使用swift解析json

let jsonObject = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers)
print(jsonObject)

let array = jsonObject as! NSArray

//读取数组中某个key所对应的所有值
print(array.valueForKey("text"))

//读取第一个元素
print(array[0])

//读取第一个元素的key对应的值
let text = array[0].valueForKey("text")
print(text)

//在使用if let语句的时候，swift会自动进行拆包
if let state = array[0].objectForKey("state") {
print(state)
}

(
{
id = 1;
state = closed;
text = "Node 1";
},
{
id = 2;
state = open;
text = "Node 2";
},
{
id = 3;
state = open;
text = "Node 3";
},
{
id = 4;
state = open;
text = "Node 4";
}
)
(
"Node 1",
"Node 2",
"Node 3",
"Node 4"
)
{
id = 1;
state = closed;
text = "Node 1";
}
Optional(Node 1)
closed