枚舉不工作，預計聲明

Question

我是新來的迅速和想使用enumeration：

enum students : String { 
     case Joseph = "Joseph", Matt = "Matt", Cody = "Cody", Rick = "Rick" 

     static let allValues = [Joseph, Matt, Cody, Rick] 

     for Joseph in students.allValues{ 
     studentPic.image = UIImage(named: "joseph.gif") 
     studentLabel.alpha = 1 
     studentLabel.text = "Joseph is an A+ student" 
     } 
     for Matt in students.allValues{ 
     studentPic.image = UIImage(named: "matt.gif") 
     studentLabel.alpha = 1 
     studentLabel.text = "Matt is a B+ student" 
     } 
     for Cody in students.allValues{ 
     studentPic.image = UIImage(named: "cody.gif") 
     studentLabel.alpha = 1 
     studentLabel.text = "Cody is a C+ student" 
     } 
     for Rick in students.allValues{ 
     studentPic.image = UIImage(named: "rick.gif") 
     studentLabel.alpha = 1 
     studentLabel.text = "Rick is a D+ student" 
     } 

    } 

我得到「Expected declaration」的第一行：

for Joseph in students.allValues 

有誰知道爲什麼？

Answer 1

你已經把任意代碼放在enum的主體中 - 這是行不通的。您需要func聲明或變量聲明（儘管如果它們是存儲屬性，則可能不在enum中）。修復您的代碼：

enum students : String { 
    case Joseph = "Joseph", Matt = "Matt", Cody = "Cody", Rick = "Rick" 

    static let allValues = [Joseph, Matt, Cody, Rick] 

    func doSomething() { 
     for Joseph in students.allValues{ 
     studentPic.image = UIImage(named: "joseph.gif") 
     studentLabel.alpha = 1 
     studentLabel.text = "Joseph is an A+ student" 
     } 
     // ... 
    } 
    } 

Answer 2

我在將現有objC代碼遷移到swift時遇到同樣的問題。

我必須要解決的是將包含枚舉的類（在我的情況下是`Constants.h）導入橋接頭。

希望它可以幫助別人。