Swift - 使用字典 - 添加多个值 [英] Swift - Working with Dictionaries - Add multiple values
问题描述
我一直在寻找这个问题的答案，但不幸的是没有成功。
我正在开发一个数学应用程序
（我需要使用解析器在NSView上绘制函数）
数据结构保存到词典，但我无法
字典是初始化 strong> like：
var functions = [String：[[String：NSBezierPath]，[String：NSColor]，[String： CGFloat]，[String：Bool]]]（）;
//1A。主字典的字符串键是函数的值，例如sin（x）
//1B。Dictionary的值是一个`Array` od`字典`
//2.第一个值是一个字典，其关键是一个字符串和值NSBezierPath（）
//3.第二个值是一个字典，其关键是一个字符串和值NSColor（）
//4。第三个值是一个字典，其关键是一个字符串和值CGFloat（）
//5第一个值是一个字典，其关键是字符串和值Bool（）
要添加函数，方法（我将报告一部分）：
...
//构建子-dictionaries
let path：[String：NSBezierPath] = [path：thePath];
let color：[String：NSColor] = [color：theColor];
let line：[String：CGFloat] = [lineWidth：theLine];
let visible：[String：Bool] = [visible：theVisibility];
//注意，我100％确保相对值与相对类型兼容。
//因此我很肯定有一个语法错误。
//添加元素（注意：函数是一个字符串，我希望它是Dictionary的键）
functions [theFunction ] = [path，color，line，visible]; // Error here
...
错误：：
'@ | value $ T10'不等于'（String，[ [String：NSbezierPath]，[String：NSColor]，[String：CGFloat]，[String：Bool]）]）'
b $ b
我希望这个问题足够清楚和完整。
如果我会立即添加您需要的任何类型的信息。
$词典从特定键类型映射到特定值类型。例如，您可以将您的键类型 String 和您的值类型 Int 。
在你的情况下，你已经声明了一个奇怪的字典：从 String s（足够好）映射到一个4元组4个不同的字典类型（每个字符串到不同类型）。
（这是一个新的字典类型，但它看起来像这样：
var thingy = [String，String]（）
$ b b
是这样的缩写：
var thingy = [（String，String）] b $ b Huh。奇怪，但它的工作原理你的字典正在使用这个伎俩的变体）
这意味着你的赋值工作你需要创建一个4元组的数组（注意额外的括号）：
functions [theFunction] = [（path，color，line，visible）]
我猜你不是要这样做。你真的想要这4种不同的字典类型的数组吗？如果是这样，你运气不好 - 你不能在同一个数组中存储不同的类型（字典有不同类型的值）。
（嗯，如果你创建字典的值 Any - 但这是一个可怕的想法，是噩梦使用）
可能你想要的结果是这样的（即从字符串中创建函数字典映射不同类型的字典的4元组）：
var functions = [String：（[String：NSBezierPath] String：NSColor]，[String：CGFloat]，[String：Bool]）]（）
'd给这样的字典赋值（注意，rhs上没有方括号）：
functions [theFunction] =路径，颜色，线，可见）
这将工作，但是会很不愉快。但你真的想把结构化数据存储在字典和数组中吗？这不是JavaScript ;-)你会绑定在多层次字典中的节点。声明结构体！这将是更容易在你的代码中使用。
struct函数{
var beziers：[String：NSBezierPath]
var color：[String：NSColor ]
var line：[String：NSColor]
var float：[String：CGFloat]
var bools：[String：Bool]
}
var functions： String：Functions] = [：]
更好的是，如果所有的bezier，是具有相同键的引用，声明包含所有它们或类似的字典。
I've been looking for answers to this problem, but unfortunately without success.
I'm developing a mathematical app (Swift-based), which keeps data of every function the user enters.
(I then need to draw the functions on an NSView using a Parser)
The data structure is saved into a Dictionary but I'm not able to add values and keys.
The Dictionary is initialized like:
var functions = [String : [[String : NSBezierPath], [String : NSColor], [String : CGFloat], [String : Bool]]]();
//1A.The String key of the main Dictionary is the value of the function, such as "sin(x)"
//1B.The value of the `Dictionary` is an `Array` od `Dictionaries`
//2.The first value is a dictionary, whose key is a String and value NSBezierPath()
//3.The second value is a dictionary, whose key is a String and value NSColor()
//4.The third value is a dictionary, whose key is a String and value CGFloat()
//5.The first value is a dictionary, whose key is a String and value Bool()
To add the functions, I have implemented a method (I will report a part of) :
...
//Build the sub-dictionaries
let path : [String:NSBezierPath] = ["path" : thePath];
let color : [String:NSColor] = ["color" : theColor];
let line : [String:CGFloat] = ["lineWidth" : theLine];
let visible : [String:Bool] = ["visible" : theVisibility];
//Note that I'm 100% sure that the relative values are compatible with the relative types.
//Therefore I'm pretty sure there is a syntax error.
//Add the element (note: theFunction is a string, and I want it to be the key of the `Dictionary`)
functions[theFunction] = [path, color, line, visible]; //Error here
...
I'm given the following error:
'@|value $T10' is not identical to '(String,[([String:NSbezierPath],[String : NSColor],[String : CGFloat],[String : Bool])])'
I hope the question was enough clear and complete.
In case I will immediately add any kind of information you will need.
Best regards and happy holidays.
Dictionaries map from a specific key type to a specific value type. For example, you could make your key type String and your value type Int.
In your case, you’ve declared quite a strange dictionary: a mapping from Strings (fair enough), to an array of 4-tuples of 4 different dictionary types (each one from strings to a different type).
(It’s a new one on me, but it looks like this:
var thingy = [String,String]()
is shorthand for this:
var thingy = [(String,String)]()
Huh. Strange but it works. Your dictionary is using a variant of this trick)
This means to make your assignment work you need to create an array of a 4-tuple (note additional brackets):
functions[theFunction] = [(path, color, line, visible)]
I’m guessing you didn’t mean to do this though. Did you actually want an array of these 4 different dictionary types? If so, you’re out of luck – you can’t store different types (dictionaries that have different types for their values) in the same array.
(Well, you could if you made the values of the dictionary Any – but that’s a terrible idea and would be nightmare to use)
Probably the result you wanted was this (i.e. make the functions dictionary map from a string to a 4-tuple of dictionaries of different types):
var functions = [String : ([String : NSBezierPath], [String : NSColor], [String : CGFloat], [String : Bool])]()
You’d assign values to the dictionary like this (note, no square brackets on the rhs):
functions[theFunction] = (path, color, line, visible)
This will work but it will be pretty unpleasant to work with. But do you really want to store your structured data in dictionaries and arrays? This isn’t JavaScript ;-) You’ll tie yourself in knots navigating that multi-level dictionary. Declare a struct! It’ll be so much easier to work with in your code.
struct Functions {
var beziers: [String:NSBezierPath]
var color: [String:NSColor]
var line: [String:NSColor]
var floats: [String:CGFloat]
var bools: [String:Bool]
}
var functions: [String:Functions] = [:]
Even better, if all the beziers, colors etc are supposed to be references with the same key, declare a dictionary that contains all of them or similar.
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