swift - 从 __NSArrayM 中提取值

Question

我打印了我想要得到的值，是这样的:

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

如何提取值 9？我写了这个但是错了:let a = (parseJSON[index] as AnyObject).object(forKey: "subjects_count")

Answer 1

试试这个:-

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