swift – Enum不在自定义初始化程序中工作

我在类初始值设定项(名为Building的类)中使用名为BuildingType的枚举变量.

这个枚举是在课外定义的,因为我也想在其他地方使用它.

初始化变量typeOfBuilding时,此枚举的自动完成功能无法正常工作.

示例代码：

enum BuildingType {
    case Flat,House,Villa
}

class Building {
    var type : BuildingType = BuildingType.House
    var floors : Int = 1

    init(typeOfBuilding : BuildingType,numFloors : Int) {
        self.type = typeOfBuilding
        self.floors = numFloors
    }
}

var myBuilding : Building = Building(typeOfBuilding: BuildingType.Flat,numFloors: 3)

所以,如果我输入“… typeOfBuilding：BuildingType”. (初始化myBuilding时)会显示“floor”和“type”,而不是枚举值.

我一定是在做错事但是什么？

解决方法

这是一个非常奇怪的错误

当您尝试将枚举传递给初始化器的参数时,它会发生,自动完成将失败,而不是在键入枚举后建议枚举案例.它将列出您正在调用初始化器的类的实例成员.如果您尝试使用单点语法(.Case),自动完成也将失败,但它不会显示实例成员列表,而是显示任何内容.

我最初认为它可能与你的枚举和类(BuildingType& Building)的命名有关,但事实并非如此.

此错误似乎只出现在具有多个参数的初始化程序中(其中一个是枚举).我无法使用单个参数初始化器重现此问题.

重现性似乎取决于初始化器是否“完整”.我正在考虑将初始化器设置为“完整”,如果它具有定义的所有参数名称和值(枚举除外).例如：

// Incomplete (foo is one argument of many)
let baz = Baz(foo: Foo.

// Semi-Complete (before you assign the second parameter a value)
let baz = Baz(foo: Foo.,string: <String Placeholder>)

// Complete
let baz = Baz(foo: Foo.,string: "")

// Complete (note the lack of the last bracket)
let baz = Baz(param: 0,foo: Foo.

这是我的测试设置(Xcode 7.3,Swift 2.2)：

enum Foo {
    case Bar
}

class Baz {
    var iReallyShouldntBedisplayedHere = 0
    init(foo:Foo,string:String) {}
    init(foo: Foo) {}
}

这里列出了我发现错误的情况.不会发生：

// Enum is the only argument

// CORRECT: accepting the initialiser's autocomplete (so it's 'complete'),then typing "Foo." brings up autocomplete options for enum cases
let baz = Baz(foo: Foo.)

// CORRECT: typing the initialiser yourself (so it's 'incomplete'),then typing "Foo." in the first parameter brings up autocomplete options for enum cases
let baz2 = Baz(foo: Foo.


// Enum is one argument of many

// INCORRECT: accepting the initialiser's autocomplete (so it's 'semi-complete'),then typing "Foo." in the first parameter brings up Baz's instance members ("iReallyShouldntBedisplayedHere")
let baz3 = Baz(foo: Foo.,string: <String Placeholder>)

// CORRECT: typing the initialiser yourself (so it's 'incomplete'),and typing "Foo." in the first parameter brings up enum cases
let baz4 = Baz(foo: Foo.


// Single dot Syntax (where enum is one argument of many)

// CORRECT: typing the initialiser yourself (so it's 'incomplete'),and typing "." in the first parameter brings up enum cases
let baz5 = Baz(foo:.

// CORRECT: accepting the initialiser's autocomplete (so it's 'semi-complete'),then typing "." in the first parameter brings up enum cases
let baz6 = Baz(foo:.,string: <String Placeholder>)

// INCORRECT: modifying the foo: argument once the initialiser is 'complete' by typing "." in the first parameter doesn't generate the autocomplete list
let baz7 = Baz(foo:.,string: "")

我也试过这个,其中foo：是最后一个参数,但初始化器必须在这种情况下完成,所以它总是失败.我尝试使用带有3个参数的初始化程序,但它似乎与具有2个参数的初始化程序具有相同的行为.

如果有人知道可以再现这个bug的更多案例,我很想知道！