嵌套字典奇怪的行为

Question

我想使地图数据

代码：

class figures { 
    var maps : [NSDictionary] 
    init() { 
     self.maps = [ 
      [ 
       "map" : [ 
        [ "x" : -0.5, "y" : -0.5] 
       ], 
       "color" : UIColor.redColor() 
      ], 
      [ 
       "map" : [ 
        [ "x" : 0, "y" : 0], [ "x" : 0, "y" : -1], [ "x" : -1, "y" : 0], [ "x" : -1, "y" : -1] 
       ], 
       "color" : UIColor.blueColor() 
      ], 
      [ 
       "map" : [ 
        [ "x" : 0, "y" : -0.5], [ "x" : -1, "y" : -0.5] 
       ], 
       "color" : UIColor.yellowColor() 
      ] 
     ] 
    } 
} 

这段代码是有效的，但我想这本词典添加1个数字，如：

 [ 
      "map" : [ 
       [ "x" : -1, "y" : -0.5], [ "x" : 0.5, "y" : -0.5], [ "x" : -0.5, "y" : -0.5] 
      ], 
      "color" : UIColor.cyanColor() 
     ] 

，现在我得到了以下错误：

Could not find an overload for '-' that accepts the supplied arguments 

但如果在最后的dict 0.5 -0.5替换为X它再次有效

[ 
      "map" : [ 
       [ "x" : -1, "y" : -0.5], [ "x" : 0.5, "y" : -0.5], [ "x" : 0.5, "y" : -0.5] 
      ], 
      "color" : UIColor.cyanColor() 
     ] 

发生了什么事？任何人帮助

Answer 1

大型陈述这样一个迅速编译器已知问题。更好地构建您的阵列：

self.maps.append([ 
    "map" : [ 
       [ "x" : -0.5, "y" : -0.5] 
      ], 
      "color" : UIColor.redColor() 
]) 

self.maps.append([ 
    "map" : [ 
       [ "x" : 0, "y" : 0], [ "x" : 0, "y" : -1], [ "x" : -1, "y" : 0], [ "x" : -1, "y" : -1] 
      ], 
      "color" : UIColor.blueColor() 
]) 

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