如何将字典数组转换为JSON？

一种简单的实现方法是扩展CollectionType。

使用可选的绑定和向下转换，然后序列化为数据，然后转换为字符串。

extension CollectionType where Generator.Element == [String:AnyObject] {    func toJSonString(options: NSJSonWritingOptions = .PrettyPrinted) -> String {        if let arr = self as? [[String:AnyObject]], let dat = try? NSJSONSerialization.dataWithJSonObject(arr, options: options), let str = String(data: dat, encoding: NSUTF8StringEncoding) { return str        }        return "[]"    }}let arrayOfDictionaries: [[String:AnyObject]] = [    ["abc":123, "def": "ggg", "xyz": true],    ["abc":456, "def": "hhh", "xyz": false]]print(arrayOfDictionaries.toJSonString())

输出：

[  {    "abc" : 123,    "def" : "ggg",    "xyz" : true  },  {    "abc" : 456,    "def" : "hhh",    "xyz" : false  }]