嵌套字典奇怪的行爲

Question

我想使地圖數據

代碼：

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() 
      ] 
     ] 
    } 
} 

這段代碼是有效的，但我想這本詞典添加1個數字，如：

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

，現在我得到了以下錯誤：

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

但如果在最後的dict 0.5 -0.5替換爲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() 
     ] 

發生了什麼事？任何人幫助

Answer 1

大型陳述這樣一個迅速編譯器已知問題。更好地構建您的陣列：

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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