Swift, Loop through JSON returning Null

Question

I am trying to loop through a list of bands that I have in a json file (Using Swifty-Json), for some reason when I get down to looping through the names, it returns null.

Json

Small snippet of the JSON

[  
{  
  "Band":{  
     "ID":"1",
     "Name":"The Kooks"
  }
},
{  
  "Band":{  
     "ID":"2",
     "Name":"The Killers"
  }
}
]

Swift Code

 for (_, value) in json {
    for (_,band) in value["Band"] {
       for (_,bandname) in band["Name"] {
           print("Band name: \(bandname)")
       }
     }
 }

The above code returns:

Band name: null

Band name: null

Band name: null

Band name: null

When I try this:

for (_, value) in json {
   for (_,brand) in value["Band"] {
      print(band)
   }
}

I get this result:

The Kooks

1

The Killers

2

Can anyone tell me what the issue is?

David Berry · Accepted Answer · 2016-02-02 23:17:53Z

1

Since the value associated with the key "Name" is a simple string, you want to use:

for (_, value) in json {
    for (_,band) in value["Band"] {
       if let bandname = band["Name"].string {
           print("Band name: \(bandname)")
       } else {
           print("No name specified")
       }
    }
}

edited Feb 2, 2016 at 23:17

answered Feb 2, 2016 at 22:54

David Berry

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7 Comments

JamesG Over a year ago

On the if let line, I get this error: Initializer for conditional binding must have Optional type, not 'JSON'

David Berry Over a year ago

Then you should probably mention what you're actually using to parse the JSON itself :)

JamesG Over a year ago

Is the code above not parsing JSON? I'm sure my question shows that I am looping through and trying to display the Names from the JSON

David Berry Over a year ago

Never mind, I missed the "swifty-json" part, which is essentially what I'm asking.

JamesG Over a year ago

oh, ok. I am a little nooby so I was worried I used the wrong terminology. Do, you have any idea with swifty-json what is the problem?

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