Swift:类中可选字典的变量:在输出中显示括号

Question

我想在类中创建一个可选的字典变量，这样当我创建一个实例时，我就不必添加该参数...

例子

class Stuff {
     var dictionary: [String: Double]?
     init(dictionary: [String:Double]?=["":0]){
}
}
var instance1    = Stuff(dictionary:["length":1.5])
var array: [Stuff] = [instance1, instance2]

let arraySet = (array[indexPath.row])
let X = arraySet.dictionary!

cell.Label.text = "\(X)"

这有效，但是当我将它分配给 cell.label.text 时，输出显示括号...

“[长度:1.5]”

我怎样才能去掉括号？？？

Answer 1

去除括号非常复杂，因为必须从字典中提取键/值对:

class Stuff {
  var dictionary: [String: Double]?
  init(dictionary: [String:Double]?=["":0.0]){
    self.dictionary = dictionary
  }
}


 let instance = Stuff(dictionary:["length":1.5])
 if let dict = instance.dictionary where dict.count > 0 {
   let key = dict.keys.first!
   let value = dict[key]!
   label.text = "\(key) : \(value)"
 }

如果您使用非可选文字创建字典，请考虑将变量 dictionary 声明为非可选