如何获取Firebase数据库中密钥的值并将其传递给TextField？

I was wondering how I can find the value of a key in my JSON database using Objective C and pass it to a textfield. I want to collect data from the 3rd key in my database (Excluding the title node, of course) but every explanation on how to just doesn't seem to work. The code for traversing to the right location is:I was wondering how I can find the value of a k