的类型data[Items]不是，Array但实际上是Array<[String: Any]>。
您可以将其压缩为更少的步骤，但是我更喜欢多步骤的清晰度：
var data: [String: Any] = [
"key1": "example value 1",
"key2": "example value 2",
"items": []
]
for index in 1...3 {
let item: [String: Any] = [
"key": "new value"
]
// get existing items, or create new array if doesn't exist
var existingItems = data["items"] as? [[String: Any]] ?? [[String: Any]]()
// append the item
existingItems.append(item)
// replace back into `data`
data["items"] = existingItems
}
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