swift – 对Enum的成员’init(from :)’的模糊引用

enum NumberEnumSpecial: Int32 {
    case two = 2,three = 3
}

我想用Int32初始化它,所以我用它：

let myEnum = NumberEnumSpecial.init(rawValue: 2)

这适用于游乐场项目,但不适用于我的常规App项目.我收到此错误的完全相同的代码：

Ambiguous reference to member 'init(from:)'

/Users/sjoerd/GitHub/flitsmeister-ios/app/Flitsmeister7/Model/Melding/DangerZone.swift:91:22: error: ambiguous reference to member 'init(from:)'
        let myEnum = NumberEnumSpecial.init(rawValue: 2)
                     ^~~~~~~~~~~~~~~~~
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^
Swift.RawRepresentable:2:24: note: found this candidate
    public convenience init(from decoder: Decoder) throws
                       ^



Build failed    13/10/2017,09:32

点击候选人没有任何效果.

如果你问我,代码中的某个Enum似乎有一个init(from)实现在我的枚举上导致这个错误.但是搜索这个文本没有给我带来任何结果.

这个错误是什么？如何找出造成这种情况的原因？

使用Swift 3.2和XCode9.0

目前解决方法：

enum NumberEnumSpecial: Int32 {
    case two = 2,three = 3

    init?(withSpecialNumber number : Int32) {
          self.init(rawValue: number)
    }
}