提取值從__NSArrayM

Question

我已經印刷，我想是這樣的值：

a = Optional(<__NSArrayM 0x1704494b0>(9)) 

我如何提取價值9？ 我寫了這一點，但錯誤的是：let a = (parseJSON[index] as AnyObject).object(forKey: "subjects_count")

Answer 1

試試這個： -

guard let a = (parseJSON[index] as AnyObject).object(forKey: "subjects_count"), let value = a.first else {return} 
let stringValue = String(value) 
print(stringValue) 

Answer 2

使用SWIFT原生類型和主鍵/索引訂閱

if let dict = parseJSON[index] as? [String:Any], 
    let subjectsCount = dict["subjects_count"] as? [Int], !subjectsCount.isEmpty { 
    print(subjectsCount[0]) 
}