swift3.0 类型转换

任意对象 anyObject转换为json对象

let parms = ["name":"liu","age":3,"height":170]
let data = try? JSONSerialization.data(withJSONObject: parms, options: JSONSerialization.WritingOptions.prettyPrinted)
let strJson = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("\(strJson)")

任意对象转换为String类型

String(describing:anyObject)

let str = "\(anyObject)"

String类型转Int类型

Int(string)