我正在尝试制作一个非常简单的字典，将字符串映射到Swift中的字符串数组。代码如下所示:classFirstViewController:UIViewController{varcharacters:[String]=[]varadjacency=[String:[String]?]()overridefuncviewDidLoad(){super.viewDidLoad()characters=loadCharacters()adjacency=loadAdjacency()varcharacter:String=characters[0]varadj:[String]=adjace

根据Dictionary上的标题文档在Swift中:Ahash-basedmappingfromKeytoValueinstances.Alsoacollectionofkey-valuepairswithnodefinedordering.特别注意-nodefinedordering.考虑到这一点，我无法完全理解这些计算变量(以及采用这些类型的相关方法)://Thepositionofthefirstelementinanon-emptydictionary.varstartIndex:DictionaryIndex{get}//Thecollection's"pasttheend"

当我从Xcode6beta4切换到beta5时，我在引用我的plays变量时遇到此错误(Int不可转换为“DictionaryIndex”)。我不知道如何解决这个问题。这是代码块:varplays=Dictionary()vardone=falsevaraiDeciding=false//FunctionthatsayswhattodoifaUIButtonisclicked:@IBActionfuncUIbuttonClicked(sender:UIButton){if!plays[sender.tag]&&!aiDeciding&&!done{setImgforCircle(sen