将Int型转换为enum:Int型

I am very new to Swift (got started this week) and I'm migrating my app from Objective-C. I have basically the following code in Objective-C that works fine:

我对Swift非常陌生(这周刚开始)，我正在将我的应用从Objective-C中迁移。我在Objective-C中有如下代码

typedef enum : int {
    MyTimeFilter1Hour = 1,
    MyTimeFilter1Day = 2,
    MyTimeFilter7Day = 3,
    MyTimeFilter1Month = 4,
} MyTimeFilter;

...

- (void)selectFilter:(id)sender
{
    self.timeFilterSelected = (MyTimeFilter)((UIButton *)sender).tag;
    [self closeAnimated:YES];
}

When translating it to Swift, I did the following:

翻译给Swift的时候，我做了如下:

enum MyTimeFilter : Int {
    case OneHour = 1
    case OneDay = 2
    case SevenDays = 3
    case OneMonth = 4
}

...

@IBAction func selectFilter(sender: AnyObject) {
    self.timeFilterSelected = (sender as UIButton).tag as MyTimeFilter
    self.close(true)
}

By doing that, I get the error :

通过这样做，我得到了一个错误:

'Int' is not convertible to 'MyTimeFilter'

'Int'不能转换为'MyTimeFilter'

I don't know if my approach (using the tag property) is the best, but anyway I need to do this kind of casting in different places in my app. Does anyone have an idea of how to get rid of this error?

我不知道我的方法(使用标签属性)是最好的，但是无论如何，我需要在我的应用程序中的不同地方进行这种类型的转换。有人知道如何处理这个错误吗?

Thanks!

谢谢!

2 个解决方案

#1

190

Use the rawValue initializer: it's an initializer automatically generated for enums.

使用rawValue初始化器:它是为枚举自动生成的初始化器。

self.timeFilterSelected = MyTimeFilter(rawValue: (sender as UIButton).tag)!

see: The Swift Programming Language § Enumerations

看:快速编程语言§枚举

NOTE: This answer has changed. Earlier version of Swift use the class method fromRaw() to convert raw values to enumerated values.

注意:这个答案已经改变。Swift的早期版本使用class方法fromRaw()将原始值转换为枚举值。

#2

Use of Enum for comparison like below :

使用Enum进行比较如下:

enum LoanType: Int {
    case FHA , VA, CONS, CASH
}
var loanType = LoanType.FHA

Comparison:

比较:

if loanType == .FHA
     {
      print("FHA")
     }

To change value :

改变值:

loanType = .CASH

#1

190