GA4 - iOS - Swift - view_item_list

// Products can be instrumented as an array of items that can be added to prescribed ecommerce events.

//When a user is presented with a list of results, log a view_item_list event including an items array parameter containing the displayed products.

// A pair of jeggings (product1)
var jeggings: [String: Any] = [
  AnalyticsParameterItemID: "SKU_123",                      //Item ID (context-specific) (NSString).
  AnalyticsParameterItemName: "jeggings",                   //Item Name (context-specific) (NSString).
  AnalyticsParameterItemCategory: "pants",                  //Item category (context-specific) (NSString).
  AnalyticsParameterItemCategory2: "sub-cat1",              //Item sub-category (context-specific) (NSString).
  AnalyticsParameterItemCategory3: "sub-cat2",              //Item sub-category (context-specific) (NSString).
  AnalyticsParameterItemCategory4: "sub-cat3",              //Item sub-category (context-specific) (NSString).
  AnalyticsParameterItemCategory5: "sub-cat4",              //Item sub-category (context-specific) (NSString).
  AnalyticsParameterItemVariant: "black",                   //Item variant (NSString).
  AnalyticsParameterItemBrand: "Google",                    //Item brand(NSString).
  AnalyticsParameterPrice: 9.99,                            //Product price (double as NSNumber).
]

// A pair of boots (product2)
var boots: [String: Any] = [
  AnalyticsParameterItemID: "SKU_456",
  AnalyticsParameterItemName: "boots",
  AnalyticsParameterItemCategory: "shoes",
  AnalyticsParameterItemCategory2: "sub-cat1",
  AnalyticsParameterItemCategory3: "sub-cat2",
  AnalyticsParameterItemCategory4: "sub-cat3",
  AnalyticsParameterItemCategory5: "sub-cat4",
  AnalyticsParameterItemVariant: "brown",
  AnalyticsParameterItemBrand: "Google",
  AnalyticsParameterPrice: 24.99,
]

// A pair of socks (product3)
var socks: [String: Any] = [
  AnalyticsParameterItemID: "SKU_789",
  AnalyticsParameterItemName: "ankle_socks",
  AnalyticsParameterItemCategory: "socks",
  AnalyticsParameterItemCategory2: "sub-cat1",
  AnalyticsParameterItemCategory3: "sub-cat2",
  AnalyticsParameterItemCategory4: "sub-cat3",
  AnalyticsParameterItemCategory5: "sub-cat4",
  AnalyticsParameterItemVariant: "red",
  AnalyticsParameterItemBrand: "Google",
  AnalyticsParameterPrice: 5.99,
]

// Add item indexes
jeggings[AnalyticsParameterIndex] = 1                               //The index of the item in a list (signed 64-bit integer as NSNumber).
boots[AnalyticsParameterIndex] = 2
socks[AnalyticsParameterIndex] = 3

// Prepare ecommerce parameters
var itemList: [String: Any] = [
  AnalyticsParameterItemListID: "L001",                             //The ID of the list in which the item was presented to the user (NSString).
  AnalyticsParameterItemListName: "Related products",               //The name of the list in which the item was presented to the user (NSString).
]

// Add items array
itemList[AnalyticsParameterItems] = [jeggings, boots, socks]        //The list of items involved in the transaction. (NSArray).

// Log view item list event to firebase analytics
Analytics.logEvent(AnalyticsEventViewItemList, parameters: itemList)