
        [cCalcIngredientObjects addObject:ingredient];
    }
    //END INGREDIENT ITEM DATA

    NSLog(@"The ingredient items are %@", cCalcIngredientObjects);

    //array of photos
    self.photos = [[NSMutableArray alloc] init];
    for(CCalcMeals* item in cCalcMenuObjects){
        [self.photos addObject:item.thumbnail];
    }
    for(CCalcMeat* meat in cCalcMeatObjects){
        [self.photos addObject:meat.thumbnail];
    }
    for(CCalcSalsa* salsa in cCalcSalsaObjects){
        [self.photos addObject:salsa.thumbnail];
    }
    for(CCalcIngredients* ingredient in cCalcIngredientObjects){
        [self.photos addObject:ingredient.thumbnail];
    }
    NSLog(@"photos %@", self.photos);

当我针对我创建的所有数组运行它时，NSLog会打印出来：

我试图弄清楚为什么这只是建立一个空白的黑色模拟器屏幕，并弄清楚我的Plist数据是什么以及它是否正确构建。

Answer 1

在搞乱代码时，我发现我试图将Plist中的信息作为数组提取出来，即使根信息实际上是一个字典，所以现在我确切地知道为什么我的NSLog只返回Nil 。 感谢您的帮助和提示！